Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Operating Activities
Net income	$ 20,158	$ 21,557	$ 64,398	$ 53,923
Adjustments reconciling net income to net cash provided by operating activities:
Depreciation			6,918	7,041
Net losses on sale or disposal of premises and equipment			956	112
Provision for loan losses	1,787	811	5,828	2,381	$ 4,091
Net losses on sale of other real estate owned including write-downs			501	1,844
Share-based compensation expense			2,419	1,586
Amortization of intangible assets	941	993	2,990	3,332
Provision for deferred taxes			(962)	(6,369)
Net amortization of investment securities available for sale			4,815	5,086
Net gains on securities available for sale	0	0	(37)	(94)
Accretion of discount on purchased loans			(9,023)	(12,926)
Amortization of premium on purchased loan pools			2,943	4,149
Net accretion (amortization) on other borrowings			62	(57)
Amortization of subordinated deferrable interest debentures			992	1,123
Originations of mortgage loans held for sale			(1,113,188)	(1,051,812)
Payments received on mortgage loans held for sale			799	1,167
Proceeds from sales of mortgage loans held for sale			961,831	982,898
Net gains on sale of mortgage loans held for sale			(36,451)	(41,935)
Originations of SBA loans			(25,720)	(57,462)
Proceeds from sales of SBA loans			23,952	21,656
Net gains on sale of SBA loans			(3,423)	(3,054)
Increase in cash surrender value of BOLI			(1,188)	(1,318)
Changes in FDIC loss-share receivable/payable, net of cash payments received			1,974	10,277
Change attributable to other operating activities			12,931	16,202
Net cash used in operating activities			(95,683)	(62,250)
Investing Activities, net of effects of business combinations
Purchase of securities available for sale			(83,090)	(134,786)
Proceeds from prepayments and maturities of securities available for sale			85,036	93,513
Proceeds from sales of securities available for sale			3,090	53,026
Net increase in other investments			(12,669)	(13,050)
Net increase in loans, excluding purchased loans			(786,548)	(556,182)
Payments received on purchased loans			155,033	186,319
Purchases of loan pools			0	(151,481)
Payments received on purchased loan pools			95,533	115,409
Purchases of premises and equipment			(3,016)	(8,250)
Proceeds from sales of premises and equipment			16	207
Proceeds from sales of other real estate owned			11,989	18,329
Payments received from (payments to) FDIC under loss-share agreements			(97)	4,770
Net cash proceeds paid in acquisitions			0	(7,205)
Net cash used in investing activities			(534,723)	(399,381)
Financing Activities, net of effects of business combinations
Net increase in deposits			320,341	25,448
Net decrease in securities sold under agreements to repurchase			(39,349)	(20,938)
Proceeds from other borrowings			1,687,692	339,500
Repayment of other borrowings			(1,371,503)	(53,513)
Issuance of common stock			88,656	0
Proceeds from exercise of stock options			1,912	963
Dividends paid - common stock			(10,927)	(5,096)
Purchase of treasury shares			(886)	(1,225)
Net cash provided by financing activities			675,936	285,139
Net increase (decrease) in cash and cash equivalents			45,530	(176,492)
Cash and cash equivalents at beginning of period			198,385	390,563	390,563
Cash and cash equivalents at end of period	$ 243,915	$ 214,071	243,915	214,071	$ 198,385
Cash paid during the period for:
Interest			23,369	13,791
Income taxes			28,212	30,969
Loans (excluding purchased loans) transferred to other real estate owned			4,043	2,101
Purchased loans transferred to other real estate owned			4,294	6,262
Loans transferred from loans held for sale to loans held for investment			165,352	94,601
Loans provided for the sales of other real estate owned			1,334	1,471
Assets acquired in business acquisitions			0	561,440
Liabilities assumed in business acquisitions			0	465,048
Issuance of common stock in acquisitions			0	72,455
Issuance of common stock in exchange for equity investment in US Premium Finance Holding Company			5,844	0
Change in unrealized gain (loss) on securities available for sale, net of tax			4,337	7,724
Change in unrealized gain (loss) on cash flow hedge, net of tax			$ (38)	$ (567)