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Securities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Trading, and Equity Securities, FV-NI, Total $ 0   $ 0   $ 0
Securities held-to-maturity, amortized cost 58,731   58,731    
Allowance for credit loss 0   0    
Accrued interest receivable on available-for-sale debt securities 1,600   1,600   1,300
Proceeds from Sale of Debt Securities, Available-for-sale $ 20,000 $ 0 $ 45,000 $ 130,800  
Held-to-maturity Securities          
Number of securities in portfolio | security 3   3    
Securities held-to-maturity, amortized cost $ 58,700   $ 58,700    
Outstanding balance in active forbearance 21,000   21,000    
Specific reserve for outstanding balance of financing receivable in active forbearance 600   600    
Accrued interest receivable on held-to-maturity securities 100   100   $ 100
Commercial Real Estate | Held-to-maturity Securities          
Securities held-to-maturity, amortized cost 29,900   29,900    
Allowance for credit loss $ 200   $ 200    
Collateralized Mortgage Obligations by Commercial Real Estate [Member]          
Private Issue Collateralized Mortgage Obligations, Number 0   0   0
FNMA | Held-to-maturity Securities          
Securities held-to-maturity, amortized cost $ 7,900   $ 7,900