Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities:
Net income	$ 84,295	$ 37,569	$ 22,942
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	28,000	130,081	204,016
Depreciation and amortization	27,720	28,890	29,763
Deferred taxes	(3,749)	(6,568)	(16,050)
Amortization of intangibles	3,222	3,324	3,909
Amortization of debt securities premium and discount, net	13,422	19,176	5,111
Share-based compensation expense	1,886	2,683	2,043
Security gains, net	(442)	(12,127)	(2,569)
Net deferred loan origination expense	(7,944)	(8,357)	(8,948)
Excess tax expense (benefit) from exercise of stock options	32	50	(44)
Decrease in interest receivable	6,910	9,759	7,626
Decrease in interest payable	(2,504)	(5,692)	(5,252)
Realized gain on mortgages sold	(68,114)	(36,968)	(35,087)
Proceeds from mortgages sold	2,019,225	1,262,709	1,462,230
Origination of mortgages held for sale	(1,996,479)	(1,212,548)	(1,440,206)
Increase in bank-owned life insurance	(31,035)	(6,021)	(6,293)
Decrease in prepaid pension asset	16,795	25,056	1,596
Decrease in prepaid deposit insurance assessments	11,086	20,088	17,299
Other, net	31,005	5,321	(18,088)
Net cash provided by operating activities	133,331	256,425	223,998
Investing Activities:
Proceeds from calls and maturities of held-to-maturity securities	0	135,781	600,231
Proceeds from calls and maturities of available-for-sale securities	520,952	387,105	161,654
Proceeds from sales of available-for-sale securities	3,628	274,807	136,769
Purchases of held-to-maturity securities	0	(151,105)	(1,180,677)
Purchases of available-for-sale securities	(455,740)	(414,269)	(444,321)
Net decrease (increase) in short-term investments	0	150,000	(75,000)
Net decrease in loans and leases	253,171	298,884	193,684
Purchases of premises and equipment	(24,680)	(20,475)	(19,609)
Proceeds from sale of premises and equipment	1,136	2,363	486
Acquisition of businesses, net of cash acquired	(5,971)	0	0
Contingency earn-out payment	0	(1,200)	0
Other, net	(23)	(51)	(68)
Net cash provided by (used in) investing activities	292,473	661,840	(626,851)
Financing Activities:
Net increase (decrease) in deposits	132,957	(534,832)	812,319
Net increase (decrease) in short-term debt and other liabilities	39,165	(69,399)	(302,799)
Repayment of long-term debt	0	(75,000)	(33)
Issuance of common stock	110,229	20	420
Repurchase of common stock	(75)	(57)	0
Excess tax (benefit) expense from exercise of stock options	(32)	(50)	44
Payment of cash dividends	(3,778)	(11,689)	(73,457)
Net cash provided by (used in) financing activities	278,466	(691,007)	436,494
Increase in Cash and Cash Equivalents	704,270	227,258	33,641
Cash and Cash Equivalents at Beginning of Year	499,344	272,086	238,445
Cash and Cash Equivalents at End of Year	$ 1,203,614	$ 499,344	$ 272,086