Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income	$ 77,491	$ 64,398
Adjustments reconciling net income to net cash provided by (used in) operating activities:
Depreciation	7,359	6,918
Net losses on sale or disposal of premises and equipment including write-downs	78	956
Provision for loan losses	13,006	5,828
Net losses (gains) on sale of other real estate owned including write-downs	947	501
Share-based compensation expense	5,433	2,419
Amortization of intangible assets	5,862	2,990
Provision for deferred taxes	1,023	(962)
Net amortization of investment securities available for sale	3,909	4,815
Net loss (gain) on securities	38	(37)
Accretion of discount on purchased loans	(8,083)	(9,023)
Amortization of premium on purchased loan pools	1,473	2,943
Accretion on other borrowings	98	62
Accretion on subordinated deferrable interest debentures	1,001	992
Originations of mortgage loans held for sale	(1,361,509)	(1,113,188)
Payments received on mortgage loans held for sale	840	799
Proceeds from sales of mortgage loans held for sale	1,188,493	961,831
Net gains on sale of mortgage loans held for sale	(28,236)	(36,451)
Originations of SBA loans	(18,032)	(25,720)
Proceeds from sales of SBA loans	27,275	23,952
Net gains on sale of SBA loans	(2,246)	(3,423)
Increase in cash surrender value of bank owned life insurance	(1,311)	(1,188)
Changes in FDIC loss-share payable, net of cash payments received	1,823	1,974
Change attributable to other operating activities	(10,268)	12,931
Net cash used in operating activities	(93,536)	(95,683)
Investing Activities, net of effects of business combinations
Purchases of securities available for sale	(234,711)	(83,090)
Proceeds from prepayments and maturities of securities available for sale	112,119	85,036
Proceeds from sales of securities available for sale	68,727	3,090
Net decrease (increase) in other investments	12,040	(12,669)
Net increase in loans, excluding purchased loans	(437,513)	(786,548)
Payments received on purchased loans	208,910	155,033
Payments received on purchased loan pools	60,042	95,533
Purchases of premises and equipment	(7,335)	(3,016)
Proceeds from sales of premises and equipment	576	16
Proceeds from sales of other real estate owned	7,461	11,989
Payments paid to FDIC under loss-share agreements	(1,205)	(97)
Net cash and cash equivalents received in acquisitions	51,495	0
Net cash used in investing activities	(159,394)	(534,723)
Financing Activities, net of effects of business combinations
Net increase in deposits	389,884	320,341
Net decrease in securities sold under agreements to repurchase	(16,567)	(39,349)
Proceeds from other borrowings	1,530,000	1,687,692
Repayment of other borrowings	(1,338,917)	(1,371,503)
Issuance of common stock	0	88,656
Proceeds from exercise of stock options	846	1,912
Dividends paid - common stock	(11,655)	(10,927)
Purchase of treasury shares	(2,062)	(886)
Net cash provided by financing activities	551,529	675,936
Net increase in cash and cash equivalents	298,599	45,530
Cash and cash equivalents at beginning of period	330,658	198,385
Cash and cash equivalents at end of period	629,257	243,915
Cash paid during the period for:
Interest	45,535	23,369
Income taxes	10,252	28,212
Loans (excluding purchased loans) transferred to other real estate owned	3,764	4,043
Purchased loans transferred to other real estate owned	2,434	4,294
Loans transferred from loans held for sale to loans held for investment	10,817	0
Loans transferred from loans held for investment to loans held for sale	8,831	0
Loans provided for the sales of other real estate owned	53	1,334
Assets acquired in business acquisitions	3,059,856	0
Liabilities assumed in business acquisitions	2,410,453	0
Issuance of common stock in acquisitions	547,127	0
Issuance of common stock in exchange for equity investment in US Premium Finance Holding Company	0	5,844
Change in unrealized gain (loss) on securities available for sale, net of tax	(15,590)	4,337
Change in unrealized gain (loss) on cash flow hedge, net of tax	$ 294	$ (38)