Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Loans including fees:
Taxable		$ 128,727	$ 138,972
Nontaxable		3,625	4,223
Investment securities:
Taxable		27,356	28,037
Nontaxable		7,942	7,408
Money market and other interest-earning investments		349	278
Total interest income		167,999	178,918
Interest Expense
Deposits		12,298	16,444
Federal funds purchased and interbank borrowings		1,240	1,918
Securities sold under agreements to repurchase		384	662
Federal Home Loan Bank advances		7,768	9,931
Other borrowings		2,538	2,915
Total interest expense		24,228	31,870
Net interest income		143,771	147,048
Provision for loan losses	[1]	16,950	1,043
Net interest income after provision for loan losses		126,821	146,005
Noninterest Income
Wealth management fees		8,884	8,535
Service charges on deposit accounts		10,077	10,826
Debit card and ATM fees		4,998	5,503
Mortgage banking revenue		11,119	5,011
Investment product fees		5,874	5,271
Capital markets income		4,328	2,517
Company-owned life insurance		3,080	3,188
Debt securities gains (losses), net		5,174	(103)
Other income		3,968	5,668
Total noninterest income		57,502	46,416
Noninterest Expense
Salaries and employee benefits		79,173	71,183
Occupancy		15,133	14,578
Equipment		5,305	4,474
Marketing		3,097	3,723
Data processing		9,467	9,341
Communication		2,798	3,054
Professional fees		4,293	2,910
Loan expenses		1,771	1,912
FDIC assessment		1,609	2,087
Amortization of intangibles		3,776	4,472
Amortization of tax credit investments		5,515	260
Other expense		26,807	5,047
Total noninterest expense		158,744	123,041
Income before income taxes		25,579	69,380
Income tax expense		2,939	13,104
Net income		$ 22,640	$ 56,276
Net income per common share - basic (in dollars per share)		$ 0.13	$ 0.32
Net income per common share - diluted (in dollars per share)		$ 0.13	$ 0.32
Weighted average number of common shares outstanding - basic (in shares)		167,748	174,734
Weighted average number of common shares outstanding - diluted (in shares)		168,404	175,368
Dividends per common share (in dollars per share)		$ 0.14	$ 0.13

[1] Net income per common share - basic