Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans, including fees	$ 133,034	$ 131,834
Investment securities:
Taxable	11,915	8,597
Tax-exempt	1,399	1,496
Federal funds sold, securities purchased under agreements to resell and interest-bearing deposits with banks	1,452	1,463
Total interest income	147,800	143,390
Interest expense:
Deposits	14,437	16,645
Federal funds purchased and securities sold under agreements to repurchase	615	753
Other borrowings	4,735	2,725
Total interest expense	19,787	20,123
Net interest income	128,013	123,267
Provision for loan losses	36,533	1,488
Net interest income after provision for loan losses	91,480	121,779
Noninterest income:
Securities gains (losses), net		541
Recoveries on acquired loans		1,867
Other	3,955	2,188
Total noninterest income	44,132	32,058
Noninterest expense:
Salaries and employee benefits	60,978	58,431
Occupancy expense	12,287	11,612
Information services expense	9,306	9,009
OREO expense and loan related	587	751
Amortization of intangibles	3,007	3,281
Supplies, printing and postage expense	1,505	1,504
Professional fees	2,494	2,240
FDIC assessment and other regulatory charges	2,058	1,535
Advertising and marketing	814	807
Merger and branch consolidation related expense	4,129	1,114
Other	10,082	7,955
Total noninterest expense	107,247	98,239
Earnings:
Income before provision for income taxes	28,365	55,598
Provision for income taxes	4,255	11,231
Net income	$ 24,110	$ 44,367
Earnings per common share:
Basic (in dollars per share)	$ 0.72	$ 1.25
Diluted (in dollars per share)	$ 0.71	$ 1.25
Weighted average common shares outstanding:
Basic (in shares)	33,566	35,445
Diluted (in shares)	33,805	35,619
Fees on deposit accounts
Noninterest income:
Noninterest income	$ 18,141	$ 17,808
Mortgage banking income
Noninterest income:
Noninterest income	14,647	2,385
Trust and investment services income
Noninterest income:
Noninterest income	$ 7,389	$ 7,269