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Other Comprehensive Income (Loss) - (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive income (loss), pre-tax | $ 3,980 | $ (544) | $ 8,862 | $ 2,538
Total other comprehensive income (loss), tax expense (benefit) | 1,538 | (218) | 3,426 | 971
Other comprehensive income (loss), net of tax | 2,442 | (326) | 5,436 | 1,567
Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 4,188 | 1,326 | 8,927 | 6,315
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 1,619 | 514 | 3,451 | 2,440
Other comprehensive income (loss), before reclassifications, net of tax | 2,569 | 812 | 5,476 | 3,875
Reclassification from AOCI, pre-tax | (29) |  |  |
Reclassification from AOCI, tax expense (benefit) | (11) |  |  |
Reclassification from AOCI, net of tax | (18) |  |  |
Total other comprehensive income (loss), pre-tax | 4,159 | 41 | 8,652 | 5,068
Total other comprehensive income (loss), tax expense (benefit) | 1,608 | 19 | 3,345 | 1,959
Other comprehensive income (loss), net of tax | 2,551 | 22 | 5,307 | 3,109
Securities available for sale, reclassification for gains |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax |  | (1,257) |  | (1,186)
Reclassification from AOCI, tax expense (benefit) |  | (485) |  | (458)
Reclassification from AOCI, net of tax |  | (772) |  | (728)
Securities available for sale, amortization of gains transferred to held to maturity |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax |  | (28) | (275) | (61)
Reclassification from AOCI, tax expense (benefit) |  | (10) | (106) | (23)
Reclassification from AOCI, net of tax |  | (18) | (169) | (38)
Derivative Instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (270) | (704) | 6 | (2,766)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (105) | (276) | 2 | (1,072)
Other comprehensive income (loss), before reclassifications, net of tax | (165) | (428) | 4 | (1,694)
Total other comprehensive income (loss), pre-tax | (270) | (704) | 6 | (2,766)
Total other comprehensive income (loss), tax expense (benefit) | (105) | (276) | 2 | (1,072)
Other comprehensive income (loss), net of tax | (165) | (428) | 4 | (1,694)
Defined benefit Pension and Post-Retirement Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total other comprehensive income (loss), pre-tax | 91 | 119 | 204 | 236
Total other comprehensive income (loss), tax expense (benefit) | 35 | 39 | 79 | 84
Other comprehensive income (loss), net of tax | 56 | 80 | 125 | 152
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, pre-tax | 91 | 119 | 204 | 236
Reclassification from AOCI, tax expense (benefit) | 35 | 39 | 79 | 84
Reclassification from AOCI, net of tax | $ 56 | $ 80 | $ 125 | $ 152

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