Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities:
Net income	$ 94,115	$ 84,295	$ 37,569
Adjustment to reconcile net income to net cash provided by operating activities:
Provision for credit losses	7,500	28,000	130,081
Depreciation and amortization	26,544	27,720	28,890
Deferred taxes	3,358	(3,749)	(4,251)
Amortization of intangibles	2,979	3,222	3,324
Amortization of debt securities premium and discount, net	15,062	13,422	19,176
Share-based compensation expense	1,644	1,886	2,683
Security gains, net	(46)	(442)	(12,127)
Net deferred loan origination expense	(7,639)	(7,944)	(8,357)
Excess tax benefit from exercise of stock options	(139)	32	50
Decrease in interest receivable	2,206	6,910	9,759
Decrease in interest payable	(1,304)	(2,504)	(5,692)
Realized gain on mortgages sold	(49,304)	(68,114)	(36,968)
Proceeds from mortgages sold	1,530,589	2,019,225	1,262,709
Origination of mortgages held for sale	(1,424,983)	(1,996,479)	(1,212,548)
Loss on other real estate owned, net	7,385	30,172	21,432
Increase in bank-owned life insurance	(8,314)	(8,074)	(7,663)
(Increase) decrease in prepaid pension asset	(3,705)	16,795	25,056
Decrease in prepaid deposit insurance assessments		11,086	20,088
Other, net	7,784	5,198	2,905
Net cash provided by operating activities	203,732	160,657	276,116
Investing Activities:
Proceeds from calls and maturities of held-to-maturity securities			135,781
Proceeds from calls and maturities of available-for-sale securities	584,926	520,952	387,105
Proceeds from sales of available-for-sale securities		3,628	274,807
Purchases of held-to-maturity securities			(151,105)
Purchases of available-for-sale securities	(718,432)	(430,819)	(414,269)
Net decrease in short-term investments			150,000
Net (increase) decrease in loans and leases	(361,383)	150,225	214,043
Purchases of premises and equipment	(25,459)	(24,680)	(20,475)
Proceeds from sale of premises and equipment	3,084	1,136	2,363
Acquisition of businesses, net of cash acquired	(17,360)	(5,971)
Proceeds from sale of other real estate owned	54,475	73,660	63,509
Proceeds of bank-owned life insurance, net of proceeds from death benefits		(22,961)	1,641
Contingency earn-out payment			(1,200)
Other, net	117	(23)	(51)
Net cash (used in) provided by investing activities	(480,032)	265,147	642,149
Financing Activities:
Net (decrease) increase in deposits	(314,310)	132,957	(534,832)
Net increase (decrease) in short-term debt and other liabilities	6,403	39,165	(69,399)
Redemption of junior subordinated debt securities	(128,866)
Advances of long-term debt	50,000
Repayment of long-term debt	(1,786)		(75,000)
Issuance of common stock	912	110,229	20
Repurchase of common stock		(75)	(57)
Excess tax (benefit) expense from exercise of stock options	139	(32)	(50)
Payment of cash dividends	(11,383)	(3,778)	(11,689)
Net cash (used in) provided by financing activities	(398,891)	278,466	(691,007)
(Decrease) increase in Cash and Cash Equivalents	(675,191)	704,270	227,258
Cash and Cash Equivalents at Beginning of Year	1,203,614	499,344	272,086
Cash and Cash Equivalents at End of Year	$ 528,423	$ 1,203,614	$ 499,344