Allowance for Credit Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Impaired loans and leases
Recorded Investment	$ 1,123,315	$ 1,175,670
Unpaid Principal Balance	1,440,333	1,370,544
Related Allowance	168,001	213,933
Impaired Financing Receivable with No Related Allowance [Member]
Impaired loans and leases
Recorded Investment	398,590	271,166
Unpaid Principal Balance	505,602	327,240
Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	724,725	904,504
Unpaid Principal Balance	934,731	1,043,304
Related Allowance	168,001	213,933
Commercial, financial, leasing, etc. [Member]
Impaired loans and leases
Recorded Investment	171,642	174,197
Unpaid Principal Balance	206,288	237,580
Related Allowance	48,674	40,909
Commercial, financial, leasing, etc. [Member] | Impaired Financing Receivable with No Related Allowance [Member]
Impaired loans and leases
Recorded Investment	53,104	52,453
Unpaid Principal Balance	60,778	66,692
Commercial, financial, leasing, etc. [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	118,538	121,744
Unpaid Principal Balance	145,510	170,888
Related Allowance	48,674	40,909
Commercial real estate loans [Member]
Impaired loans and leases
Recorded Investment	174,522	188,244
Unpaid Principal Balance	219,574	221,815
Related Allowance	17,651	17,393
Commercial real estate loans [Member] | Impaired Financing Receivable with No Related Allowance [Member]
Impaired loans and leases
Recorded Investment	71,636	77,269
Unpaid Principal Balance	91,118	81,800
Commercial real estate loans [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	102,886	110,975
Unpaid Principal Balance	128,456	140,015
Related Allowance	17,651	17,393
Residential builder and developer [Member]
Impaired loans and leases
Recorded Investment	292,449	334,707
Unpaid Principal Balance	458,146	381,070
Related Allowance	52,562	78,597
Residential builder and developer [Member] | Impaired Financing Receivable with No Related Allowance [Member]
Impaired loans and leases
Recorded Investment	133,156	71,162
Unpaid Principal Balance	177,277	86,039
Residential builder and developer [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	159,293	263,545
Unpaid Principal Balance	280,869	295,031
Related Allowance	52,562	78,597
Other commercial construction [Member]
Impaired loans and leases
Recorded Investment	106,886	117,214
Unpaid Principal Balance	114,501	122,539
Related Allowance	3,836	22,067
Other commercial construction [Member] | Impaired Financing Receivable with No Related Allowance [Member]
Impaired loans and leases
Recorded Investment	86,652	36,280
Unpaid Principal Balance	89,862	37,107
Other commercial construction [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	20,234	80,934
Unpaid Principal Balance	24,639	85,432
Related Allowance	3,836	22,067
Residential real estate excluding Alt-A [Member]
Impaired loans and leases
Recorded Investment	121,568	78,041
Unpaid Principal Balance	145,123	93,002
Related Allowance	4,420	3,375
Residential real estate excluding Alt-A [Member] | Impaired Financing Receivable with No Related Allowance [Member]
Impaired loans and leases
Recorded Investment	19,686	5,035
Unpaid Principal Balance	25,625	7,723
Residential real estate excluding Alt-A [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	101,882	73,006
Unpaid Principal Balance	119,498	85,279
Related Allowance	4,420	3,375
Residential Alt-A [Member]
Impaired loans and leases
Recorded Investment	184,752	209,632
Unpaid Principal Balance	223,920	239,324
Related Allowance	25,000	36,000
Residential Alt-A [Member] | Impaired Financing Receivable with No Related Allowance [Member]
Impaired loans and leases
Recorded Investment	34,356	28,967
Unpaid Principal Balance	60,942	47,879
Residential Alt-A [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	150,396	180,665
Unpaid Principal Balance	162,978	191,445
Related Allowance	25,000	36,000
Home equity lines and loans [Member]
Impaired loans and leases
Recorded Investment	9,385	11,799
Unpaid Principal Balance	10,670	13,378
Related Allowance	2,306	2,227
Home equity lines and loans [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	9,385	11,799
Unpaid Principal Balance	10,670	13,378
Related Allowance	2,306	2,227
Automobile [Member]
Impaired loans and leases
Recorded Investment	53,710	58,858
Unpaid Principal Balance	53,710	58,858
Related Allowance	11,468	12,597
Automobile [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	53,710	58,858
Unpaid Principal Balance	53,710	58,858
Related Allowance	11,468	12,597
Other [Member]
Impaired loans and leases
Recorded Investment	8,401	2,978
Unpaid Principal Balance	8,401	2,978
Related Allowance	2,084	768
Other [Member] | Impaired Financing Receivable with Related Allowance [Member]
Impaired loans and leases
Recorded Investment	8,401	2,978
Unpaid Principal Balance	8,401	2,978
Related Allowance	$ 2,084	$ 768