Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows From Operating Activities
Net Income (Loss)	$ 98,827	$ 81,574	$ 60,016
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (recapture) for loan and lease losses	8,591	6,727	(101)
Stock-based compensation expense	4,090	2,859	2,844
Depreciation, amortization and accretion	30,312	44,459	40,431
Investment securities gain, net	(1,581)	(552)	(462)
Net realized (gain) loss on sale of other assets	573	564	(48)
Net gain on sale and valuation adjustments of OREO	2,152	1,870	8,504
Net realized gain on sale of branches	0	(565)	0
Originations of loans held for sale	(75,689)	(23,344)	(43,046)
Proceeds from Sale of Loans Held-for-sale	72,296	23,573	44,874
Deferred income tax expense (benefit)	6,367	14,646	5,413
Net change in:
Interest receivable	(75)	(944)	(7,938)
Interest payable	(142)	89	(122)
Other assets	(5,419)	(4,479)	(3,385)
Other liabilities	(1,242)	(5,119)	(10,336)
Net cash provided by operating activities	134,756	137,618	79,636
Cash Flows From Investing Activities
Payments for (Proceeds from) Loans and Leases	(384,321)	(440,376)	(161,827)
Purchases of securities available for sale	(467,631)	(363,693)	(457,985)
Purchases of premises and equipment	(7,581)	(12,485)	(13,133)
Payments to Acquire Federal Home Loan Bank Stock	(16,760)	0	0
Proceeds from FDIC for reimbursement on loss-sharing asset	4,659	5,950	9,246
Proceeds from sales of securities available for sale	95,375	63,292	166,881
Proceeds from principal repayments and maturities of securities available for sale	283,206	180,648	293,940
Proceeds from sales of loans held for investment and other assets	15,074	2,840	2,917
Proceeds from Sale of Federal Home Loan Bank Stock	37,403	1,288	1,114
Proceeds from sales of other real estate and other personal property owned	19,387	28,559	36,453
Payment to FDIC Related to Loss-Sharing Asset	(1,865)	(3,451)	0
Capital improvements on other real estate properties	0	0	(3,577)
Payments to Acquire Intangible Assets	0	0	(919)
Net cash paid in branch sale	0	(16,788)	0
Net cash received (paid) in business combinations	0	32,255	(154,170)
Net cash used in investing activities	(423,054)	(521,961)	(281,060)
Cash Flows From Financing Activities
Net increase (decrease) in deposits	514,107	250,629	33,983
Net increase (decrease) in repurchase agreements	(5,381)	21,037	0
Proceeds from exercise of stock options	1,258	929	1,092
Proceeds from Warrant Exercises	0	5,000	0
Proceeds from Federal Home Loan Bank advances	1,702,000	1,602,000	1,215,100
Proceeds from Federal Reserve Bank borrowings	1,010	800	50
Repayment of Federal Home Loan Bank advances	(1,850,000)	(1,422,000)	(1,313,000)
Repayment of Federal Reserve Bank borrowings	(1,010)	(800)	(50)
Payment of preferred stock dividends	(137)	(96)	(32)
Payment of common stock dividends	(77,263)	(49,494)	(19,858)
Repayment of other borrowings	(8,248)	(14,636)	(51,000)
Purchase and retirement of common stock	(906)	(622)	(429)
Proceeds from excess tax benefit from stock-based compensation	0	(205)	(1,203)
Net cash provided by (used in) financing activities	275,430	392,952	(132,941)
Increase (decrease) in cash and cash equivalents	(12,868)	8,609	(334,365)
Cash and cash equivalents at beginning of period	188,170	179,561	513,926
Supplemental Information:
Cash paid for interest	4,146	3,904	5,962
Cash paid for income tax	30,522	21,230	26,754
Non-cash investing and financing activities
Loans transferred to other real estate owned	8,688	10,200	18,100
Share-based consideration issued in business combinations	$ 0	$ 116,907	$ 276,181