Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
OPERATING ACTIVITIES
Net income	$ 20,095,000	$ 9,908,000	$ 28,830,000	$ 14,261,000	$ 21,427,000
Items not requiring (providing) cash:
Depreciation and amortization			6,945,000	3,808,000
Provision for loan losses	3,006,000	1,602,000	4,177,000	2,510,000
Net (accretion) of investment securities and assets not covered by FDIC loss share			(9,829,000)	(1,994,000)
Net amortization on borrowings			150,000
Stock-based compensation expense			1,077,000	655,000
Net accretion on assets covered by FDIC loss share			(119,000)	(350,000)
Deferred income taxes			(1,772,000)	(3,143,000)
Loss (gain) on sale of available-for-sale securities			38,000	(38,000)
Gain on sale of premises and equipment				(2,296,000)
Loss on premises and equipment of closed branches			1,958,000
Bank owned life insurance income	(746,000)	(377,000)	(1,318,000)	(705,000)
Changes in:
Interest receivable			2,377,000	1,400,000
Mortgage loans held for sale			(26,829,000)	(10,915,000)
Assets held in trading accounts			506,000	2,097,000
Other assets			(3,178,000)	(5,982,000)
Accrued interest and other liabilities			8,276,000	4,113,000
Income taxes payable			6,846,000	(2,892,000)
Net cash provided by operating activities			18,135,000	529,000
INVESTING ACTIVITIES
Net originations of loans not covered by FDIC loss share			(176,400,000)	(34,126,000)
Net collections of loans covered by FDIC loss share			16,888,000	34,830,000
Proceeds from sale of student loans				22,136,000
Purchases (proceeds) from sale of premises and equipment, net			(7,784,000)	10,760,000
Proceeds from sale of foreclosed assets held for sale			15,131,000	13,575,000
Proceeds from sale of foreclosed assets held for sale, covered by FDIC loss share			1,859,000	7,677,000
Proceeds from sale of available-for-sale securities			1,662,000	2,552,000
Proceeds from maturities of available-for-sale securities			291,688,000	59,920,000
Purchases of available-for-sale securities			(210,344,000)	(118,954,000)
Proceeds from maturities of held-to-maturity securities			116,439,000	130,682,000
Purchases of held-to-maturity securities			(54,668,000)	(184,965,000)
Purchase of bank owned life insurance			(25,000)	(25,000)
Cash received on FDIC loss share			3,980,000	11,886,000
Cash received in business combinations, net of cash paid			201,029,000
Net cash provided by (used in) investing activities			199,455,000	(44,052,000)
FINANCING ACTIVITIES
Net change in deposits			(101,472,000)	(55,842,000)
Dividends paid on preferred stock			(103,000)
Dividends paid on common stock			(13,174,000)	(7,467,000)
Net change in other borrowed funds			(134,106,000)	(1,488,000)
Net change in federal funds purchased and securities sold under agreements to repurchase			(15,024,000)	(9,661,000)
Net shares issued under stock compensation plans			2,850,000	1,261,000
Net cash used in financing activities			(261,029,000)	(73,197,000)
DECREASE IN CASH AND CASH EQUIVALENTS			(43,439,000)	(116,720,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			335,909,000	539,380,000	539,380,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 292,470,000	$ 422,660,000	$ 292,470,000	$ 422,660,000	$ 335,909,000