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Contingent Liabilities, Commitments, and Financial Instruments with Off-Balance-Sheet Risk (Details 2)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Rate
Dec. 31, 2019
USD ($)
Rate
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Operating lease cost $ 3,472 $ 3,487  
Short-term lease cost 8 41  
Variable lease cost (30) 0  
Total operating lease cost 3,450 3,528  
Operating Leases, Rent Expense, Net [Abstract]      
Gross rental expense     $ 3,730
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
2021 3,639    
2022 3,944    
2023 3,590    
2024 2,681    
2025 2,497    
Thereafter 9,194    
Total lease payments 25,545    
Imputed interest (1,857)    
Operating lease liabilities $ 23,688 $ 24,319  
Weighted average remaining lease term 10 years 2 months 1 day 10 years 10 months 17 days  
Weighted average discount rate | Rate 1.80% 2.83%  
Operating cash flows from operating leases $ 3,794 $ 3,768  
Net gain on sale of building with a subsequent operating lease   $ 1,310  
Number of significant lessee leases that have not yet commenced 0