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Securities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
security
item
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
security
item
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Trading, and Equity Securities, FV-NI, Total           $ 0 $ 0
Number of securities in portfolio | security   3   3      
Number of portfolio securities modeled structured | security   2   2      
Accrued interest receivable on held-to-maturity securities   $ 100   $ 100      
Allowance for credit loss   0   0      
Accrued interest receivable on available-for-sale debt securities   1,400   1,400      
Proceeds from Sale of Debt Securities, Available-for-sale   $ 0 $ 0 $ 130,800 $ 26,400    
Held-to-maturity Securities [Member]              
Number of active forbearances | item   1   1      
Outstanding balance in active forbearance   $ 20,900   $ 20,900      
Collateralized Mortgage Obligations by Commercial Real Estate [Member]              
Private Issue Collateralized Mortgage Obligations, Number           0 0
Accounting Standards Update 2016-13 [Member]              
Increase in allowance for held-to-maturity debt securities $ 300