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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, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Long-term debt |  | $ 171,577,000 | $ 186,327,000
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) |  | 2.70% | 2.24%
Long-term debt |  | $ 25,000,000 | $ 40,000,000
LIBOR | Term loan |  |  |
Debt Instrument [Line Items] |  |  |
Stated Interest Rate, basis spread (as a percent) | 1.50% |  |

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