Loans (Details 7) (USD $) In Thousands, unless otherwise specified	Jun. 04, 2011	Dec. 31, 2011 Commercial Loans [Member]	Dec. 31, 2010 Commercial Loans [Member]	Dec. 31, 2011 Commercial Loans [Member] Pass [Member]	Dec. 31, 2010 Commercial Loans [Member] Pass [Member]	Dec. 31, 2011 Commercial Loans [Member] Pass-Watch [Member]	Dec. 31, 2010 Commercial Loans [Member] Pass-Watch [Member]	Dec. 31, 2011 Commercial Loans [Member] Special Mention [Member]	Dec. 31, 2010 Commercial Loans [Member] Special Mention [Member]	Dec. 31, 2011 Commercial Loans [Member] Substandard [Member]	Dec. 31, 2010 Commercial Loans [Member] Substandard [Member]	Dec. 31, 2011 Commercial Loans [Member] Doubtful [Member]	Dec. 31, 2010 Commercial Loans [Member] Doubtful [Member]	Dec. 31, 2011 Commercial Loans [Member] Loss [Member]	Dec. 31, 2010 Commercial Loans [Member] Loss [Member]	Dec. 31, 2011 Originated loans [Member] Commercial Loans [Member]	Dec. 31, 2010 Originated loans [Member] Commercial Loans [Member]	Dec. 31, 2011 Originated loans [Member] Commercial Loans [Member] Pass [Member]	Dec. 31, 2010 Originated loans [Member] Commercial Loans [Member] Pass [Member]	Dec. 31, 2011 Originated loans [Member] Commercial Loans [Member] Pass-Watch [Member]	Dec. 31, 2010 Originated loans [Member] Commercial Loans [Member] Pass-Watch [Member]	Dec. 31, 2011 Originated loans [Member] Commercial Loans [Member] Special Mention [Member]	Dec. 31, 2010 Originated loans [Member] Commercial Loans [Member] Special Mention [Member]	Dec. 31, 2011 Originated loans [Member] Commercial Loans [Member] Substandard [Member]	Dec. 31, 2010 Originated loans [Member] Commercial Loans [Member] Substandard [Member]	Dec. 31, 2011 Originated loans [Member] Commercial Loans [Member] Doubtful [Member]	Dec. 31, 2010 Originated loans [Member] Commercial Loans [Member] Doubtful [Member]	Dec. 31, 2011 Originated loans [Member] Commercial Loans [Member] Loss [Member]	Dec. 31, 2010 Originated loans [Member] Commercial Loans [Member] Loss [Member]	Dec. 31, 2011 Acquired loans [Member] Commercial Loans [Member]	Dec. 31, 2011 Acquired loans [Member] Commercial Loans [Member] Pass [Member]	Dec. 31, 2011 Acquired loans [Member] Commercial Loans [Member] Pass-Watch [Member]	Dec. 31, 2011 Acquired loans [Member] Commercial Loans [Member] Special Mention [Member]	Dec. 31, 2011 Acquired loans [Member] Commercial Loans [Member] Substandard [Member]	Dec. 31, 2011 Acquired loans [Member] Commercial Loans [Member] Doubtful [Member]	Dec. 31, 2011 Acquired loans [Member] Commercial Loans [Member] Loss [Member]	Dec. 31, 2011 Covered loans [Member] Commercial Loans [Member]	Dec. 31, 2010 Covered loans [Member] Commercial Loans [Member]	Dec. 31, 2011 Covered loans [Member] Commercial Loans [Member] Pass [Member]	Dec. 31, 2010 Covered loans [Member] Commercial Loans [Member] Pass [Member]	Dec. 31, 2011 Covered loans [Member] Commercial Loans [Member] Pass-Watch [Member]	Dec. 31, 2010 Covered loans [Member] Commercial Loans [Member] Pass-Watch [Member]	Dec. 31, 2011 Covered loans [Member] Commercial Loans [Member] Special Mention [Member]	Dec. 31, 2010 Covered loans [Member] Commercial Loans [Member] Special Mention [Member]	Dec. 31, 2011 Covered loans [Member] Commercial Loans [Member] Substandard [Member]	Dec. 31, 2010 Covered loans [Member] Commercial Loans [Member] Substandard [Member]	Dec. 31, 2011 Covered loans [Member] Commercial Loans [Member] Doubtful [Member]	Dec. 31, 2010 Covered loans [Member] Commercial Loans [Member] Doubtful [Member]	Dec. 31, 2011 Covered loans [Member] Commercial Loans [Member] Loss [Member]	Dec. 31, 2010 Covered loans [Member] Commercial Loans [Member] Loss [Member]
Commercial Credit Exposure
Total	$ 535,489	$ 8,062,158	$ 3,147,765	$ 7,010,406	$ 2,378,561	$ 150,041	$ 174,128	$ 170,375	$ 47,247	$ 653,628	$ 519,213	$ 77,596	$ 28,616	$ 112	$ 0	$ 3,325,972	$ 2,773,434	$ 3,110,746	$ 2,332,952	$ 76,393	$ 138,839	$ 35,155	$ 26,216	$ 103,254	$ 265,180	$ 424	$ 10,247	$ 0	$ 0	$ 4,496,644	$ 3,882,817	$ 60,042	$ 125,852	$ 426,003	$ 1,930	$ 0	$ 239,542	$ 374,331	$ 16,843	$ 45,609	$ 13,606	$ 35,289	$ 9,368	$ 21,031	$ 124,371	$ 254,033	$ 75,242	$ 18,369	$ 112	$ 0