Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2015
OPERATING ACTIVITIES
Net income	$ 22,909,000	$ 20,095,000	$ 46,414,000	$ 45,534,000	$ 28,830,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization			8,039,000		6,945,000
Provision for loan losses	4,616,000	3,006,000	7,439,000		4,177,000
(Gain) loss on sale of available-for-sale securities			(4,088,000)		38,000
Net accretion of investment securities and assets not covered by FDIC loss share			(7,733,000)		(9,829,000)
Net amortization on borrowings			208,000		150,000
Stock-based compensation expense			1,719,000		1,077,000
Net accretion on assets covered by FDIC loss share					(119,000)
Loss on sale of premises and equipment, net of impairment			3,000,000		1,958,000
Gain on sale of foreclosed assets held for sale			(1,180,000)		(683,000)
Deferred income taxes			615,000		(1,772,000)
Increase in cash surrender value of bank owned life insurance	(826,000)	(746,000)	(1,824,000)		(1,318,000)
Originations of mortgage loans held for sale			(293,929,000)		(466,149,000)
Proceeds from sale of mortgage loans held for sale			293,665,000		439,320,000
Changes in assets and liabilities:
Interest receivable			1,643,000		2,377,000
Assets held in trading accounts			(2,899,000)		506,000
Other assets			17,239,000		(3,178,000)
Accrued interest and other liabilities			(11,088,000)		8,276,000
Income taxes payable			(3,142,000)		6,846,000
Net cash provided by operating activities			54,098,000		17,452,000
INVESTING ACTIVITIES
Net originations of loans not covered by FDIC loss share			(98,039,000)		(176,400,000)
Net collections of loans covered by FDIC loss share					16,888,000
Decrease in due from banks - time			4,326,000
Purchases of premises and equipment, net			(4,044,000)		(7,784,000)
Proceeds from sale of foreclosed assets held for sale			19,364,000		15,814,000
Proceeds from sale of foreclosed assets held for sale, covered by FDIC loss share					1,859,000
Proceeds from sale of available-for-sale securities			232,806,000		1,662,000
Proceeds from maturities of available-for-sale securities			61,164,000		291,688,000
Purchases of available-for-sale securities			(280,506,000)		(210,344,000)
Proceeds from maturities of held-to-maturity securities			79,976,000		116,439,000
Purchases of held-to-maturity securities			(6,162,000)		(54,668,000)
Proceeds from bank owned life insurance death benefits			1,876,000
Purchases of bank owned life insurance			(25,000)		(25,000)
Cash received on FDIC loss share					3,980,000
Cash received in business combinations, net of cash paid					201,029,000
Net cash provided by investing activities			10,736,000		200,138,000
FINANCING ACTIVITIES
Net change in deposits			(57,893,000)		(101,472,000)
Repayments of subordinated debentures			(594,000)
Dividends paid on preferred stock			(24,000)		(103,000)
Dividends paid on common stock			(14,514,000)		(13,174,000)
Net change in other borrowed funds			29,538,000		(134,106,000)
Net change in federal funds purchased and securities sold under agreements to repurchase			3,640,000		(15,024,000)
Net shares issued under stock compensation plans			4,210,000		2,850,000
Redemption of preferred stock			(30,852,000)
Net cash used in financing activities			(66,489,000)		(261,029,000)
DECREASE IN CASH AND CASH EQUIVALENTS			(1,655,000)		(43,439,000)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			252,262,000	292,470,000	335,909,000	$ 335,909,000
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 250,607,000	$ 292,470,000	$ 250,607,000	$ 252,262,000	$ 292,470,000	$ 252,262,000