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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