Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.79	$ 0.72		$ 2.22	$ 2.02
Exercise of stock options (in shares)				5,009
Purchase of treasury shares (in shares)		109,382		178,529	596,969
Adjustment to shareholders' equity	$ 741,299	$ 610,134		$ 741,299	$ 610,134
Net income available to common shareholders	29,809	29,839		88,447	86,913
Other comprehensive income (loss), net of tax	35,454	(36,145)		23,675	(35,105)
Dividends, Common Stock, Cash	(11,580)	(10,662)		(32,968)	(30,359)
Stock-based compensation expense	876	681		2,683	2,407
Restricted awards granted	$ 0	0		0	0
Purchase of treasury shares		$ (9,771)		$ (17,896)	(53,827)
Acquisition of Citizens Commerce Bancshares, Inc.					$ 62,078
Accounting Standards Update [Extensible List]			Accounting Standards Update 2022-02 [Member]