Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Operating Activities:
Net income	$ 67,315	$ 24,266
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	22,000	110,831	130,081
Depreciation and amortization	20,336	21,950
Deferred taxes	0	(388)
Amortization of intangibles	2,366	2,510
Amortization of debt securities premium and discount, net	9,794	16,279
Share-based compensation expense	2,363	1,925
Security gains, net	(290)	(12,109)
Net deferred loan origination expense	(6,088)	(6,419)
Excess tax benefit from exercise of stock options	0	(12)
Decrease in interest receivable	2,952	7,687
Decrease in interest payable	(1,885)	(4,319)
Realized gain on mortgages sold	(49,030)	(24,548)
Proceeds from mortgages sold	609,052	839,577
Origination of mortgages held for sale	(607,887)	(822,905)
Increase in bank-owned life insurance	(3,713)	(3,881)
Decrease (increase) in prepaid pension asset	3,401	(373)
Decrease in prepaid deposit insurance assessments	11,086	14,613
Other, net	18,518	17,595
Net cash provided by operating activities	100,290	182,279
Investing activities:
Proceeds from calls and maturities of held-to-maturity securities	0	135,781
Proceeds from calls and maturities of available-for-sale securities	386,658	255,577
Proceeds from sales of available-for-sale securities	2,812	273,807
Purchases of held-to-maturity securities	0	(151,105)
Purchases of available-for-sale securities	(359,102)	(245,791)
Net decrease in short-term investments	0	150,000
Net decrease in loans and leases	193,925	146,289
Purchases of premises and equipment	(18,815)	(13,028)
Proceeds from sale of premises and equipment	1,063	1,820
Contingency earn-out payment	0	(1,200)
Other, net	(23)	(42)
Net cash provided by investing activities	206,518	552,108
Financing activities:
Net increase (decrease) in deposits	19,452	(426,788)
Net decrease in short-term debt and other liabilities	2,232	6,172
Repayment of long-term debt	0	(75,000)
Issuance of common stock	108,733	110
Excess tax benefit from exercise of stock options	0	12
Payment of cash dividends	(2,833)	(10,853)
Net cash provided by (used in) financing activities	127,584	(506,347)
Increase in cash and cash equivalents	434,392	228,040
Cash and cash equivalents at beginning of period	499,344	272,086	272,086
Cash and cash equivalents at end of period	$ 933,736	$ 500,126	$ 499,344