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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net Income $ 10,234 $ 9,616 [1] $ 20,310 $ 18,262
Net change in unrealized gains (losses) on available-for-sale securities:        
Net change in unrealized gains on available-for-sale securities, net of tax of ($1,173), ($1,821), ($926) and ($6,004), respectively 2,178 3,382 1,720 11,151
Net reclassification adjustment for gains included in net income, net of tax of $0, $1, $0 and $1, respectively(1) 0 (3) 0 (3)
Net change in unrealized gains on available-for-sale securities, net of tax 2,178 3,379 1,720 11,148
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]        
Net change in unrealized losses on cash flow hedging derivatives, net of tax of $249, $705, $200 and $1,966, respectively (462) (1,309) (372) (3,652)
Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, net of tax of ($145), ($218), ($304) and ($345), respectively(2) 268 404 564 642
Net change in unrealized (losses) gains on cash flow hedging derivatives, net of tax (194) (905) 192 (3,010)
Reclassification of amortization of net unrecognized actuarial loss and prior service cost, net of tax of ($23), ($21), ($46) and ($42), respectively(3) 43 38 86 76
Other comprehensive income 2,027 2,512 1,998 8,214
Comprehensive Income $ 12,261 $ 12,128 $ 22,308 $ 26,476
[1] Share and per share amounts for the three and six months ended June 30, 2016 have been adjusted to reflect the three-for-two stock split effective September 30, 2016.