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Borrowed Funds and Mandatorily Redeemable Securities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
note
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Borrowed funds and mandatorily redeemable securities      
Total long-term debt and mandatorily redeemable securities $ 71,123 $ 70,060  
Annual maturities of long-term debt      
2019 2,565    
2020 2,460    
2021 2,748    
2022 4,410    
2023 1,630    
Thereafter 57,310    
Mandatorily redeemable securities      
Interest expense 1,610 1,680 $ 1,450
Securities subject to mandatory redemption      
Borrowed funds and mandatorily redeemable securities      
Mandatorily redeemable securities 16,542 18,948  
Federal Home Loan Bank borrowings      
Borrowed funds and mandatorily redeemable securities      
Long-term debt $ 46,444 47,114  
Annual maturities of long-term debt      
Number of Federal Home Loan Bank borrowings, fixed rate notes | note 17    
Collateral security $ 58,040    
Other long-term debt      
Borrowed funds and mandatorily redeemable securities      
Long-term debt $ 8,137 $ 3,998  
Minimum | Federal Home Loan Bank borrowings      
Borrowed funds and mandatorily redeemable securities      
Interest rate on Federal Home Loan Bank borrowings (as a percent) 1.04%    
Maximum | Federal Home Loan Bank borrowings      
Borrowed funds and mandatorily redeemable securities      
Interest rate on Federal Home Loan Bank borrowings (as a percent) 5.04%