Annual report pursuant to Section 13 and 15(d)

Financing Arrangements - Additional Information (Details)

v3.21.1
Financing Arrangements - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Business
Aug. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 27, 2018
USD ($)
Umpqua Credit Agreement        
Debt Instrument [Line Items]        
Credit facility outstanding amount repayment date Sep. 27, 2022      
Credit facility interest rate description (1) a base rate, which fluctuates daily and is the greater of (a) the prime rate in effect as of any date of determination and (b) the daily LIBOR rate as of such date of determination plus 1.0% per annum, or (2) a LIBOR rate, which can be for a period of 30, 60 or 90 days at the Company’s option and is equal to the published rate in the Wall Street Journal for such 30-, 60- or 90-day period two business days prior to the commencement of such period, in each case plus 2.0% per annum.      
Credit facility covenant description Under the Umpqua Credit Agreement, the Company is subject to various negative covenants that limit, subject to certain exclusions, the Company’s ability to incur indebtedness, make loans, invest in or secure the obligations of other parties, pay or declare dividends, make distributions with respect to the Company’s securities, redeem outstanding shares of the Company’s stock, create subsidiaries, materially change the nature of its business, enter into related party transactions, engage in mergers and business combinations, the acquisition or transfer of Company assets outside of the ordinary course of business, grant liens or enter into collateral relationships involving company assets or reincorporate, reorganize or dissolve the Company.        
Credit facility borrowings outstanding $ 0   $ 0  
Umpqua Credit Agreement | LIBOR        
Debt Instrument [Line Items]        
Debt instrument basis spread 2.00%      
Period of interest rate option applied on credit facility 30 days      
Period of interest rate option applied on credit facility 60 days      
Period of interest rate option applied on credit facility 90 days      
Number of business days prior to commencement of periods on interest rate | Business 2      
Credit facility variable rate LIBOR      
Umpqua Credit Agreement | LIBOR | Fluctuating Rate Per Annum        
Debt Instrument [Line Items]        
Debt instrument basis spread 1.00%      
Revolving Facility        
Debt Instrument [Line Items]        
Credit facility maximum borrowing capacity under loan   $ 20,000,000.0    
Revolving Facility | Umpqua Credit Agreement        
Debt Instrument [Line Items]        
Credit agreement date Sep. 27, 2018      
Credit facility maximum borrowing capacity under loan       $ 10,000,000.0
Revolving Facility | Umpqua Credit Agreement | Maximum        
Debt Instrument [Line Items]        
Increase in credit facility total $ 25,000,000.0      
Letter of Credit Subfacility | Umpqua Credit Agreement        
Debt Instrument [Line Items]        
Credit facility maximum borrowing capacity under loan       $ 3,000,000.0