Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Net income	$ 97,998	$ 35,776
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	37,839	26,384
Provision for loan and lease losses	51,000	88,000
Realized gain on available-for-sale securities, net	(1,633)	(1,524)
Deferred income tax expense	20,485	1,487
Gain on sale of loans and leases	(14,084)	(9,423)
Gain on sale of foreclosed assets	(2,681)	(917)
Mortgage loans originated for sale	(404,902)	(234,653)
Proceeds from sale of mortgage loans originated for sale	404,473	233,969
Payments received on loans and leases transferred from held for sale to held for investment, net of (advances) on home equity lines of credit	12,566	107,211
Increase in cash surrender value of bank-owned life insurance	(4,347)	(2,256)
(Increase) decrease in accrued interest receivable	(2,511)	763
Increase (decrease) in accrued interest payable	2,514	(753)
(Decrease) increase in accrued expenses and taxes payable	(17,841)	2,145
Other, net	24,112	12,596
Net cash provided by operating activities	202,988	258,805
Cash Flows from Investing Activities:
Net increase in restricted short-term investments	(4,686)	(31,473)
Activity in available-for-sale securities:
Sales	161,668	182,749
Maturities, repayments, and calls	501,105	420,951
Purchases	(991,689)	(644,969)
Net increase in restricted investment in bank stock	(4,277)	(1,941)
Net increase in loans and leases	(317,127)	(288,580)
Purchase of bank-owned life insurance	(4,087)	(3,287)
Proceeds from bank-owned life insurance	6,366	5,214
Proceeds from sale of foreclosed assets	29,147	22,973
Acquisitions	(2,487)	0
Additions to premises and equipment, net	(6,619)	(8,193)
Net cash used in investing activities	(632,686)	(346,556)
Cash Flows from Financing Activities:
Net increase in deposits	360,535	367,424
Net increase (decrease) in other short-term borrowings	138,723	(219,378)
Net increase in short-term FHLB borrowings	100,000	100,000
Repayment of long-term FHLB borrowings	(13,028)	(85,271)
Proceeds from issuance of long-term debt	150,000	0
Repayment of long-term debt	(214,006)	(34,133)
Proceeds from issuance of common stock	5,644	3,134
Purchase of treasury stock	(105)	(39)
Redemption of warrant	0	(5,269)
Cash dividends paid	(25,284)	(6,501)
Net cash provided by financing activities	502,479	119,967
Net change in cash and cash equivalents	72,781	32,216
Cash and cash equivalents at January 1	332,145	252,898
Cash and cash equivalents at September 30	404,926	285,114
Supplemental Disclosure of Cash Flow Information
Cash paid for interest on deposits and borrowings	92,416	124,771
Income tax payments	18,607	2,936
Supplemental Schedule of Noncash Activities
Real estate acquired in settlement of loans	27,490	30,849
Securities purchased not settled	$ 0	$ 185,018