Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest revenue:
Loans, including fees	$ 505,734	$ 494,212	$ 476,039
Investment securities:
Taxable	61,994	55,031	69,920
Tax exempt	8,978	7,043	4,564
Deposits in banks and short-term investments	2,088	1,710	2,183
Total interest revenue	578,794	557,996	552,706
Interest expense:
Deposits	14,845	41,772	66,856
Short-term borrowings	0	3	838
Federal Home Loan Bank advances	3	28	2,697
Long-term debt	14,912	14,434	12,921
Total interest expense	29,760	56,237	83,312
Net interest revenue	549,034	501,759	469,394
(Release of) provision for credit losses	(37,550)	80,434	13,150
Net interest revenue after provision for credit losses	586,584	421,325	456,244
Noninterest income:
Wealth management fees	18,998	9,240	6,150
Gains from other loan sales, net	11,267	5,420	6,867
Other lending and loan servicing fees	9,427	8,028	4,054
Securities gains (losses), net	83	748	(1,021)
Other	25,729	24,185	24,721
Total noninterest income	157,818	156,109	104,713
Total revenue	744,402	577,434	560,957
Noninterest expenses:
Salaries and employee benefits	241,443	224,060	196,440
Occupancy	28,619	25,791	23,350
Communications and equipment	29,829	27,149	24,613
Professional fees	20,589	18,032	17,028
Lending and loan servicing expense	10,859	10,993	9,416
Outside services - electronic banking	9,481	7,513	7,020
Postage, printing and supplies	7,110	6,779	6,370
Advertising and public relations	5,910	15,203	6,170
FDIC assessments and other regulatory charges	7,398	5,982	4,901
Amortization of intangibles	4,045	4,168	4,938
Merger-related and other charges	13,970	7,018	6,907
Other	17,386	15,301	15,092
Total noninterest expenses	396,639	367,989	322,245
Income before income taxes	347,763	209,445	238,712
Income tax expense	77,962	45,356	52,991
Net income	269,801	164,089	185,721
Net income available to common shareholders, basic	261,269	159,269	184,346
Net income available to common shareholders, diluted	$ 261,269	$ 159,269	$ 184,346
Income per common share:
Basic (in dollars per share)	$ 2.97	$ 1.91	$ 2.31
Diluted (in dollars per share)	$ 2.97	$ 1.91	$ 2.31
Weighted average common shares outstanding:
Basic (in shares)	87,940	83,184	79,700
Diluted (in shares)	88,097	83,248	79,708
Service charges and fees
Noninterest income:
Service charges and other related fees	$ 33,868	$ 32,401	$ 36,797
Mortgage loan gains and related fees
Noninterest income:
Service charges and other related fees	$ 58,446	$ 76,087	$ 27,145