Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 36,047	$ 44,240
Adjustments reconciling net income to net cash provided by (used in) operating activities:
Depreciation	4,546	4,649
Net losses on sale or disposal of premises and equipment including write-downs	91	865
Provision for loan losses	10,911	4,041
Net losses (gains) on sale of other real estate owned including write-downs	385	(266)
Share-based compensation expense	4,151	1,497
Amortization of intangible assets	3,186	2,049
Provision for deferred taxes	(1,448)	(1,781)
Net amortization of investment securities available for sale	2,896	3,201
Net loss (gain) on securities	86	(37)
Accretion of discount on purchased loans	(4,340)	(6,165)
Amortization of premium on purchased loan pools	1,016	2,109
Accretion on other borrowings	65	30
Accretion on subordinated deferrable interest debentures	661	661
Originations of mortgage loans held for sale	(882,484)	(711,398)
Payments received on mortgage loans held for sale	773	546
Proceeds from sales of mortgage loans held for sale	778,216	614,255
Net gains on sale of mortgage loans held for sale	(16,860)	(23,019)
Originations of SBA loans	(16,246)	(41,332)
Proceeds from sales of SBA loans	21,038	20,409
Net gains on sale of SBA loans	(1,840)	(2,724)
Increase in cash surrender value of bank owned life insurance	(782)	(781)
Changes in FDIC loss-share payable, net of cash payments received	1,611	1,449
Change attributable to other operating activities	2,856	19,174
Net cash used in operating activities	(55,465)	(68,328)
Investing Activities, net of effects of business combinations
Purchases of securities available for sale	(155,476)	(53,268)
Proceeds from prepayments and maturities of securities available for sale	69,948	54,969
Proceeds from sales of securities available for sale	46,437	3,090
Net decrease (increase) in other investments	9,171	(7,187)
Net increase in loans, excluding purchased loans	(361,575)	(499,713)
Payments received on purchased loans	108,727	119,716
Payments received on purchased loan pools	37,742	71,471
Purchases of premises and equipment	(3,066)	(2,373)
Proceeds from sales of premises and equipment	507	0
Proceeds from sales of other real estate owned	5,875	7,535
Payments paid to FDIC under loss-share agreements	(1,017)	230
Net cash proceeds paid in acquisitions	52,016	0
Net cash used in investing activities	(190,711)	(305,530)
Financing Activities, net of effects of business combinations
Net increase (decrease) in deposits	(28,861)	218,234
Net decrease in securities sold under agreements to repurchase	(19,636)	(35,105)
Proceeds from other borrowings	1,150,000	1,122,692
Repayment of other borrowings	(753,579)	(935,452)
Issuance of common stock	0	88,656
Proceeds from exercise of stock options	846	1,850
Dividends paid - common stock	(7,558)	(7,205)
Purchase of treasury shares	(985)	(886)
Net cash provided by financing activities	340,227	452,784
Net increase in cash and cash equivalents	94,051	78,926
Cash and cash equivalents at beginning of period	330,658	198,385
Cash and cash equivalents at end of period	424,709	277,311
Cash paid during the period for:
Interest	23,213	13,048
Income taxes	4,018	16,030
Loans (excluding purchased loans) transferred to other real estate owned	1,691	3,347
Purchased loans transferred to other real estate owned	536	3,281
Loans transferred from loans held for sale to loans held for investment	180,750	102,421
Loans transferred from loans held for investment to loans held for sale	2,796	0
Loans provided for the sales of other real estate owned	53	949
Assets acquired in business acquisitions	3,058,197	0
Liabilities assumed in business acquisitions	2,408,837	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	(11,585)	2,542
Change in unrealized gain (loss) on cash flow hedge, net of tax	$ 294	$ (63)