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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive income (loss), pre-tax | $ 12,230 | $ 2,788 | $ 21,092 | $ 5,326
Total other comprehensive income (loss), tax expense (benefit) | 4,728 | 1,078 | 8,154 | 2,049
Other comprehensive income, net of tax | 7,502 | 1,710 | 12,938 | 3,277
Securities available for sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (1,245) | 2,258 | 7,682 | 8,573
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (481) | 873 | 2,970 | 3,313
Other comprehensive income (loss), before reclassifications, net of tax | (764) | 1,385 | 4,712 | 5,260
Total other comprehensive income (loss), pre-tax | 11,966 | 2,240 | 20,618 | 7,308
Total other comprehensive income (loss), tax expense (benefit) | 4,626 | 866 | 7,971 | 2,825
Other comprehensive income, net of tax | 7,340 | 1,374 | 12,647 | 4,483
Unrealized holding gains on securities transfered from held to maturity to available for sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 13,218 |  | 13,218 |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 5,110 |  | 5,110 |
Other comprehensive income (loss), before reclassifications, net of tax | 8,108 |  | 8,108 |
Securities available for sale, amortization of gains transferred to held to maturity |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax | (7) | (18) | (282) | (79)
Reclassification from AOCI, tax expense (benefit) | (3) | (7) | (109) | (30)
Reclassification from AOCI, net of tax | (4) | (11) | (173) | (49)
Derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 163 | 807 | 169 | (1,959)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 63 | 312 | 65 | (760)
Other comprehensive income (loss), before reclassifications, net of tax | 100 | 495 | 104 | (1,199)
Total other comprehensive income (loss), pre-tax | 163 | 807 | 169 | (1,959)
Total other comprehensive income (loss), tax expense (benefit) | 63 | 312 | 65 | (760)
Other comprehensive income, net of tax | 100 | 495 | 104 | (1,199)
Securities available for sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax |  |  |  | (1,186)
Reclassification from AOCI, tax expense (benefit) |  |  |  | (458)
Reclassification from AOCI, net of tax |  |  |  | (728)
Defined benefit Pension and Post-Retirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive income (loss), pre-tax | 101 | (259) | 305 | (23)
Total other comprehensive income (loss), tax expense (benefit) | 39 | (100) | 118 | (16)
Other comprehensive income, net of tax | 62 | (159) | 187 | (7)
Net settlement gain (loss) attributable to parent |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax |  | (383) |  | (383)
Reclassification from AOCI, tax expense (benefit) |  | (148) |  | (148)
Reclassification from AOCI, net of tax |  | (235) |  | (235)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax | 101 | 124 | 305 | 360
Reclassification from AOCI, tax expense (benefit) | 39 | 48 | 118 | 132
Reclassification from AOCI, net of tax | $ 62 | $ 76 | $ 187 | $ 228

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