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Supplemental Comprehensive Income Disclosures Supplemental Comprehensive Income Disclosures (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income [Line Items]      
Balance at beginning of period $ (7,027) $ (2,386) $ (4,499)
Other comprehensive income before reclassification adjustment 3,979 (4,409) 2,112
Amounts reclassified from accumulated other comprehensive income (loss) (3,199) (447) 67
Net gain 74 215 (66)
Net other comprehensive income during the period 854 (4,641) 2,113
Balance at end of period (6,173) (7,027) (2,386)
Securities Available for Sale      
Accumulated Other Comprehensive Income [Line Items]      
Balance at beginning of period (7,455) (2,956) (4,875)
Other comprehensive income before reclassification adjustment 4,565 (4,098) 1,820
Amounts reclassified from accumulated other comprehensive income (loss) (3,276) (401) 99
Net other comprehensive income during the period 1,289 (4,499) 1,919
Balance at end of period (6,166) (7,455) (2,956)
Derivatives      
Accumulated Other Comprehensive Income [Line Items]      
Balance at beginning of period 203 560 300
Other comprehensive income before reclassification adjustment (586) (311) 292
Amounts reclassified from accumulated other comprehensive income (loss) 77 (46) (32)
Net other comprehensive income during the period (509) (357) 260
Balance at end of period (306) 203 560
Post-Retirement Obligation      
Accumulated Other Comprehensive Income [Line Items]      
Balance at beginning of period 225 10 76
Net gain 74 215 (66)
Net other comprehensive income during the period 74 215 (66)
Balance at end of period $ 299 $ 225 $ 10