CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 83,697	$ 43,929
Adjustments to net income:
Depreciation and amortization expense	5,487	3,378
Provision for credit losses	5,995	6,238
Share-based compensation expense	6,362	4,246
Loss on sale and disposal of premises and equipment	52	235
Loss (gain) on sale of or write down of other real estate owned	21	(94)
Net amortization on securities	5,326	5,693
Net accretion of deferred loan fees/costs and discounts/premiums for loans acquired	3,936	1,373
Gain on sale of investment securities available-for-sale	(1,399)	(2,989)
Originations of loans held for sale	(108,071)	(130,040)
Proceeds from the sales of and principal payments from loans held for sale	126,329	100,938
Gain on sale of loans	(8,830)	(9,137)
Deferred income tax expense	26,864	1,651
Change in accrued expenses and other liabilities, net	20,004	10,147
Income from bank owned life insurance, net	(2,038)	(1,349)
Amortization of core deposit intangible	8,963	4,033
Change in accrued interest receivable and other assets, net	(20,511)	1,664
Net cash provided by operating activities	152,187	39,916
Cash flows from investing activities:
Net decrease (increase) in interest-bearing time deposits with financial institutions	247	(493)
Proceeds from sale of other real estate owned	496	182
Increase in loans, net	(196,416)	(391,186)
Purchase of loans held for investment	(61,562)	(13,582)
Purchase of held-to-maturity securities	(29,002)	(10,924)
Principal payments on held-to-maturity securities	839	849
Purchase of securities available-for-sale	(390,459)	(157,773)
Principal payments on securities available-for-sale	(103,179)	(54,624)
Proceeds from sale or maturity of securities available-for-sale	394,536	248,043
Proceeds from bank owned life insurance death benefit	0	199
Purchases of premises and equipment	(9,365)	(2,421)
Change in FHLB, FRB, and other stock, at cost	(30,586)	(11,301)
Change in cash acquired in acquisitions, net	146,571	76,531
Net cash used in investing activities	(71,522)	(207,252)
Cash flows from financing activities:
Net (decrease) increase in deposit accounts	(90,653)	203,119
Net change in short-term borrowings	86,211	(74,344)
Repayment of long-term FHLB borrowings	(10,500)	0
Proceeds from exercise of stock options and warrants	1,911	4,325
Restricted stock surrendered and canceled	(1,586)	(1,259)
Net cash (used in) provided by financing activities	(14,617)	131,841
Net (decrease) increase in cash and cash equivalents	66,048	(35,495)
Cash and cash equivalents, beginning of period	197,164	156,857
Cash and cash equivalents, end of period	263,212	121,362
Supplemental cash flow disclosures:
Interest paid	33,290	12,696
Income taxes paid	27,806	1,405
Noncash investing activities during the period:
Transfers from loans to other real estate owned	15	0
Security settled (purchases) in subsequent period	(9,988)	18,755
Transfers from portfolio loans to loans held for sale	662	31,685
Assets acquired (liabilities assumed and capital created) in acquisitions (See Note 4):
Investment securities	392,858	442,923
FHLB and other stock	16,768	9,739
Loans	2,352,388	1,364,688
Core deposit intangible	71,943	28,123
Deferred income tax	4,536	11,623
Goodwill	312,239	268,075
Fixed assets	9,122	34,902
Other assets	80,478	45,475
Deposits	(2,506,929)	(1,669,550)
Other borrowings	(254,923)	(139,034)
Other liabilities	(24,859)	(8,352)
Common stock and additional paid-in capital	$ (601,172)	$ (464,982)