Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 70,672	$ 63,401	$ 52,580
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization of premiums, discounts and deferred loan fees and costs	3,660	4,153	5,153
Depreciation and amortization	1,645	5,555	4,536
Amortization of intangible assets	1,182	594	654
Amortization of operating lease right-of-use assets	2,592
Provision for loan losses	2,130	4,413	6,090
Stock based compensation	2,545	2,425	2,325
Loans originated for sale	(57,605)	(49,748)	(60,783)
Proceeds from sales of loans held for sale	59,748	50,420	63,905
Gains on sales of securities	0	0	(2,524)
Gains on sales of loans held for sale	(1,660)	(1,329)	(1,836)
Gains on proceeds from bank owned life insurance policies	0	(421)	(109)
Change in market value of equity securities	(496)	583	0
Losses (gains) on other real estate and other repossessed assets	72	(338)	(646)
Loss (gain) on sale of premises and equipment	497	561	(838)
Long-term debt prepayment penalty	0	0	2,828
Deferred tax expense (benefit)	2,854	(13,571)	16,904
Excess tax benefits	189	318	587
(Increase) decrease in other assets	(15,986)	2,679	(25,065)
Increase in other liabilities	15,092	9,743	3,705
NET CASH PROVIDED BY OPERATING ACTIVITIES	87,131	79,438	67,466
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash acquired in acquisitions	13,454	0	0
Proceeds from repayments and maturities of available for sale securities	147,130	91,833	91,314
Proceeds from repayments and maturities of held to maturity securities	31,457	26,083	43,218
Proceeds from sales of equity securities	1,287	2,155	0
Proceeds from sales of available for sale securities	0	0	4,500
Purchase of available for sale securities	(211,503)	(110,370)	(140,258)
Purchase of held to maturity securities	(21,453)	(40,753)	(35,841)
Purchase of equity securities	(1,343)	(570)	(307)
Proceeds from redemptions of Federal Home Loan Bank stock	95,643	6,799	13,497
Purchases of Federal Home Loan Bank stock	(103,080)	(7,524)	(10,974)
Purchase of bank owned life insurance	0	0	(33,000)
Death benefit proceeds from bank owned life insurance policy	121	755	312
Net increase in loans	(252,441)	(310,256)	(289,914)
Proceeds from dispositions and sales of bank premises and equipment	1,827	697	1,638
Purchases of premises and equipment	(5,936)	(5,523)	(3,972)
Proceeds from sales of other real estate and other repossessed assets	860	4,116	4,638
NET CASH USED IN INVESTING ACTIVITIES	(303,977)	(342,558)	(355,149)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in deposits	264,279	252,329	276,537
Increase in federal funds purchased and securities sold under agreements to repurchase	94,753	108,969	68,582
Proceeds from other borrowings	46,260	60,003	306,184
Repayments of other borrowings	(89,353)	(70,752)	(377,183)
Exercise of stock options	313	307	321
Retirement of restricted stock	(715)	(763)	(773)
Dividends paid	(24,919)	(21,307)	(18,853)
NET CASH PROVIDED BY FINANCING ACTIVITIES	290,618	328,786	254,815
Net increase (decrease) in cash and cash equivalents	73,772	65,666	(32,868)
Cash and cash equivalents, beginning of year	208,599	142,933	175,801
CASH AND CASH EQUIVALENTS, END OF YEAR	282,371	208,599	142,933
Supplemental schedule of non-cash investing and financing activities:
Cash paid during the period for income taxes	15,944	18,614	27,423
Cash paid during the period for interest	59,949	38,679	24,571
Transfer of loans into other repossessed assets and other real estate owned	665	3,765	3,763
Initial recognition of operating lease right-of-use assets	18,651
Initial recognition of operating lease liabilities	20,203
Non-cash assets acquired:
Federal Home Loan Bank stock	1,767	0	0
Investment securities	22,734	0	0
Loans, including loans held for sale	426,118	0	0
Goodwill and other intangible assets, net	23,125	0	0
Other assets	9,304	0	0
Total non-cash assets acquired	483,048	0	0
Liabilities assumed:
Deposits	409,638	0	0
Other borrowings	40,957	0	0
Other liabilities	2,490	0	0
Total liabilities assumed	453,085	0	0
Common stock issued for acquisitions	$ 43,417	$ 0	$ 0