Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income Available to Common Shareholders	$ 102,071	$ 88,080	$ 89,595
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent [Abstract]
Unrealized (loss) gain on available-for-sale securities arising during period	(192,359)	(24,857)	31,157
Reclassification adjustment for net gains	(4)	(312)	(62)
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax	0	0	1,562
Other comprehensive (loss) income related to available-for-sale securities	(192,363)	(25,169)	32,657
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract]
Amortization of actuarial net gains	780	1,122	1,089
Recognition of unrealized (losses) gains	(697)	1,726	(352)
Change in underfunded pension liability	83	2,848	737
Other comprehensive (loss) income before income taxes	(192,280)	(22,321)	33,394
Tax effect	46,532	5,348	(8,001)
Other comprehensive (loss) income, net of tax	(145,748)	(16,973)	25,393
Comprehensive (loss) income, net of tax	$ (43,677)	$ 71,107	$ 114,988