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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]        
Net income $ 28,121 $ 21,359 $ 54,107 $ 41,638
Securities available for sale:        
Unrealized net holding (losses) gains arising during the period, gross (5,353) 2,528 (20,807) 3,364
Tax effect 1,338 (966) 5,202 (1,305)
Unrealized net holding (losses) gains arising during the period, net (4,015) 1,562 (15,605) 2,059
Reclassification adjustment for net (gains) in net income, gross 0 (2) 0 (2)
Tax effect 0 1 0 1
Reclassification adjustment for net (gains) in net income, net 0 (1) 0 (1)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross 177 225 365 463
Tax effect (44) (86) (91) (177)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net 133 139 274 286
Reclassification adjustment for an impairment write-down of equity security, gross 0 0 0 1,312
Tax effect 0 0 0 (501)
Reclassification adjustment for an impairment write-down of equity security, net 0 0 0 811
Total securities available for sale, net (3,882) 1,700 (15,331) 3,155
Cash flow hedges:        
Unrealized gains (losses) on derivatives (cash flow hedges), gross 424 (411) 1,472 (162)
Tax effect (106) 157 (368) 62
Unrealized gains (losses) on derivatives (cash flow hedges), net 318 (254) 1,104 (100)
Reclassification of net unrealized (gains) losses on cash flow hedges to interest (income) expense, gross (540) (23) (899) 59
Tax effect 135 9 225 (23)
Reclassification of net unrealized (gains) losses on cash flow hedges to interest (income) expense, net (405) (14) (674) 36
Total cash flow hedges, net (87) (268) 430 (64)
Pension and other benefits:        
Amortization of prior service cost and actuarial gains, gross 295 435 590 870
Tax effect (74) (166) (148) (332)
Amortization of prior service cost and actuarial gains, net 221 269 442 538
Total pension and other benefits, net 221 269 442 538
Total other comprehensive (loss) income (3,748) 1,701 (14,459) 3,629
Comprehensive income $ 24,373 $ 23,060 $ 39,648 $ 45,267