Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES
Net income	$ 37,411	$ 26,991	$ 12,003
Adjustments to reconcile net income to net cash from operating activities:
Net amortization and accretion of investments	1,892	1,258	1,293
Net amortization of deferred loan (fees) costs	1,692	(448)	(324)
Provision for loan losses	16,579	1,789	2,440
Depreciation and amortization	3,292	3,260	2,938
Stock-based compensation	2,353	1,759	1,267
Loans originated for sale	(1,334,910)	(1,604,825)	(1,214,078)
Proceeds of loans sold	1,477,063	1,611,889	1,237,402
Holding gain on equity securities	(374)	(13,767)	(590)
Mortgage fee income	(33,427)	(41,045)	(32,337)
Gain on sale of available-for-sale securities	(948)	(105)	(352)
Loss on sale of available-for-sale securities	34	271	25
Gain on sale of equity securities	(3,501)	0	0
Loss on sale of equity securities	0	7	0
Gain on sale of portfolio loans	(332)	(520)	(198)
Gains on acquisition and divestiture activity	(17,640)	0	0
Income on bank-owned life insurance, including death benefit proceeds in excess of cash surrender value	(888)	(1,197)	(1,182)
Deferred taxes	(3,386)	(3,953)	139
Amortization of operating lease right-of-use asset	86	10	0
Equity method investment income	(27,574)	0	0
Return on equity method investment	3,400	0	0
Other assets	(27,286)	(14,753)	(3,013)
Other liabilities	18,699	25,317	1,261
Net cash from operating activities	112,235	(8,062)	6,694
INVESTING ACTIVITIES
Purchases of investment securities available-for-sale	(269,790)	(70,984)	(31,068)
Maturities/paydowns of investment securities available-for-sale	64,493	33,583	25,748
Sales of investment securities available-for-sale	54,023	31,220	2,743
Purchases of premises and equipment, including premises and equipment included in assets of branches held-for-sale	(6,615)	(2,042)	(2,693)
Disposals of premises and equipment	1,687	0	0
Net increase in loans and loans included in assets of branches held-for-sale	(70,186)	(113,076)	(199,282)
Purchases of restricted bank stock	(25,831)	(49,600)	(29,370)
Redemptions of restricted bank stock	38,048	45,853	25,681
Proceeds from sale of certificates of deposit with banks	1,739	2,229	0
Purchases of certificates of deposit with banks	(993)	0	0
Proceeds from sale of other real estate owned	8,309	731	707
Purchase of bank-owned life insurance	(5,000)	(574)	(1,149)
Proceeds from death benefit of bank-owned life insurance policies	0	688	706
Purchase of equity securities	(9,918)	(1,400)	(2,000)
Sales of equity securities	4,622	5,968	0
Proceeds from divestitures	(136,005)	0	0
Cash paid for acquisitions	57,306	(2,651)	0
Net cash from investing activities	(294,111)	(120,055)	(209,977)
FINANCING ACTIVITIES
Net increase in deposits and deposits in branches held-for-sale	574,691	144,158	149,574
Net change in repurchase agreements	94	(4,753)	(7,478)
Net change in FHLB and other borrowings	(180,283)	7,998	62,718
Subordinated debt issuance (redemption)	40,000	(12,400)	0
Subordinated debt issuance and conversion costs	(717)	0	(35)
Common stock repurchased	(15,746)	0	0
Preferred stock redemption	0	(500)	0
Common stock options exercised	4,464	2,164	2,129
Cash dividends paid on common stock	(4,275)	(2,290)	(1,220)
Cash dividends paid on preferred stock	(461)	(479)	(489)
Net cash from financing activities	417,767	133,898	205,199
Net change in cash and cash equivalents	235,891	5,781	1,916
Cash and cash equivalents at beginning of period	28,002	22,221	20,305
Cash and cash equivalents at end of period	263,893	28,002	22,221
Business combination non-cash disclosures:
Assets acquired in business combinations (net of cash received)	87,722	3,389	0
Liabilities assumed in business combination	148,731	855	0
Supplemental disclosure of cash flow information:
Loans transferred to other real estate owned	800	115	1,369
Employee stock-based compensation tax withholding obligations	35	57	161
Restricted stock units vested	49	10	1
Common stock converted from subordinated debt	0	1,000	15,965
Initial recognition of operating lease right-of-use assets	0	12,935	0
Initial recognition of operating lease liabilities	0	15,659	0
Common stock issued related to Paladin acquisition	240	0	0
Cash payments for:
Interest on deposits, repurchase agreements and borrowings	12,271	22,970	17,277
Income taxes	$ 11,966	$ 3,962	$ 191