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Federal Home Loan Bank Advances and Long-Term Debt (Term Loan) (Details) - USD ($)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Long-term debt   $ 146,835,000 $ 171,577,000
Term loan      
Debt Instrument [Line Items]      
Term loan, face amount $ 100,000,000    
Term 3 years    
Quarterly principal repayment $ 5,000,000    
Weighted-average rate (as a percent)   3.60% 2.70%
Long-term debt   $ 0 $ 25,000,000
LIBOR | Term loan      
Debt Instrument [Line Items]      
Stated Interest Rate, basis spread (as a percent) 1.50%    
Stated Interest Rate, base 3-month Libor +