Consolidated Statements of Cash Flows - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 92,739	$ 89,217	$ 48,190
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,719	3,532	3,281
Provision for loan losses	6,372	6,644	10,130
Deferred income taxes	5,800	3,307	21,105
Net amortization of debt securities	2,973	1,691	2,415
Amortization of intangible assets	5,543	2,503	2,609
Mortgage loans originated-for-sale	(81,941)	(36,229)	(138,949)
Proceeds from mortgage loans sold	77,302	39,310	145,836
Gain on sale of investment securities	49	(9)	(22)
Valuation adjustments and sale of other real estate	(113)	(13)	(93)
Sale of state tax credits	(2,549)	(2,820)	(2,581)
Share-based compensation	4,032	3,452	3,427
Net accretion of loan discount	(10,494)	(1,700)	(5,609)
Changes in other assets and liabilities, net	(12,975)	(77)	(43,948)
Net cash provided by operating activities	92,457	108,808	45,791
Cash flows from investing activities:
Net cash paid for acquisitions and dispositions	(23,377)	0	4,456
Net increase in loans	(284,235)	(257,872)	(270,090)
Sale of debt securities, available-for-sale	357,976	1,451	144,076
Paydown or maturity of debt securities, available-for-sale	146,132	84,189	143,949
Paydown or maturity of debt securities, held-to-maturity	7,447	6,397	6,510
Redemption of other investments	61,917	50,274	43,207
Sale of state tax credits held for sale	14,689	14,718	15,314
Sale of other real estate	4,798	875	2,779
Settlement of bank-owned life insurance policies	0	1,256	0
Payments for the purchase of:
Available for sale debt securities	(577,211)	(172,026)	(325,393)
Other investments	(68,963)	(51,828)	(56,412)
State tax credits held for sale	(11,356)	(6,017)	(18,294)
Fixed assets	(6,337)	(3,035)	(2,546)
Net cash used in investing activities	(378,520)	(331,618)	(312,444)
Cash flows from financing activities:
Net increase (decrease) in noninterest-bearing deposit accounts	57,551	(23,189)	96,681
Net increase in interest-bearing deposit accounts	44,300	454,760	61,204
Proceeds (repayments) from short-term FHLB advances, net	95,500	(102,500)	172,500
Proceeds from long-term FHLB advances	50,000	0	0
Proceeds from Notes Payable	41,000	2,000	10,000
Repayments of Notes Payable	(8,714)	0	(10,000)
Net increase (decrease) in other borrowings	9,436	(32,224)	(79,417)
Cash dividends paid on common stock	(16,568)	(10,845)	(10,249)
Payments for Repurchase of Common Stock	(15,526)	(19,387)	(16,636)
Payments for Repurchase of Equity	(212)	(2,576)	(2,909)
Net cash provided by financing activities	256,767	266,039	221,174
Net (decrease) increase in cash and cash equivalents	(29,296)	43,229	(45,479)
Cash and cash equivalents, beginning of period	196,552	153,323	198,802
Cash and cash equivalents, end of period	167,256	196,552	153,323
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	65,667	45,650	24,610
Cash paid during the period for income taxes	13,582	10,136	12,449
Noncash transactions:
Real Estate Owned, Transfer to Real Estate Owned	8,148	876	564
Sales of other real estate financed	621	0	0
Transfer of securities from available-for-sale to held-to-maturity	116,303	0	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 5,208	$ 0	$ 0
Stock Issued During Period, Shares, Acquisitions	171,885	0	141,729