Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Operating Activities
Net income	$ 23,087	$ 20,049	$ 44,240	$ 32,366
Adjustments reconciling net income to net cash provided by operating activities:
Depreciation			4,649	4,631
Net losses on sale or disposal of premises and equipment			865	574
Provision for loan losses	2,205	889	4,041	1,570	$ 4,091
Net losses (gains) on sale of other real estate owned including write-downs			(266)	1,995
Share-based compensation expense			1,497	1,009
Amortization of intangible assets	1,013	1,319	2,049	2,339
Provision for deferred taxes			(1,781)	(3,394)
Net amortization of investment securities available for sale			3,201	3,113
Net gains on securities available for sale	(37)	0	(37)	(94)
Accretion of discount on purchased loans			(6,165)	(8,844)
Amortization of premium on purchased loan pools			2,109	2,593
Net accretion (amortization) of other borrowings			30	(33)
Amortization of subordinated deferrable interest debentures			661	795
Originations of mortgage loans held for sale			(711,398)	(641,667)
Payments received on mortgage loans held for sale			546	644
Proceeds from sales of mortgage loans held for sale			614,255	613,430
Net gains on sale of mortgage loans held for sale			(23,019)	(25,942)
Originations of SBA loans			(41,332)	(33,079)
Proceeds from sales of SBA loans			20,409	18,067
Net gains on sale of SBA loans			(2,724)	(1,745)
Increase in cash surrender value of BOLI			(781)	(776)
Changes in FDIC loss-share receivable/payable, net of cash payments received			1,449	4,033
Change attributable to other operating activities			19,174	12,374
Net cash used in operating activities			(68,328)	(16,041)
Investing Activities, net of effects of business combinations
Purchase of securities available for sale			(53,268)	(90,556)
Proceeds from prepayments and maturities of securities available for sale			54,969	56,262
Proceeds from sales of securities available for sale			3,090	46,731
Net increase in other investments			(7,187)	(7,597)
Net increase in loans, excluding purchased loans			(499,713)	(336,554)
Payments received on purchased loans			119,716	120,866
Purchases of loan pools			0	(94,707)
Payments received on purchased loan pools			71,471	74,652
Purchases of premises and equipment			(2,373)	(6,878)
Proceeds from sales of premises and equipment			0	161
Proceeds from sales of other real estate owned			7,535	9,818
Payments received from FDIC under loss-share agreements			230	4,165
Net cash proceeds paid in acquisitions			0	(7,205)
Net cash used in investing activities			(305,530)	(230,842)
Financing Activities, net of effects of business combinations
Net increase (decrease) in deposits			218,234	(101,118)
Net decrease in securities sold under agreements to repurchase			(35,105)	(26,446)
Proceeds from other borrowings			1,122,692	172,700
Repayment of other borrowings			(935,452)	(7)
Issuance of common stock			88,656	0
Proceeds from exercise of stock options			1,850	414
Dividends paid - common stock			(7,205)	(3,484)
Purchase of treasury shares			(886)	(1,211)
Net cash provided by financing activities			452,784	40,848
Net increase (decrease) in cash and cash equivalents			78,926	(206,035)
Cash and cash equivalents at beginning of period			198,385	390,563	390,563
Cash and cash equivalents at end of period	$ 277,311	$ 184,528	277,311	184,528	$ 198,385
Supplemental Disclosures of Cash Flow Information
Cash paid during the period for: Interest			13,048	8,801
Cash paid during the period for: Income taxes			16,030	17,395
Loans (excluding purchased loans) transferred to other real estate owned			3,347	1,499
Purchased loans transferred to other real estate owned			3,281	3,420
Loans transferred from loans held for sale to loans held for investment			102,421	61,960
Loans provided for the sales of other real estate owned			949	905
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			2,542	10,415
Change in unrealized gain (loss) on cash flow hedge (interest rate swap), net of tax			$ (63)	$ (808)