CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Preferred Stock	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, 2022			125	10,000
Beginning balance at Dec. 31, 2022	$ 2,034,770		$ 125	$ 25,000	$ 7,396	$ 1,228,626	$ 1,012,774	$ (239,151)
Beginning balance (in shares) at Dec. 31, 2022					59,170,583
Comprehensive income:
Net income	181,307						181,307
Other comprehensive income (loss), 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
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
Ending balance at Sep. 30, 2023	2,092,644		$ 125	$ 25,000	$ 7,425	1,234,402	1,132,962	(307,270)
Ending balance (in shares) at Sep. 30, 2023					59,398,022
Beginning balance (in shares) at Jun. 30, 2023			125	10,000
Beginning balance at Jun. 30, 2023	2,145,565		$ 125	$ 25,000	$ 7,412	1,233,593	1,097,399	(217,964)
Beginning balance (in shares) at Jun. 30, 2023					59,297,148
Comprehensive income:
Net income	56,366						56,366
Other comprehensive income (loss), 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
Ending balance at Sep. 30, 2023	2,092,644		$ 125	$ 25,000	$ 7,425	1,234,402	1,132,962	(307,270)
Ending balance (in shares) at Sep. 30, 2023					59,398,022
Beginning balance (in shares) at Dec. 31, 2023		125	125	10,000
Beginning balance at Dec. 31, 2023	$ 2,247,713		$ 125	$ 25,000	$ 7,428	1,236,506	1,154,624	(175,970)
Beginning balance (in shares) at Dec. 31, 2023	59,424,122				59,424,122
Comprehensive income:
Net income	$ 137,053						137,053
Other comprehensive income (loss), net of tax	24,145							24,145
Cash dividends on preferred stock	(1,406)						(1,406)
Cash dividends on common stock	(61,146)						(61,146)
Repurchases of common stock (in shares)					(1,481,565)
Repurchases of common stock	(49,955)				$ (185)	(49,770)
Reduction of excise tax on common stock repurchases, net of share issuances	(457)					(457)
Share-based compensation (in shares)					83,356
Share-based compensation	4,191				$ 10	4,181
Stock issued under employee benefit plans (in shares)					17,120
Stock issued under employee benefit plans	511				$ 3	508
Stock issued under dividend reinvestment and stock purchase plan (in shares)					48,793
Stock issued under dividend reinvestment and stock purchase plan	$ 1,676				$ 6	1,670
Stock options exercised (in shares)	49,084				49,084
Stock options exercised	$ 900				$ 6	894
Restricted shares withheld for taxes (in shares)					(23,795)
Restricted shares withheld for taxes	(852)				$ (3)	(849)
Ending balance (in shares) at Sep. 30, 2024		125	125	10,000
Ending balance at Sep. 30, 2024	$ 2,302,373		$ 125	$ 25,000	$ 7,265	1,192,683	1,229,125	(151,825)
Ending balance (in shares) at Sep. 30, 2024	58,117,115				58,117,115
Beginning balance (in shares) at Jun. 30, 2024			125	10,000
Beginning balance at Jun. 30, 2024	$ 2,212,525		$ 125	$ 25,000	$ 7,256	1,191,193	1,200,930	(211,979)
Beginning balance (in shares) at Jun. 30, 2024					58,045,653
Comprehensive income:
Net income	49,187						49,187
Other comprehensive income (loss), net of tax	60,154							60,154
Cash dividends on preferred stock	(468)						(468)
Cash dividends on common stock	(20,524)						(20,524)
Reduction of excise tax on common stock repurchases, net of share issuances	25					25
Share-based compensation (in shares)					67,140
Share-based compensation	1,437				$ 8	1,429
Stock issued under employee benefit plans (in shares)					5,351
Stock issued under employee benefit plans	168				$ 1	167
Stock issued under dividend reinvestment and stock purchase plan (in shares)					14,903
Stock issued under dividend reinvestment and stock purchase plan	575				$ 2	573
Stock options exercised (in shares)					6,191
Stock options exercised	88				$ 1	87
Restricted shares withheld for taxes (in shares)					(22,123)
Restricted shares withheld for taxes	(794)				$ (3)	(791)
Ending balance (in shares) at Sep. 30, 2024		125	125	10,000
Ending balance at Sep. 30, 2024	$ 2,302,373		$ 125	$ 25,000	$ 7,265	$ 1,192,683	$ 1,229,125	$ (151,825)
Ending balance (in shares) at Sep. 30, 2024	58,117,115				58,117,115