CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Cumulative effect of ASC 326 adoption	Adjusted balance	Preferred	Preferred Adjusted balance	Common Stock	Common Stock Adjusted balance	Additional Paid-in Capital	Additional Paid-in Capital Adjusted balance	Retained Earnings	Retained Earnings Cumulative effect of ASC 326 adoption	Retained Earnings Adjusted balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Adjusted balance
Beginning balance (in shares) at Dec. 31, 2020				125	125	53,922,359	53,922,359
Beginning balance at Dec. 31, 2020	$ 1,875,645	$ (68,040)	$ 1,807,605	$ 125	$ 125	$ 6,740	$ 6,740	$ 1,005,366	$ 1,005,366	$ 788,578	$ (68,040)	$ 720,538	$ 74,836	$ 74,836
Comprehensive income:
Net income	49,469									49,469
Other comprehensive loss, net of tax	(39,026)												(39,026)
Cash dividends on common stock	(14,130)									(14,130)
Share-based compensation (in shares)						4,285
Share-based compensation	1,190					$ 1		1,189
Stock issued under employee benefit plans (in shares)						3,929
Stock issued under employee benefit plans	144							144
Stock issued under dividend reinvestment and stock purchase plan (in shares)						9,117
Stock issued under dividend reinvestment and stock purchase plan	443					$ 1		442
Stock options exercised (in shares)						14,300
Stock options exercised	171					$ 2		169
Restricted shares withheld for taxes (in shares)						(267)
Restricted shares withheld for taxes	(10)							(10)
Ending balance (in shares) at Mar. 31, 2021				125		53,953,723
Ending balance at Mar. 31, 2021	1,805,856			$ 125		$ 6,744		1,007,300		755,877			35,810
Beginning balance (in shares) at Dec. 31, 2021				125		53,410,411
Beginning balance at Dec. 31, 2021	1,912,571			$ 125		$ 6,676		985,818		864,839			55,113
Comprehensive income:
Net income	48,586									48,586
Other comprehensive loss, net of tax	(139,505)												(139,505)
Cash dividends on common stock	(15,607)									(15,607)
Share-based compensation (in shares)						1,200
Share-based compensation	1,100							1,100
Stock issued under dividend reinvestment and stock purchase plan (in shares)						10,639
Stock issued under dividend reinvestment and stock purchase plan	$ 471					$ 2		469
Stock options exercised (in shares)	3,000					3,000
Stock options exercised	$ 37							37
Restricted shares withheld for taxes (in shares)						(427)
Restricted shares withheld for taxes	(20)							(20)
Ending balance (in shares) at Mar. 31, 2022				125		53,424,823
Ending balance at Mar. 31, 2022	$ 1,807,633			$ 125		$ 6,678		$ 987,404		$ 897,818			$ (84,392)