Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus	Capital Surplus Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning Balance at Dec. 31, 2022	$ 577,852	$ 175	$ 578,027	$ 47,619	$ 47,619	$ 170,980	$ 170,980	$ 706,696	$ 175	$ 706,871	$ (215,955)	$ (215,955)	$ (131,488)	$ (131,488)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	57,074			0		0		57,074			0		0
Other comprehensive income (loss)	1,040			0		0		0			0		1,040
Cash dividends declared	(19,697)			0		0		(19,697)			0		0
Stock-based compensation expense	1,726			0		1,726		0			0		0
Restricted awards granted	0			0		(3,534)		0			3,534		0
Purchase of treasury shares	(44,056)			0		0		0			(44,056)		0
Acquisition of Citizens Commerce Bancshares, Inc.	62,078			0		7,574		0			54,504		0
Ending balance at Jun. 30, 2023	636,192			47,619		176,746		744,248			(201,973)		(130,448)
Beginning Balance at Mar. 31, 2023	651,050			47,619		177,529		721,727			(179,436)		(116,389)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32,733			0		0		32,733			0		0
Other comprehensive income (loss)	(14,059)			0		0		0			0		(14,059)
Cash dividends declared	(10,212)			0		0		(10,212)			0		0
Stock-based compensation expense	633			0		633		0			0		0
Restricted awards granted	0			0		(1,416)		0			1,416		0
Purchase of treasury shares	(23,953)			0		0		0			(23,953)		0
Ending balance at Jun. 30, 2023	636,192			47,619		176,746		744,248			(201,973)		(130,448)
Beginning Balance at Dec. 31, 2023	677,066			47,619		177,424		780,299			(217,737)		(110,539)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	58,638			0		0		58,638			0		0
Other comprehensive income (loss)	(11,779)			0		0		0			0		(11,779)
Cash dividends declared	(21,388)			0		0		(21,388)			0		0
Stock-based compensation expense	1,807			0		1,807		0			0		0
Restricted awards granted	0			0		(4,204)		0			4,204		0
Exercise of stock options	292			0		(193)		0			485		0
Purchase of treasury shares	(17,896)			0		0		0			(17,896)		0
Ending balance at Jun. 30, 2024	$ 686,740			47,619		174,834		817,549			(230,944)		(122,318)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	5,009
Beginning Balance at Mar. 31, 2024	$ 682,231			47,619		175,747		799,024			(218,555)		(121,604)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,115			0		0		29,115			0		0
Other comprehensive income (loss)	(714)			0		0		0			0		(714)
Cash dividends declared	(10,590)			0		0		(10,590)			0		0
Stock-based compensation expense	707			0		707		0			0		0
Restricted awards granted	0			0		(1,486)		0			1,486		0
Exercise of stock options	234			0		(134)		0			368		0
Purchase of treasury shares	(14,243)			0		0		0			(14,243)		0
Ending balance at Jun. 30, 2024	$ 686,740			$ 47,619		$ 174,834		$ 817,549			$ (230,944)		$ (122,318)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	3,700