CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans, including fees	$ 236,420	$ 229,379
Securities:
Taxable	10,268	13,540
Tax-exempt	13,824	11,672
Federal funds sold and other	2,557	3,292
Total interest income	263,069	257,883
Interest expense:
Deposits	50,698	54,217
Securities sold under agreements to repurchase	115	145
Federal Home Loan Bank advances and other borrowings	18,704	16,275
Total interest expense	69,517	70,637
Net interest income	193,552	187,246
Provision for credit losses	99,889	7,184
Net interest income after provision for credit losses	93,663	180,062
Noninterest income:
Total noninterest income	70,377	51,063
Noninterest expense:
Salaries and employee benefits	80,480	70,376
Equipment and occupancy	20,978	19,331
Other real estate expense, net	2,415	246
Marketing and other business development	3,251	2,948
Postage and supplies	1,990	1,892
Amortization of intangibles	2,520	2,311
Other noninterest expense	25,715	16,947
Total noninterest expense	137,349	114,051
Income before income taxes	26,691	117,074
Income tax expense (benefit)	(1,665)	23,114
Net income	$ 28,356	$ 93,960
Per share information:
Basic net income per common share (in dollars per share)	$ 0.37	$ 1.22
Diluted net income per common share (in dollars per share)	$ 0.37	$ 1.22
Weighted average shares outstanding:
Basic (in shares)	75,803,402	76,803,171
Diluted (in shares)	75,966,295	77,127,692
Service charges on deposit accounts
Noninterest income:
Total noninterest income	$ 9,032	$ 8,542
Investment services
Noninterest income:
Total noninterest income	9,239	5,468
Insurance sales commissions
Noninterest income:
Total noninterest income	3,240	2,928
Gain on mortgage loans sold, net
Noninterest income:
Total noninterest income	8,583	4,878
Investment gains and losses on sales, net
Noninterest income:
Total noninterest income	463	(1,960)
Trust fees
Noninterest income:
Total noninterest income	4,170	3,295
Income from equity method investment
Noninterest income:
Total noninterest income	15,592	13,290
Other noninterest income
Noninterest income:
Total noninterest income	$ 20,058	$ 14,622