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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]        
Net income $ 29,807 $ 22,876 $ 83,914 $ 64,514
Securities available for sale:        
Unrealized net holding (losses) gains arising during the period, gross (5,798) 1,355 (26,605) 4,719
Tax effect 1,449 (518) 6,651 (1,823)
Unrealized net holding (losses) gains arising during the period, net (4,349) 837 (19,954) 2,896
Reclassification adjustment for net losses in net income, gross 0 4 0 2
Tax effect 0 (2) 0 (1)
Reclassification adjustment for net losses in net income, net 0 2 0 1
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross 168 212 533 675
Tax effect (42) (81) (133) (258)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net 126 131 400 417
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 (4,223) 970 (19,554) 4,125
Cash flow hedges:        
Unrealized gains (losses) on derivatives (cash flow hedges), gross 175 91 1,647 (71)
Tax effect (44) (35) (412) 27
Unrealized gains (losses) on derivatives (cash flow hedges), net 131 56 1,235 (44)
Reclassification of net unrealized (gains) on cash flow hedges to interest (income) expense, gross (638) (155) (1,537) (96)
Tax effect 159 59 384 37
Reclassification of net unrealized (gains) on cash flow hedges to interest (income) expense, net (479) (96) (1,153) (59)
Total cash flow hedges, net (348) (40) 82 (103)
Pension and other benefits:        
Amortization of prior service cost and actuarial gains, gross 286 480 876 1,350
Tax effect (71) (183) (219) (516)
Amortization of prior service cost and actuarial gains, net 215 297 657 834
Total pension and other benefits, net 215 297 657 834
Total other comprehensive (loss) income (4,356) 1,227 (18,815) 4,856
Comprehensive income $ 25,451 $ 24,103 $ 65,099 $ 69,370