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Other Comprehensive Income (Loss) - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | $ 10,677 |  | $ (3,429) |  | $ 24,690 | $ (12,800)
Total other comprehensive income (loss), tax expense (benefit) | 2,717 |  | (873) |  | 6,284 | (3,259)
Other comprehensive income (loss), net of tax | 7,960 | $ 10,446 | (2,556) | $ (6,985) | 18,406 | (9,541)
Securities available for sale |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 12,599 |  |  |  | 27,780 | (14,634)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 3,206 |  |  |  | 7,070 | (3,725)
Other comprehensive income (loss), before reclassifications, net of tax | 9,393 |  |  |  | 20,710 | (10,909)
Reclassification from AOCI, pre-tax | 8 |  |  |  | (5) |
Reclassification from AOCI, tax expense (benefit) | 2 |  |  |  | (1) |
Reclassification from AOCI, net of tax | 6 |  |  |  | (4) |
Total other comprehensive income (loss), pre-tax | 12,607 |  | (4,025) |  | 27,775 | (14,634)
Total other comprehensive income (loss), tax expense (benefit) | 3,208 |  | (1,025) |  | 7,069 | (3,725)
Other comprehensive income (loss), net of tax | 9,399 |  | (3,000) |  | 20,706 | (10,909)
Derivative Instruments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (2,067) |  |  |  | (3,294) |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (526) |  |  |  | (838) |
Other comprehensive income (loss), before reclassifications, net of tax | (1,541) |  |  |  | (2,456) |
Total other comprehensive income (loss), pre-tax | (2,067) |  |  |  | (3,294) |
Total other comprehensive income (loss), tax expense (benefit) | (526) |  |  |  | (838) |
Other comprehensive income (loss), net of tax | (1,541) |  |  |  | (2,456) |
Derivative instruments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  |  | 519 |  |  | 1,670
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  |  | 132 |  |  | 425
Other comprehensive income (loss), before reclassifications, net of tax |  |  | 387 |  |  | 1,245
Total other comprehensive income (loss), pre-tax |  |  | 519 |  |  | 1,670
Total other comprehensive income (loss), tax expense (benefit) |  |  | 132 |  |  | 425
Other comprehensive income (loss), net of tax |  |  | 387 |  |  | 1,245
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Reclassification from AOCI, pre-tax | 137 |  | 77 |  | 209 | 164
Reclassification from AOCI, tax expense (benefit) | 35 |  | 20 |  | 53 | 41
Reclassification from AOCI, net of tax | 102 |  | 57 |  | 156 | 123
Defined benefit Pension and Post-Retirement Benefit Plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | 137 |  | 77 |  | 209 | 164
Total other comprehensive income (loss), tax expense (benefit) | 35 |  | 20 |  | 53 | 41
Other comprehensive income (loss), net of tax | $ 102 |  | 57 |  | $ 156 | $ 123
Unrealized holding losses on securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  |  | (4,025) |  |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  |  | (1,025) |  |  |
Other comprehensive income (loss), before reclassifications, net of tax |  |  | $ (3,000) |  |  |

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