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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Consolidated Statements of Comprehensive Income [Abstract]      
Net income $ 154,885 $ 104,388 $ 121,021
Securities available for sale:      
Unrealized net holding (losses) gains arising during the period, gross (37,432) 23,204 25,836
Tax effect 9,358 (5,800) (6,459)
Unrealized net holding (losses) gains arising during the period, net (28,074) 17,404 19,377
Reclassification adjustment for net (gains) losses in net income, gross 0 (3) 79
Tax effect 0 1 (20)
Reclassification adjustment for net (gains) losses in net income, net 0 (2) 59
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross 577 644 737
Tax effect (145) (161) (184)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net 432 483 553
Total securities available for sale, net (27,642) 17,885 19,989
Cash flow hedges:      
Unrealized losses on derivatives (cash flow hedges), gross 0 (275) (459)
Tax effect 0 69 115
Unrealized losses on derivatives (cash flow hedges), net 0 (206) (344)
Reclassification of net unrealized losses (gains) on cash flow hedges to interest expense, gross 21 296 (2,012)
Tax effect (5) (74) 503
Reclassification of net unrealized losses (gains) on cash flow hedges to interest expense, net 16 222 (1,509)
Total cash flow hedges, net 16 16 (1,853)
Pension and other benefits:      
Amortization of prior service cost and actuarial losses, gross 1,373 1,627 2,686
Tax effect (343) (407) (672)
Amortization of prior service cost and actuarial losses, net 1,030 1,220 2,014
Decrease in unrecognized actuarial loss, gross 3,780 429 5,331
Tax effect (945) (107) (1,333)
Decrease in unrecognized actuarial loss, net 2,835 322 3,998
Total pension and other benefits, net 3,865 1,542 6,012
Total other comprehensive (loss) income (23,761) 19,443 24,148
Comprehensive income $ 131,124 $ 123,831 $ 145,169