CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock Cumulative Preferred Stock	Preferred Stock Non-Cumulative Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2021		125	0	53,410,411
Beginning balance at Dec. 31, 2021	$ 1,912,571	$ 125	$ 0	$ 6,676	$ 985,818	$ 864,839	$ 55,113
Comprehensive income (loss):
Net income	151,329					151,329
Other comprehensive (loss) income, net of tax	(369,202)						(369,202)
Cash dividends on preferred stock	(938)					(938)
Cash dividends on common stock	(53,688)					(53,688)
Issuance of common stock related to acquisition (in shares)			10,000	5,588,962
Issuance of stock related to acquisition	262,389		$ 25,000	$ 699	236,690
Share-based compensation (in shares)				112,443
Share-based compensation	3,430			$ 14	3,416
Stock issued under employee benefit plans (in shares)				15,072
Stock issued under employee benefit plans	520			$ 2	518
Stock issued under dividend reinvestment and stock purchase plan (in shares)				37,693
Stock issued under dividend reinvestment and stock purchase plan	1,536			$ 5	1,531
Stock options exercised (in shares)				20,095
Stock options exercised	336			$ 3	333
Restricted shares withheld for taxes (in shares)				(39,262)
Restricted shares withheld for taxes	(1,617)			$ (6)	(1,611)
Ending balance (in shares) at Sep. 30, 2022		125	10,000	59,145,414
Ending balance at Sep. 30, 2022	1,906,666	$ 125	$ 25,000	$ 7,393	1,226,695	961,542	(314,089)
Beginning balance (in shares) at Jun. 30, 2022		125	10,000	59,059,866
Beginning balance at Jun. 30, 2022	1,977,641	$ 125	$ 25,000	$ 7,383	1,226,378	917,311	(198,556)
Comprehensive income (loss):
Net income	63,752					63,752
Other comprehensive (loss) income, net of tax	(115,533)						(115,533)
Cash dividends on preferred stock	(469)					(469)
Cash dividends on common stock	(19,052)					(19,052)
Share-based compensation (in shares)				105,409
Share-based compensation	1,186			$ 13	1,173
Stock issued under employee benefit plans (in shares)				6,017
Stock issued under employee benefit plans	203			$ 1	202
Stock issued under dividend reinvestment and stock purchase plan (in shares)				12,769
Stock issued under dividend reinvestment and stock purchase plan	528			$ 2	526
Restricted shares withheld for taxes (in shares)				(38,647)
Restricted shares withheld for taxes	(1,590)			$ (6)	(1,584)
Ending balance (in shares) at Sep. 30, 2022		125	10,000	59,145,414
Ending balance at Sep. 30, 2022	1,906,666	$ 125	$ 25,000	$ 7,393	1,226,695	961,542	(314,089)
Beginning balance (in shares) at Dec. 31, 2022		125	10,000	59,170,583
Beginning balance at Dec. 31, 2022	2,034,770	$ 125	$ 25,000	$ 7,396	1,228,626	1,012,774	(239,151)
Comprehensive income (loss):
Net income	181,307					181,307
Other comprehensive (loss) income, net of tax	(68,119)						(68,119)
Cash dividends on preferred stock	(1,406)					(1,406)
Cash dividends on common stock	(59,713)					(59,713)
Share-based compensation (in shares)				129,092
Share-based compensation	3,792			$ 16	3,776
Stock issued under employee benefit plans (in shares)				21,661
Stock issued under employee benefit plans	590			$ 3	587
Stock issued under dividend reinvestment and stock purchase plan (in shares)				52,061
Stock issued under dividend reinvestment and stock purchase plan	$ 1,603			$ 7	1,596
Stock options exercised (in shares)	65,025			65,025
Stock options exercised	$ 1,110			$ 8	1,102
Restricted shares withheld for taxes (in shares)				(40,400)
Restricted shares withheld for taxes	(1,290)			$ (5)	(1,285)
Ending balance (in shares) at Sep. 30, 2023		125	10,000	59,398,022
Ending balance at Sep. 30, 2023	2,092,644	$ 125	$ 25,000	$ 7,425	1,234,402	1,132,962	(307,270)
Beginning balance (in shares) at Jun. 30, 2023		125	10,000	59,297,148
Beginning balance at Jun. 30, 2023	2,145,565	$ 125	$ 25,000	$ 7,412	1,233,593	1,097,399	(217,964)
Comprehensive income (loss):
Net income	56,366					56,366
Other comprehensive (loss) income, net of tax	(89,306)						(89,306)
Cash dividends on preferred stock	(468)					(468)
Cash dividends on common stock	(20,335)					(20,335)
Share-based compensation (in shares)				114,435
Share-based compensation	1,360			$ 14	1,346
Stock issued under employee benefit plans (in shares)				8,226
Stock issued under employee benefit plans	210			$ 1	209
Stock issued under dividend reinvestment and stock purchase plan (in shares)				18,524
Stock issued under dividend reinvestment and stock purchase plan	539			$ 3	536
Restricted shares withheld for taxes (in shares)				(40,311)
Restricted shares withheld for taxes	(1,287)			$ (5)	(1,282)
Ending balance (in shares) at Sep. 30, 2023		125	10,000	59,398,022
Ending balance at Sep. 30, 2023	$ 2,092,644	$ 125	$ 25,000	$ 7,425	$ 1,234,402	$ 1,132,962	$ (307,270)