CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 29,818	$ 18,431
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,961	3,774
Amortization of premiums and discounts on securities, net	2,864	6,381
Other amortization and accretion, net	(346)	(1,862)
Stock based compensation	3,787	3,275
Origination of loans designated for sale	(164,878)	(132,482)
Sale of loans designated for sale	161,587	140,998
Provision for loan losses	3,385	1,411
Deferred income taxes	15,077	9,107
Losses (gains) on sale of securities	26	(361)
Gain on sale of loans	(5,160)	(4,661)
Losses (gains) on sale and write-downs of other real estate owned	(657)	22
Losses on disposition of fixed assets	1,973	2,440
Changes in operating assets and liabilities, net of effects from acquired companies:
Net increase in other assets	(419)	(7,557)
Net increase (decrease) in other liabilities	(2,575)	3,494
Net cash provided by operating activities	48,443	42,410
CASH FLOWS FROM INVESTING ACTIVITIES
Maturity and paydowns on securities available for sale	176,978	94,135
Maturity and paydowns on securities held for investment	64,984	29,582
Proceeds from sale of securities available for sale	7,525	39,047
Purchases of securities available for sale	(223,805)	(159,576)
Purchases of securities held for investment	(67,563)	(218,654)
Maturity of time deposits with other banks	2,682	0
Net new loans and principal repayments	(277,142)	(253,221)
Proceeds from the sale of portfolio loans	74,211	33,593
Purchases of loans held for investment	(55,352)	(61,584)
Proceeds from the sale of other real estate owned	5,123	4,987
Proceeds from sale of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock	29,984	1,700
Purchase of FHLB and Federal Reserve Stock	(32,398)	(16,213)
Purchase of VISA Class B stock	(6,180)	0
Purchases of bank owned life insurance	(30,000)	0
Net cash from bank acquisition	30,225	235,546
Additions to bank premises and equipment	(4,247)	(5,100)
Net cash used in investing activities	(304,975)	(275,758)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	304,005	14,568
Net decrease in federal funds purchased and repurchase agreements	(62,049)	(4,312)
Net increase (decrease) in FHLB borrowings, maturing in 30 days or less	(26,000)	305,000
Early redemption of FHLB borrowings	0	(50,000)
Stock based employee benefit plans	569	(592)
Issuance of common stock, net of related expense	55,641	0
Dividends paid	0	0
Net cash provided by financing activities	272,166	264,664
Net increase in cash and cash equivalents	15,634	31,316
Cash and cash equivalents at beginning of period	109,644	136,067
Cash and cash equivalents at end of period	125,278	167,383
Supplemental disclosure of non cash investing activities:
Transfer from loans to other real estate owned	448	2,996
Transfer from bank premises to other real estate owned	1,212	7,708
Transfers from loans held for investment to loans held for sale	$ 5,664	$ 0