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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | $ (10,400) | $ (3,226) | $ 7,085
Total other comprehensive income (loss), tax expense (benefit) | (4,031) | (1,289) | 2,710
Other comprehensive (loss) income, net of tax | (6,369) | (1,937) | 4,375
Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (10,119) | (571) | 12,520
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (3,913) | (220) | 4,789
Other comprehensive income (loss), before reclassifications, net of tax | (6,206) | (351) | 7,731
Reclassification from AOCI, pre-tax | (1,186) | (96) | (375)
Reclassification from AOCI, tax expense (benefit) | (459) | (37) | (143)
Reclassification from AOCI, net of tax | (727) | (59) | (232)
Total other comprehensive income (loss), pre-tax | (11,404) | (845) | 11,892
Total other comprehensive income (loss), tax expense (benefit) | (4,410) | (325) | 4,549
Other comprehensive (loss) income, net of tax | (6,994) | (520) | 7,343
Amortization of unrealized holding gains on securities transferred to the held to maturity category |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | (99) | (178) | (253)
Reclassification from AOCI, tax expense (benefit) | (38) | (68) | (97)
Reclassification from AOCI, net of tax | (61) | (110) | (156)
Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 856 | (420) | (2,627)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 329 | (171) | (1,005)
Other comprehensive income (loss), before reclassifications, net of tax | 527 | (249) | (1,622)
Total other comprehensive income (loss), pre-tax | 856 | (420) | (2,627)
Total other comprehensive income (loss), tax expense (benefit) | 329 | (171) | (1,005)
Other comprehensive (loss) income, net of tax | 527 | (249) | (1,622)
Defined benefit Pension and Post-Retirement Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | (383) | 432 |
Reclassification from AOCI, tax expense (benefit) | (148) | 165 |
Reclassification from AOCI, net of tax | (235) | 267 |
Total other comprehensive income (loss), pre-tax | 148 | (1,961) | (2,180)
Total other comprehensive income (loss), tax expense (benefit) | 50 | (793) | (834)
Other comprehensive (loss) income, net of tax | 98 | (1,168) | (1,346)
Net gain (losses) arising during the period |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 51 | (2,393) | (2,476)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 20 | (958) | (947)
Other comprehensive income (loss), before reclassifications, net of tax | 31 | $ (1,435) | (1,529)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 480 |  | 296
Reclassification from AOCI, tax expense (benefit) | 178 |  | 113
Reclassification from AOCI, net of tax | $ 302 |  | $ 183

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