CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income	$ 71,289	$ 73,395	$ 60,352
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and amortization of premises and equipment	4,244	3,053	3,062
Provision for loan losses	41,000	8,100	21,100
Amortization of intangibles	2,559	1,408	627
Net accretion of loans	(6,687)	(5,056)	(1,127)
Accretion on bank premises	(90)	(86)	(67)
Accretion on deposits	(4,301)	(1,149)	(57)
(Accretion) amortization on borrowings	(183)	209	(76)
Net deferred income tax expense	(7,495)	104	926
Stock-based compensation	2,949	2,942	1,884
Losses (gains) on sales of investment securities, net	(29)	280
Change in fair value of equity securities, net	(202)	(294)	267
Gains (losses) on sale of loans held-for-sale, net	(2,085)	(512)	(61)
Loans originated for resale	(63,114)	(20,499)	(4,121)
Loss on extinguishment of debt		1,047
Proceeds from sale of loans held-for-sale	80,323	21,011	4,552
Net (gains) losses on disposition of premises and equipment		(8)	26
Net (gains) losses on sale of other real estate owned		(8)	192
Increase in cash surrender value of bank owned life insurance	(4,793)	(3,484)	(3,094)
Amortization of premiums and accretion of discounts on investments securities, net	5,506	4,299	3,233
Amortization of subordinated debt issuance costs	323	329	332
Increase in accrued interest receivable	(11,458)	(301)	(2,744)
Net change in operating leases	41	1,312
Increase in other assets	(22,498)	(22,619)	(1,134)
(Decrease) increase in other liabilities	(4,174)	(2,785)	4,988
Net cash provided by operating activities	81,125	60,688	89,060
Investment securities available-for-sale:
Purchases	(338,087)	(225,853)	(140,013)
Sales	19,624	183,728
Maturities, calls and principal repayments	256,782	178,116	141,859
Net redemptions (purchases) of restricted investment in bank stocks	5,362	3,739	2,361
Purchases of equity securities	(2,000)
Sales of equity securities		569
Loans held-for-sale payments	1,186	47	159
Net increase in loans	(329,210)	(243,430)	(362,625)
Purchases of premises and equipment	(2,199)	(1,527)	(2,051)
Purchases of bank owned life insurance	(25,000)	(10,000)
Proceeds from life insurance death benefits	1,794		585
Proceeds from sale of premises and equipment		18	1,627
Cash and cash equivalents acquired in acquisitions, net	87,391	11,211
Proceeds from sale of other real estate owned	992	915	884
Net cash used in investing activities	(323,365)	(102,467)	(357,214)
Cash flows from financing activities
Net increase in deposits	410,605	260,489	297,021
Increase in subordinated debt	73,440		73,525
Advances of borrowings	1,526,489	2,597,000	1,733,000
Repayments of borrowings	(1,650,387)	(2,762,150)	(1,803,000)
Cash dividends paid on common stock	(14,317)	(12,160)	(9,664)
Purchase of treasury stock	(911)	(12,643)
Proceeds from exercise of stock options	233	360	875
Share redemption for tax withholdings on performance units and restricted stock units earned	(639)		(819)
Net cash provided by financing activities	344,513	70,896	290,938
Net change in cash and cash equivalents	102,273	29,117	22,784
Cash and cash equivalents at beginning of period	201,483	172,366	149,582
Cash and cash equivalents at end of period	303,756	201,483	172,366
Cash payments for:
Interest paid	74,701	88,522	55,662
Income taxes paid	18,497	18,497	9,092
Supplemental disclosures of noncash investing activities:
Transfer of loans to other real estate owned		907	538
Transfer of loan held-for-sale to loans held-for-investment	10,995		45,552
Transfer of loans held-for-investment to loans held-for-sale	26,548	33,297	21,236
Business combinations:
Fair value of net assets acquired, net of cash and cash equivalents	$ 949,282	$ 534,146