Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income
Interest and fees on loans	$ 213,099	$ 220,784	$ 208,609
Interest on investment securities:
Taxable interest income	20,429	19,881	10,638
Tax-exempt interest income	725	1,007	1,482
Other, principally overnight investments	3,431	8,435	10,478
Total interest income	237,684	250,107	231,207
Interest Expense
Savings, checking and money market accounts	6,551	9,551	5,074
Time deposits of $100,000 or more	8,215	13,598	8,356
Other time deposits	1,535	1,901	1,061
Borrowings	3,261	8,853	9,286
Total interest expense	19,562	33,903	23,777
Net interest income	218,122	216,204	207,430
Provision (reversal) for loan losses	35,039	2,263	(3,589)
Net interest income after provision for loan losses	183,083	213,941	211,019
Noninterest Income
Service charges on deposit accounts	11,098	12,970	12,690
Other service charges, commissions and fees	20,097	19,481	16,488
Fees from presold mortgage loans	14,183	3,944	2,735
Commissions from sales of insurance and financial products	8,848	8,495	8,731
SBA consulting fees	8,644	3,872	4,675
SBA loan sale gains	7,973	8,275	10,366
Bank-owned life insurance income	2,533	2,564	2,534
Securities gains, net	8,024	97	0
Other gains (losses), net	(54)	(169)	723
Total noninterest income	81,346	59,529	58,942
Noninterest Expenses
Salaries	84,941	79,129	75,077
Employee benefits	16,027	16,844	16,888
Total personnel expense	100,968	95,973	91,965
Occupancy expense	11,278	11,122	10,793
Equipment related expenses	4,285	5,023	5,627
Merger and acquisition expenses	0	192	2,358
Intangibles amortization	3,956	4,858	5,917
Foreclosed property losses, net	547	939	565
Other operating expenses	40,264	39,087	39,258
Total noninterest expenses	161,298	157,194	156,483
Income before income taxes	103,131	116,276	113,478
Income tax expense	21,654	24,230	24,189
Net income	$ 81,477	$ 92,046	$ 89,289
Earnings per common share: Basic (in usd per shares)	$ 2.81	$ 3.10	$ 3.02
Diluted (in dollars per share)	2.81	3.10	3.01
Dividends declared per common share (in usd per shares)	$ 0.72	$ 0.54	$ 0.40
Weighted average common shares outstanding:
Basic (in shares)	28,839,866	29,547,851	29,566,259
Diluted (in shares)	28,981,567	29,720,499	29,707,431