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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