Condensed Consolidated Statements of Cash Flows - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 99,473	$ 75,437	$ 49,219
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	21,470	21,180	17,495
Provision for loan losses	5,864	6,590	1,886
Deferred income taxes	7,048	25,805	2,067
Other-than-temporary impairment on securities	489
Loss on sale of securities		2
Share-based compensation expense	5,803	3,908	3,322
Amortization on FDIC indemnification asset	8,587	21,895	29,535
Accretion of discount related to performing acquired loans	(6,638)	(10,247)	(6,725)
Loss on disposals of premises and equipment	576	1,390	4
Gain on sale of OREO	(1,674)	(7,561)	(13,357)
Net amortization of premium on investment securities	4,415	4,091	3,917
OREO write downs	9,428	10,685	8,109
Fair Value adjustment for loans held for sale	515
Originations and purchases of mortgage loans for sale	(844,401)	(746,042)	(846,772)
Proceeds from mortgage loans for sale	864,171	716,346	901,330
Net change in:
Accrued interest receivable	(717)	(3,361)	953
Prepaid assets	(876)	5,214	1,738
FDIC indemnification asset	9,173	42,391	52,081
Miscellaneous other assets	(4,861)	(4,687)	(3,320)
Accrued interest payable	(2,121)	(2,421)	(3,916)
Accrued income taxes	13,095	(20,809)	40,317
Miscellaneous other liabilities	(1,951)	(21,159)	4,522
Net cash provided by operating activities	186,868	118,647	242,405
Cash flows from investing activities:
Proceeds from sales of investment securities available for sale		9,315	177,468
Proceeds from maturities and calls of investment securities held to maturity	345	2,265	3,014
Proceeds from maturities of investment securities available for sale	223,750	151,888	142,163
Proceeds from calls of other investment securities	1,392
Proceeds from sales of other investment securities	233	3,279	17,019
Purchases of investment securities available for sale	(436,081)	(167,334)	(286,912)
Purchases of other investment securities		(8,318)
Net increase in loans	(316,136)	(73,639)	133,475
Net cash received from branch acquisitions	403,548		173,503
Purchases of premises and equipment	(15,225)	(16,108)	(13,751)
Proceeds from sale of credit card loans		20,350
Proceeds from sale of OREO	35,120	64,883	72,380
Proceeds from sale of premises and equipment	39	3,922	64
Net cash provided by investing activities	(103,015)	(9,497)	418,423
Cash flows from financing activities:
Net increase (decrease) in deposits	201,097	(94,455)	(264,673)
Net increase in federal funds purchased and securities sold under agreements to repurchase and other short-term borrowings	66,691	10,140	(27,220)
Repayment of FHLB advances and other borrowings	(46,398)	(1,187)	(255,443)
Common stock issuance	908	826	781
Preferred stock repurchase		(65,000)
Common stock repurchase	(5,631)	(917)	(933)
Dividends paid on preferred stock		(1,073)	(1,354)
Dividends paid on common stock	(23,710)	(19,785)	(15,274)
Stock options exercised	1,115	709	1,885
Net cash provided by (used in) financing activities	194,072	(170,742)	(562,231)
Net increase in cash and cash equivalents	277,925	(61,592)	98,597
Cash and cash equivalents at beginning of period	417,869	479,461	380,864
Cash and cash equivalents at end of period	695,794	417,869	479,461
Cash paid for:
Interest	12,449	16,739	14,063
Income taxes	31,375	36,017	16,358
Acquisitions:
Fair value of tangible assets acquired			3,018,522
Other intangible assets acquired			59,931
Liabilities assumed			2,847,637
Net identifiable assets acquired over (under) liabilities assumed			$ 230,816
Common stock issued in acquisition			381,423
Preferred stock issued in acquisition			65,000
Real estate acquired in full or in partial settlement of loans (covered of $9,283, $16,555 and $20,559, respectively; and non-covered of $21,419, $29,260 and $33,761, respectively)	$ 30,702	$ 45,815	$ 54,320