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Other Comprehensive Income - (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | $ 4,882 | $ 3,082
Total other comprehensive income (loss), tax expense (benefit) | 1,888 | 1,189
Other comprehensive income, net of tax | 2,994 | 1,893
Securities Available for Sale |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 4,739 | 5,060
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 1,832 | 1,953
Other comprehensive income (loss), before reclassifications, net of tax | 2,907 | 3,107
Total other comprehensive income (loss), pre-tax | 4,493 | 5,027
Total other comprehensive income (loss), tax expense (benefit) | 1,737 | 1,940
Other comprehensive income, net of tax | 2,756 | 3,087
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 | (246) | (33)
Reclassification from AOCI, tax expense (benefit) | (95) | (13)
Reclassification from AOCI, net of tax | (151) | (20)
Derivative Instruments |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 276 | (2,062)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 107 | (796)
Other comprehensive income (loss), before reclassifications, net of tax | 169 | (1,266)
Total other comprehensive income (loss), pre-tax | 276 | (2,062)
Total other comprehensive income (loss), tax expense (benefit) | 107 | (796)
Other comprehensive income, net of tax | 169 | (1,266)
Defined benefit Pension and Post-Retirement Benefit Plans |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total other comprehensive income (loss), pre-tax | 113 | 117
Total other comprehensive income (loss), tax expense (benefit) | 44 | 45
Other comprehensive income, net of tax | 69 | 72
Amortization of net actuarial loss recognized in net periodic pension cost |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Reclassification from AOCI, pre-tax | 113 | 117
Reclassification from AOCI, tax expense (benefit) | 44 | 45
Reclassification from AOCI, net of tax | $ 69 | $ 72

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