Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 151,995	$ 154,885	$ 104,388
Securities available for sale:
Unrealized net holding (losses) gains arising during the period, gross	(209,212)	(37,432)	23,204
Tax effect	52,303	9,358	(5,800)
Unrealized net holding (losses) gains arising during the period, net	(156,909)	(28,074)	17,404
Reclassification adjustment for net (gains) in net income, gross	0	0	(3)
Tax effect	0	0	1
Reclassification adjustment for net (gains) in net income, net	0	0	(2)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross	513	577	644
Tax effect	(128)	(145)	(161)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net	385	432	483
Total securities available for sale, net	(156,524)	(27,642)	17,885
Cash flow hedges:
Unrealized losses on derivatives (cash flow hedges), gross	0	0	(275)
Tax effect	0	0	69
Unrealized losses on derivatives (cash flow hedges), net	0	0	(206)
Reclassification of net unrealized losses on cash flow hedges to interest expense, gross	0	21	296
Tax effect	0	(5)	(74)
Reclassification of net unrealized losses on cash flow hedges to interest expense, net	0	16	222
Total cash flow hedges, net	0	16	16
Pension and other benefits:
Amortization of prior service cost and actuarial losses, gross	737	1,373	1,627
Tax effect	(184)	(343)	(407)
Amortization of prior service cost and actuarial losses, net	553	1,030	1,220
(Increase) decrease in unrecognized actuarial loss, gross	(14,292)	3,780	429
Tax effect	3,573	(945)	(107)
(Increase) decrease in unrecognized actuarial loss, net	(10,719)	2,835	322
Total pension and other benefits, net	(10,166)	3,865	1,542
Total other comprehensive (loss) income	(166,690)	(23,761)	19,443
Comprehensive (loss) income	$ (14,695)	$ 131,124	$ 123,831