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Other Comprehensive Income - Changes in Components of OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | $ 25,029 | $ (9,908) | $ 11,832
Total other comprehensive income (loss), tax expense (benefit) | 6,369 | (2,523) | 4,393
Other comprehensive income (loss), net of tax | 18,660 | (7,385) | 7,439
Total securities available for sale |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 24,983 |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 6,358 |  |
Other comprehensive income (loss), before reclassifications, net of tax | 18,625 |  |
Reclassification from AOCI, pre-tax | 2,511 |  |
Reclassification from AOCI, tax expense (benefit) | 639 |  |
Reclassification from AOCI, net of tax | 1,872 |  |
Total other comprehensive income (loss), pre-tax | 27,494 | (11,139) | 9,172
Total other comprehensive income (loss), tax expense (benefit) | 6,997 | (2,836) | 3,546
Other comprehensive income (loss), net of tax | 20,497 | (8,303) | 5,626
Total derivative instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (2,975) | 490 | 874
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (758) | 125 | 338
Other comprehensive income (loss), before reclassifications, net of tax | (2,217) | 365 | 536
Total other comprehensive income (loss), pre-tax | (2,975) | 490 | 874
Total other comprehensive income (loss), tax expense (benefit) | (758) | 125 | 338
Other comprehensive income (loss), net of tax | (2,217) | 365 | 536
Net gain arising during the period |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 91 | 413 | 1,379
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 23 | 105 | 351
Other comprehensive income (loss), before reclassifications, net of tax | 68 | 308 | 1,028
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 419 | 328 | 407
Reclassification from AOCI, tax expense (benefit) | 107 | 83 | 158
Reclassification from AOCI, net of tax | 312 | 245 | 249
Total defined benefit pension and post-retirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | 510 | 741 | 1,786
Total other comprehensive income (loss), tax expense (benefit) | 130 | 188 | 509
Other comprehensive income (loss), net of tax | $ 380 | 553 | 1,277
Unrealized holding losses on securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax |  | (11,155) | (3,617)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) |  | (2,840) | (1,399)
Other comprehensive income (loss), before reclassifications, net of tax |  | (8,315) | (2,218)
Unrealized holding gains on securities transferred from held to maturity to available for sale |  |  |
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
Reclassification adjustment for gains realized in net income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  | 16 | (148)
Reclassification from AOCI, tax expense (benefit) |  | 4 | (57)
Reclassification from AOCI, net of tax |  | $ 12 | (91)
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)
Reclassification from AOCI, tax expense (benefit) |  |  | (109)
Reclassification from AOCI, net of tax |  |  | $ (173)

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