Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INTEREST INCOME
Loans and fees	$ 233,535	$ 193,143	$ 172,342
Federal funds sold and interest-bearing deposits with banks	1,720	1,559	880
Taxable investment securities and other	19,722	16,710	14,987
Tax-exempt investment securities	1,510	1,709	1,995
TOTAL INTEREST INCOME	256,487	213,121	190,204
INTEREST EXPENSE
Deposits	49,248	30,620	16,600
Federal funds purchased and securities sold under agreements to repurchase	1,471	471	198
Other borrowings	9,734	8,471	8,168
TOTAL INTEREST EXPENSE	60,453	39,562	24,966
NET INTEREST INCOME	196,034	173,559	165,238
Provision for loan losses	2,130	4,413	6,090
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	193,904	169,146	159,148
NONINTEREST INCOME
Service charges on deposit accounts	11,205	10,584	10,740
Commissions and fees	6,230	5,542	4,858
Income on bank owned life insurance	2,740	3,256	2,354
Gain (loss) on equity securities	496	(583)	0
Gains on sales of loans	1,660	1,329	1,836
Gain on sales and calls of investment securities, net	0	0	2,524
Swap income	3,231	1,992	982
Other income	1,234	190	2,141
TOTAL NONINTEREST INCOME	26,796	22,310	25,435
NONINTEREST EXPENSE
Salaries and employee benefits	77,287	68,595	61,166
Net occupancy expense	11,029	10,155	10,243
Furniture and equipment	8,681	8,297	8,269
FDIC insurance expense	431	1,608	1,577
Stationery, supplies and postage	1,599	1,625	1,797
Marketing expense	1,945	1,437	1,675
Data processing expense	4,913	3,609	1,993
Telecommunications expense	1,943	1,769	1,607
ATM and debit card expense	2,377	2,195	2,051
Core deposit intangible amortization	1,182	594	654
Other real estate and repossessed asset expense	256	158	181
Long-term debt prepayment fee	0	0	2,828
Merger related expenses	3,178	464	0
Other expenses	11,935	10,661	10,493
TOTAL NONINTEREST EXPENSE	126,756	111,167	104,534
Income before provision for income taxes	93,944	80,289	80,049
Provision for income taxes	23,272	16,888	27,469
NET INCOME	$ 70,672	$ 63,401	$ 52,580
PER SHARE OF COMMON STOCK:
Basic earnings (usd per share)	$ 1.39	$ 1.32	$ 1.10
Diluted earnings (usd per share)	1.38	1.32	1.09
Cash dividends paid (usd per share)	$ 0.49	$ 0.45	$ 0.40