Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income Available to Common Shareholders	$ 114,365	$ 102,071	$ 88,080
Available-for-Sale Securities
Unrealized gain (loss) on available-for-sale securities arising during period	21,442	(192,359)	(24,857)
Reclassification adjustment for net losses (gains)	4,908	(4)	(312)
Other comprehensive income (loss) related to available-for-sale securities	26,350	(192,363)	(25,169)
Defined Benefit Pension Plan
Net gain (loss) arising during period	777	(697)	1,726
Reclassification adjustment for amortization of actuarial net gains in net periodic pension cost	344	780	1,122
Change in underfunded pension liability	1,121	83	2,848
Other comprehensive income (loss) before income taxes	27,471	(192,280)	(22,321)
Tax effect	(6,522)	46,532	5,348
Other comprehensive income (loss), net of tax	20,949	(145,748)	(16,973)
Comprehensive income (loss), net of tax	$ 135,314	$ (43,677)	$ 71,107