CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 51,313	$ 29,818
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,691	3,961
Amortization of premiums and discounts on securities, net	2,567	2,864
Other amortization and accretion, net	185	(346)
Stock based compensation	5,603	3,787
Origination of loans designated for sale	(225,929)	(164,878)
Sale of loans designated for sale	239,316	161,587
Provision for loan losses	9,388	3,385
Deferred income taxes	5,675	15,077
Losses on sale of securities	0	26
Gains on sale of loans	(7,752)	(5,160)
Gains on sale and write-downs of other real estate owned	(12)	(657)
Losses on disposition of fixed assets	216	1,973
Changes in operating assets and liabilities, net of effects from acquired companies:
Net decrease (increase) in other assets	17,281	(419)
Net increase (decrease) in other liabilities	3,644	(2,575)
Net cash provided by operating activities	106,186	48,443
CASH FLOWS FROM INVESTING ACTIVITIES
Maturities and repayments of debt securities available for sale	107,728	176,978
Maturities and repayments of debt securities held to maturity	48,945	64,984
Proceeds from sale of debt securities available for sale	0	7,525
Purchases of debt securities available for sale	(104,650)	(223,805)
Purchases of debt securities held to maturity	0	(67,563)
Maturities of time deposits with other banks	2,740	2,682
Net new loans and principal repayments	(225,570)	(277,142)
Purchase of loans held for investment	(19,541)	(55,352)
Proceeds from the sale of portfolio loans	0	74,211
Proceeds from the sale of other real estate owned	9,260	5,123
Proceeds from sale of FHLB and Federal Reserve Bank Stock	28,751	29,984
Purchase of FHLB and Federal Reserve Bank Stock	(33,681)	(32,398)
Purchase of VISA Class B stock	0	(6,180)
Redemption of bank owned life insurance	4,232	0
Purchase of bank owned life insurance	0	(30,000)
Net cash from bank acquisition	0	30,225
Additions to bank premises and equipment	(3,557)	(4,247)
Net cash used in investing activities	(185,343)	(304,975)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	50,790	304,005
Net decrease in federal funds purchased and repurchase agreements	(27,059)	(62,049)
Net increase (decrease) in FHLB borrowings	50,000	(26,000)
Issuance of common stock, net of related expense	0	55,641
Stock based employee benefit plans	1,016	569
Dividends paid	0	0
Net cash provided by financing activities	74,747	272,166
Net increase (decrease) in cash and cash equivalents	(4,410)	15,634
Cash and cash equivalents at beginning of period	109,504	109,644
Cash and cash equivalents at end of period	105,094	125,278
Supplemental disclosure of non cash investing activities:
Transfers from loans to other real estate owned	4,271	448
Transfers from bank premises to other real estate owned	2,052	1,212
Transfers from loans held for investment to loans held for sale	$ 0	$ 5,664