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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | $ 11,832 | $ (10,400) | $ (3,226)
Total other comprehensive income (loss), tax expense (benefit) | 4,393 | (4,031) | (1,289)
Other comprehensive income (loss), net of tax | 7,439 | (6,369) | (1,937)
Securities Available for Sale |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (3,617) | (10,119) | (571)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (1,399) | (3,913) | (220)
Other comprehensive income (loss), before reclassifications, net of tax | (2,218) | (6,206) | (351)
Reclassification from AOCI, pre-tax | (148) | (1,186) | (96)
Reclassification from AOCI, tax expense (benefit) | (57) | (459) | (37)
Reclassification from AOCI, net of tax | (91) | (727) | (59)
Total other comprehensive income (loss), pre-tax | 9,172 | (11,404) | (845)
Total other comprehensive income (loss), tax expense (benefit) | 3,546 | (4,410) | (325)
Other comprehensive income (loss), net of tax | 5,626 | (6,994) | (520)
Accumulated Net Investment Gain (Loss) Attributable to Parent, Securities Transferred from Held to Maturity to Available for Sale [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 13,219 |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 5,111 |  |
Other comprehensive income (loss), before reclassifications, net of tax | 8,108 |  |
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 | (282) | (99) | (178)
Reclassification from AOCI, tax expense (benefit) | (109) | (38) | (68)
Reclassification from AOCI, net of tax | (173) | (61) | (110)
Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 874 | 856 | (420)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 338 | 329 | (171)
Other comprehensive income (loss), before reclassifications, net of tax | 536 | 527 | (249)
Total other comprehensive income (loss), pre-tax | 874 | 856 | (420)
Total other comprehensive income (loss), tax expense (benefit) | 338 | 329 | (171)
Other comprehensive income (loss), net of tax | 536 | 527 | (249)
Defined benefit Pension and Post-Retirement Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  | 480 |
Reclassification from AOCI, tax expense (benefit) |  | 178 |
Reclassification from AOCI, net of tax |  | 302 |
Total other comprehensive income (loss), pre-tax | 1,786 | 148 | (1,961)
Total other comprehensive income (loss), tax expense (benefit) | 509 | 50 | (793)
Other comprehensive income (loss), net of tax | 1,277 | 98 | (1,168)
Net gain (losses) arising during the period |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 1,379 | 51 | (2,393)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 351 | 20 | (958)
Other comprehensive income (loss), before reclassifications, net of tax | 1,028 | 31 | (1,435)
Reclassification of adjustment for net settlement gain realized in net income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  | (383) |
Reclassification from AOCI, tax expense (benefit) |  | (148) |
Reclassification from AOCI, net of tax |  | $ (235) |
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 407 |  | 432
Reclassification from AOCI, tax expense (benefit) | 158 |  | 165
Reclassification from AOCI, net of tax | $ 249 |  | $ 267

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