CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 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, 2018				125		49,349,800
Beginning balance at Dec. 31, 2018	$ 1,408,260			$ 125		$ 6,169		$ 840,052		$ 583,336			$ (21,422)
Comprehensive income
Net income	164,460									164,460
Other comprehensive income (loss), net of tax	49,296												49,296
Cash dividends on common stock	(51,276)									(51,276)
Issuance of common stock related to acquisitions (in shares)						6,383,806
Issuance of common stock related to acquisitions	229,926					$ 798		229,128
Repurchases of common stock (in shares)						(516,016)
Repurchases of common stock	(19,041)					$ (65)		(18,976)
Share-based compensation (in shares)						116,572
Share-based compensation	4,115					$ 15		4,100
Stock issued under employee benefit plans (in shares)						21,521
Stock issued under employee benefit plans	702					$ 3		699
Stock issued under dividend reinvestment and stock purchase plan (in shares)						38,942
Stock issued under dividend reinvestment and stock purchase plan	1,531					$ 5		1,526
Stock options exercised (in shares)						16,950
Stock options exercised	144					$ 2		142
Restricted shares withheld for taxes (in shares)						(43,093)
Restricted shares withheld for taxes	(1,680)					$ (6)		(1,674)
Ending balance (in shares) at Dec. 31, 2019				125		55,368,482
Ending balance at Dec. 31, 2019	1,786,437			$ 125		$ 6,921		1,054,997		696,520			27,874
Comprehensive income
Net income	148,600									148,600
Other comprehensive income (loss), net of tax	46,962												46,962
Cash dividends on common stock	(56,542)									(56,542)
Issuance of common stock related to acquisitions	0
Repurchases of common stock (in shares)						(1,634,437)
Repurchases of common stock	(55,912)					$ (204)		(55,708)
Share-based compensation (in shares)						128,292
Share-based compensation	4,600					$ 16		4,584
Stock issued under employee benefit plans (in shares)						25,423
Stock issued under employee benefit plans	639					$ 3		636
Stock issued under dividend reinvestment and stock purchase plan (in shares)						60,806
Stock issued under dividend reinvestment and stock purchase plan	1,726					$ 8		1,718
Stock options exercised (in shares)						13,550
Stock options exercised	115					$ 2		113
Restricted shares withheld for taxes (in shares)						(39,757)
Restricted shares withheld for taxes	(980)					$ (6)		(974)
Ending balance (in shares) at Dec. 31, 2020				125	125	53,922,359	53,922,359
Ending 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	205,531									205,531
Other comprehensive income (loss), net of tax	(19,723)												(19,723)
Cash dividends on common stock	(61,230)									(61,230)
Issuance of common stock related to acquisitions	0
Repurchases of common stock (in shares)						(646,102)
Repurchases of common stock	(25,444)					$ (81)		(25,363)
Share-based compensation (in shares)						94,510
Share-based compensation	4,762					$ 12		4,750
Stock issued under employee benefit plans (in shares)						16,507
Stock issued under employee benefit plans	605					$ 2		603
Stock issued under dividend reinvestment and stock purchase plan (in shares)						43,861
Stock issued under dividend reinvestment and stock purchase plan	$ 1,880					$ 5		1,875
Stock options exercised (in shares)	17,300					17,300
Stock options exercised	$ 198					$ 2		196
Restricted shares withheld for taxes (in shares)						(38,024)
Restricted shares withheld for taxes	(1,613)					$ (4)		(1,609)
Ending balance (in shares) at Dec. 31, 2021				125		53,410,411
Ending balance at Dec. 31, 2021	$ 1,912,571			$ 125		$ 6,676		$ 985,818		$ 864,839			$ 55,113