CONSOLIDATED STATEMENT 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	$ 98,739	$ 67,275	$ 42,865
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,421	6,353	5,614
Amortization of premiums and discounts on securities, net	2,548	3,196	3,977
Amortization of operating lease right-of-use assets	4,117
Other amortization and accretion, net	(2,005)	(1,158)	(697)
Stock based compensation	7,243	7,823	5,267
Origination of loans designated for sale	(329,177)	(303,928)	(213,027)
Sale of loans designated for sale	333,591	326,328	211,091
Provision for loan losses	10,999	11,730	5,648
Deferred income taxes	6,791	459	35,827
(Gains) losses on sale of securities	(1,031)	485	(86)
Gain on sale of VISA Class B stock	0	0	(15,153)
Gains on sale of loans	(9,794)	(8,961)	(7,038)
Gains on sale and write-downs of other real estate owned	(432)	(107)	(711)
Losses on disposition of fixed assets	511	1,235	2,270
Bank owned life insurance death benefits	(956)	(280)	0
Changes in operating assets and liabilities, net of effects from acquired companies:
Net (increase) decrease in other assets	(5,614)	10,331	(5,506)
Net (decrease) increase in other liabilities	(4,206)	8,827	(21,432)
Net Cash Provided by Operating Activities	117,745	129,608	48,909
Cash Flows From Investing Activities
Maturities and repayments of debt securities available-for-sale	101,674	141,223	211,173
Maturities and repayments of debt securities held-to-maturity	42,495	58,315	86,460
Proceeds from sale of debt securities available-for-sale	202,724	64,366	235,613
Purchases of debt securities available-for-sale	(309,461)	(104,650)	(371,926)
Purchases of debt securities held-to-maturity	0	0	(131,439)
Maturities of time deposits with other banks	4,501	4,310	4,720
Net new loans and principal repayments	(109,614)	(365,816)	(328,868)
Proceeds from the sale of portfolio loans	0	0	106,815
Purchases of loans held for investment	(270,791)	(19,541)	(55,352)
Proceeds from the sale of other real estate owned	6,509	10,072	6,069
Proceeds from sale of FHLB and Federal Reserve Bank Stock	74,120	44,731	48,295
Purchase of FHLB and Federal Reserve Bank Stock	(75,193)	(51,505)	(42,680)
Purchase of Visa Class B stock	0	0	(6,180)
Proceeds from sale of Visa Class B stock	0	21,333	0
Redemption of bank owned life insurance	14,218	4,232	3,609
Purchase of bank owned life insurance	0	0	(30,000)
Net cash from bank acquisitions	0	22,349	23,825
Additions to bank premises and equipment	(2,523)	(4,019)	(5,710)
Net Cash Used in Investing Activities	(321,341)	(174,600)	(245,576)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	407,513	(39,769)	333,049
Net (decrease) increase in federal funds purchased and repurchase agreements	(128,202)	(1,771)	11,892
Net (decrease) increase in FHLB borrowings with original maturities of three months or less	(67,000)	32,000	(204,000)
Repayments of FHLB borrowings with original maturities of more than three months	(63,000)	0	0
Proceeds from FHLB borrowings with original maturities of more than three months	65,000	60,000	0
Stock based employee benefit plans	(2,135)		(55)
Stock based employee benefit plans		979
Issuance of common stock, net of related expense	0	0	55,641
Dividends paid	0	0	0
Net Cash Provided by Financing Activities	212,176	51,439	196,527
Net increase (decrease) in cash and cash equivalents	8,580	6,447	(140)
Cash and cash equivalents at beginning of year	115,951	109,504	109,644
Cash and Cash Equivalents at End of Year	124,531	115,951	109,504
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	46,130	28,301	15,125
Cash paid during the period for taxes	16,000	13,200	400
New operating lease right-of-use assets	30,301
New operating lease liabilities	34,627
Supplemental disclosure of non cash investing activities:
Transfer of debt securities from held-to-maturity to available-for-sale	52,796	0	0
Transfer from loans to other real estate owned	5,665	5,549	1,774
Transfer from bank premises to other real estate owned	0	9,168	1,212
Transfer from loans held for investment to loans held for sale	$ 801	$ 0	$ 5,664