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	$ 296,611	$ 255,479	$ 201,524
Interest and dividends on investment securities:
Taxable	6,456	9,131	8,482
Tax-exempt	2,797	3,929	3,276
Dividends	1,642	1,778	2,012
Interest on federal funds sold and other short-term investments	694	1,167	839
Total interest income	308,200	271,484	216,133
Interest expense:
Deposits	52,386	65,570	39,936
Borrowings	17,823	19,595	18,982
Total interest expense	70,209	85,165	58,918
Net interest income	237,991	186,319	157,215
Provision for loan losses	41,000	8,100	21,100
Net interest income after provision for loan losses	196,991	178,219	136,115
Noninterest income:
Income on bank owned life insurance	5,007	3,484	3,094
Net gains on sale of loans held-for-sale	2,085	512	61
Deposit, loan and other income	7,077	4,025	2,584
Net gains (losses) on equity securities	202	294	(266)
Net gains (losses) on sale of investment securities	29	(280)
Total noninterest income	14,400	8,035	5,473
Noninterest expense:
Salaries and employee benefits	58,877	49,021	39,556
Occupancy and equipment	13,882	9,712	8,312
FDIC insurance	4,002	2,011	3,115
Professional and consulting	7,383	5,506	3,568
Marketing and advertising	1,200	1,353	980
Data processing	6,008	4,503	4,421
Merger expenses	14,640	8,955	1,335
Loss on extinguishment of debt		1,047
Amortization of core deposit intangible	2,559	1,408	627
Other components of net periodic pension (income) expense	(119)	114	28
Increase in value of acquisition price	2,333
Other expenses	10,236	8,598	8,512
Total noninterest expenses	121,001	92,228	70,454
Income before income tax expense	90,390	94,026	71,134
Income tax expense	19,101	20,631	10,782
Net income	$ 71,289	$ 73,395	$ 60,352
Earnings per common share:
Basic	$ 1.80	$ 2.08	$ 1.87
Diluted	$ 1.79	$ 2.07	$ 1.86