Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 84,722	$ 51,746
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,575	3,816
Amortization	3,236	1,932
Earnings attributable to noncontrolling interest	(52)	16
Provision for loan and lease losses	10,623	6,887
Provision for losses on foreclosed assets	2,427	863
Net (accretion) amortization of investment securities AFS	(51)	301
Net gains on investment securities AFS	(2,618)	(23)
Originations of mortgage loans held for sale	(136,267)	(90,110)
Proceeds from sales of mortgage loans held for sale	127,302	83,337
Accretion of purchased loans	(68,622)	(42,013)
Net amortization of FDIC loss share receivable and FDIC clawback payable	0	49
Gains on sales of other assets	(5,385)	(2,422)
Gain on merger and acquisition transaction	0	(4,667)
Prepayment penalty on Federal Home Loan Bank of Dallas advances	2,480	0
Deferred income tax expense (benefit)	2,252	(3,407)
Increase in cash surrender value of BOLI	(3,119)	(2,408)
BOLI death benefits in excess of cash surrender value	(2,289)	0
Stock-based compensation expense	4,220	3,050
Excess tax benefit on stock-based compensation	(791)	(1,373)
Changes in assets and liabilities:
Accrued interest receivable	(4,420)	(2,049)
Other assets, net	28,658	3,449
Accrued interest payable and other liabilities	(1,951)	13,094
Net cash provided by operating activities	44,930	20,068
Cash flows from investing activities:
Proceeds from sales of investment securities AFS	32,777	48,394
Proceeds from maturities/calls/paydowns of investment securities AFS	81,532	29,706
Purchases of investment securities AFS	(37,522)	(35,109)
Net increase of non-purchased loans and leases	(800,061)	(539,695)
Payments received on purchased loans	462,027	207,403
Payments received from FDIC under loss share agreements	0	16,076
Other net decreases in assets covered by FDIC loss share agreements and FDIC loss share receivable	0	9,246
Purchases of premises and equipment	(9,720)	(4,586)
Purchase of BOLI	(85,000)	0
Proceeds from BOLI death benefits	3,149	0
Proceeds from sales of other assets	40,018	30,166
Cash invested in unconsolidated investments	(639)	(2,320)
Net cash received in merger and acquisition transactions	274,235	121,918
Net cash used by investing activities	(39,204)	(118,801)
Cash flows from financing activities:
Net increase in deposits	406,269	41,190
Net repayments of other borrowings	(31,404)	(464)
Net increase (decrease) in repurchase agreements with customers	4,434	(13,619)
Proceeds from exercise of stock options	997	1,572
Excess tax benefit on stock-based compensation	791	1,373
Cash dividends paid on common stock	(22,126)	(16,606)
Net cash provided by financing activities	358,961	13,446
Net increase (decrease) in cash and cash equivalents	364,687	(85,287)
Cash and cash equivalents - beginning of period	150,203	195,975
Cash and cash equivalents - end of period	$ 514,890	$ 110,688