Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net income	$ 35,926	$ 38,802	$ 36,340
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	12,668	3,571	2,393
Depreciation and amortization of premises and equipment	4,458	3,448	2,912
Amortization of premiums on investments, net	1,468	195	40
Amortization of FDIC indemnification asset, net	1,690	2,377	2,181
Amortization of intangible assets	1,450	997	1,039
Goodwill impairment	0	0	1,492
Accretion on acquired loans	(7,991)	(3,231)	(6,391)
Equity-based compensation expense	1,643	1,481	1,158
Issuance of common stock to 401(k) plan	507	411	352
Gain on sale of premises and equipment, net	(59)	(75)	(25)
Provision expense and loss on sale of other real estate owned	319	1,253	1,313
(Gain) loss on sale of securities	(385)	43	618
Writedowns of property, plant & equipment	812	380	1,007
Loss on extinguishment of debt	0	0	1,096
(Increase) decrease in other operating activities	(6,662)	7,003	3,974
Net cash provided by operating activities	45,844	56,655	49,499
Investing activities
Proceeds from sale of securities available for sale	51,027	13,898	8,937
Proceeds from maturities, prepayments, and calls of securities available for sale	44,676	32,863	68,765
Proceeds from maturities and calls of securities held to maturity	0	25,000	0
Payments to acquire securities available for sale	(10,267)	(8,255)	(67,355)
(Originations of) proceeds from repayments loans, net	(69,259)	85,233	39,512
Proceeds from bank owned life insurance	0	0	458
(Redemption of) payments for FHLB stock, net	(12)	129	(2,122)
Cash proceeds from mergers, acquisitions, and divestitures, net	0	25,863	10
Payments to the FDIC	(30)	(152)	(151)
Proceeds from sale of premises and equipment	2,861	1,955	955
Payments to acquire premises and equipment	(3,195)	(8,411)	(2,551)
Proceeds from sale of other real estate owned	1,997	3,254	2,940
Net cash provided by investing activities	17,798	171,377	49,398
Financing activities
Increase in noninterest-bearing deposits, net	144,927	12,604	5,407
Increase (decrease) in interest-bearing deposits, net	71,408	(41,445)	(79,548)
Repayments of securities sold under agreements to repurchase, net	(637)	(27,769)	(716)
Repayments of FHLB and other borrowings, net	(40)	0	(50,000)
Proceeds from stock options exercised	0	136	384
Payments for repurchase of common stock	(21,872)	(16,362)	(34,412)
Payments of common stock dividends	(17,876)	(15,060)	(21,090)
Net cash provided by (used in) financing activities	175,910	(87,896)	(179,975)
Net increase (decrease) in cash and cash equivalents	239,552	140,136	(81,078)
Cash and cash equivalents at beginning of period	217,009	76,873	157,951
Cash and cash equivalents at end of period	456,561	217,009	76,873
Supplemental disclosure -- cash flow information
Cash paid for interest	5,500	5,661	7,935
Cash paid for income taxes	9,074	8,057	7,610
Supplemental transactions -- non-cash items
Transfer of loans to other real estate	695	3,160	5,686
Loans originated to finance other real estate	266	484	164
Increase in accumulated other comprehensive loss	417	77	589
Non-cash sales price related to divestitures	0	0	1,603
Fair value of assets acquired	0	556,005	0
Fair value of liabilities assumed	0	506,179	0
Net assets acquired	0	49,826	0
Common stock issued in acquisition	$ 0	$ 86,631	$ 0