Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Consolidated Statements of Comprehensive Income (Loss) (unaudited) [Abstract]
Net income	$ 32,716	$ 30,072	$ 66,539	$ 63,730
Securities available for sale:
Unrealized net holding gains (losses) arising during the period, gross	1,556	(26,783)	(3,736)	(11,058)
Tax effect	(389)	6,696	934	2,765
Unrealized net holding gains (losses) arising during the period, net	1,167	(20,087)	(2,802)	(8,293)
Reclassification adjustment for net losses in net income, gross	0	4,450	0	9,450
Tax effect	0	(1,113)	0	(2,363)
Reclassification adjustment for net losses in net income, net	0	3,337	0	7,087
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, gross	91	109	187	223
Tax effect	(23)	(28)	(47)	(56)
Amortization of unrealized net gains for the reclassification of available for sale securities to held to maturity, net	68	81	140	167
Total securities available for sale, net	1,235	(16,669)	(2,662)	(1,039)
Pension and other benefits:
Amortization of prior service cost and actuarial losses, gross	1,451	649	1,903	1,298
Tax effect	(363)	(162)	(476)	(325)
Amortization of prior service cost and actuarial losses, net	1,088	487	1,427	973
Increase in unrecognized actuarial loss, gross	(1,000)	0	(1,000)	0
Tax effect	250	0	250	0
Increase in unrecognized actuarial loss, net	(750)	0	(750)	0
Total pension and other benefits, net	338	487	677	973
Total other comprehensive income (loss)	1,573	(16,182)	(1,985)	(66)
Comprehensive income	$ 34,289	$ 13,890	$ 64,554	$ 63,664