Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash Flows From Operating Activities
Net Income (Loss)	$ 81,574		$ 60,016		$ 46,143
Adjustments to reconcile net income to net cash provided by operating activities:
Provision (recapture) for loan and lease losses	6,727		(101)		39,367
Stock-based compensation expense	2,859		2,844		1,622
Depreciation, amortization and accretion	44,459		40,431		57,305
Net realized gain on sale of securities	(552)		(462)		(3,733)
Net realized (gain) loss on sale of other assets	564		(48)		(456)
Net realized (gain) loss on sale of other real estate owned	(5,909)		(10,539)		(11,634)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	(565)		0		0
Write-down on other real estate owned	4,039		2,035		8,300
Deferred income tax expense (benefit)	14,646		5,413		(3,656)
Net change in:
Loans held for sale	229		1,828		(415)
Interest receivable	(944)		(7,938)		1,019
Interest payable	89		(122)		(629)
Other assets	(4,479)		(3,385)		(2,113)
Other liabilities	(5,119)		(10,336)		3,779
Net cash provided by operating activities	137,618		79,636		134,899
Cash Flows From Investing Activities
Payments for (Proceeds from) Loans and Leases	(440,376)		(161,827)		(92,088)
Purchases of securities available for sale	(363,693)		(457,985)		(322,342)
Purchases of premises and equipment	(12,485)		(13,133)		(17,137)
Proceeds from FDIC reimbursement on loss-sharing asset	5,950		9,246		54,649
Proceeds from sales of securities available for sale	63,292		166,881		95,165
Proceeds from principal repayments and maturities of securities available for sale	180,648		293,940		236,749
Proceeds from sales of loans held for investment and other assets	4,128		4,031		4,414
Proceeds from sales of other real estate and other personal property owned	28,559	[1]	36,453	[1]	49,004	[1]
Payment to FDIC Related to Loss-Sharing Asset	(3,451)		0		0
Capital improvements on other real estate properties	0		(3,577)		(11)
Payments to Acquire Intangible Assets	0		(919)		0
Disposal Group, Not Discontinued Operation, Cash paid in disposal of assets	(16,788)		0		0
Net cash acquired in business combinations	32,255		(154,170)		0
Net cash (used in) provided by investing activities	(521,961)		(281,060)		8,403
Cash Flows From Financing Activities
Net increase (decrease) in deposits	250,629		33,983		226,556
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	21,037		0		0
Proceeds from exercise of stock options	929		1,092		713
Proceeds from Warrant Exercises	5,000		0		0
Proceeds from Federal Home Loan Bank advances	1,602,000		1,215,100		100
Proceeds from Federal Reserve Bank borrowings	800		50		100
Repayment of Federal Home Loan Bank advances	(1,422,000)		(1,313,000)		(112,210)
Repayment of Federal Reserve Bank borrowings	(800)		(50)		(100)
Payment of preferred stock dividends	(96)		(32)		0
Payment of common stock dividends	(49,494)		(19,858)		(38,824)
Repayments of Other Debt	(14,636)	[1]	(51,000)	[1]	0	[1]
Payment for purchase and retirement of common stock	(622)		(429)		0
Proceeds from excess tax benefit from stock-based compensation	205		1,203		0
Net cash used in financing activities	392,952		(132,941)		76,335
Increase (decrease) in cash and cash equivalents	8,609		(334,365)		219,637
Cash and cash equivalents at beginning of period	179,561		513,926		294,289
Cash and cash equivalents at end of period	188,170		179,561		513,926
Supplemental Information:
Cash paid for interest	3,904		5,962		10,206
Cash paid for income tax	21,230		26,754		11,927
Non-cash investing activities
Loans transferred to other real estate owned	10,200		18,100		21,627
Stock Issued	$ 116,907		$ 276,181		$ 0

[1] Reclassified to conform to the current period’s presentation. The reclassification was limited to removing the separate line item for sales of covered other real estate owned and including the prior period activity in the line item for sales of other real estate and other personal property owned as well as removing the separate line item for repayment of long-term subordinated debt and including prior period activity in the line item for repayment of other borrowings.