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Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Gross rental expense $ 3,730    
Liability for repurchases   $ 330 $ 290
Operating lease right of use assets   23,825 24,147
Operating Lease, Right-of-Use Asset, Corporate Office Building     14,650
Operating lease liabilities   $ 23,688 24,319
Operating Lease, Liability, Corporate Office Building     $ 14,640
Operating Lease, Liability, Statement of Financial Position [Extensible List]   us-gaap:OtherLiabilities us-gaap:OtherLiabilities