Fair Value Measurements (Details) (USD $)																																												12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Significant Unobservable Inputs Level 3 Maximum	Dec. 31, 2012 Measured on a Recurring Basis Fair Value	Dec. 31, 2011 Measured on a Recurring Basis Fair Value	Dec. 31, 2012 Measured on a Recurring Basis Fair Value U.S. Treasury	Dec. 31, 2011 Measured on a Recurring Basis Fair Value U.S. Treasury	Dec. 31, 2012 Measured on a Recurring Basis Fair Value Federal agency - Debt	Dec. 31, 2011 Measured on a Recurring Basis Fair Value Federal agency - Debt	Dec. 31, 2012 Measured on a Recurring Basis Fair Value Federal agency - MBS	Dec. 31, 2011 Measured on a Recurring Basis Fair Value Federal agency - MBS	Dec. 31, 2012 Measured on a Recurring Basis Fair Value CMOs - Federal agency	Dec. 31, 2011 Measured on a Recurring Basis Fair Value CMOs - Federal agency	Dec. 31, 2012 Measured on a Recurring Basis Fair Value CMOs - Non-agency	Dec. 31, 2011 Measured on a Recurring Basis Fair Value CMOs - Non-agency	Dec. 31, 2012 Measured on a Recurring Basis Fair Value State and municipal	Dec. 31, 2011 Measured on a Recurring Basis Fair Value State and municipal	Dec. 31, 2012 Measured on a Recurring Basis Fair Value Other debt securities	Dec. 31, 2011 Measured on a Recurring Basis Fair Value Other debt securities	Dec. 31, 2012 Measured on a Recurring Basis Fair Value Equity securities and mutual funds	Dec. 31, 2011 Measured on a Recurring Basis Fair Value Equity securities and mutual funds	Dec. 31, 2012 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1	Dec. 31, 2011 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1	Dec. 31, 2012 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 U.S. Treasury	Dec. 31, 2011 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 U.S. Treasury	Dec. 31, 2012 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 Equity securities and mutual funds	Dec. 31, 2011 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 Equity securities and mutual funds	Dec. 31, 2012 Measured on a Recurring Basis Significant Other Observable Inputs Level 2	Dec. 31, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2	Dec. 31, 2012 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - Debt	Dec. 31, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - Debt	Dec. 31, 2012 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - MBS	Dec. 31, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - MBS	Dec. 31, 2012 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Federal agency	Dec. 31, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Federal agency	Dec. 31, 2012 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Non-agency	Dec. 31, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Non-agency	Dec. 31, 2012 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 State and municipal	Dec. 31, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 State and municipal	Dec. 31, 2012 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Other debt securities	Dec. 31, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Other debt securities	Dec. 31, 2012 Measured on a Recurring Basis Significant Unobservable Inputs Level 3	Dec. 31, 2011 Measured on a Recurring Basis Significant Unobservable Inputs Level 3	Dec. 31, 2012 Measured on a Recurring Basis Significant Unobservable Inputs Level 3 State and municipal	Dec. 31, 2012 Measured on a Recurring Basis Significant Unobservable Inputs Level 3 Other debt securities	Dec. 31, 2011 Measured on a Recurring Basis Significant Unobservable Inputs Level 3 Other debt securities	Dec. 31, 2012 Measured on a Nonrecurring Basis	Dec. 31, 2011 Measured on a Nonrecurring Basis	Dec. 31, 2012 Measured on a Nonrecurring Basis Commercial	Dec. 31, 2011 Measured on a Nonrecurring Basis Commercial	Dec. 31, 2012 Measured on a Nonrecurring Basis Commercial real estate mortgages	Dec. 31, 2011 Measured on a Nonrecurring Basis Commercial real estate mortgages	Dec. 31, 2012 Measured on a Nonrecurring Basis Residential mortgage	Dec. 31, 2011 Measured on a Nonrecurring Basis Residential mortgage	Dec. 31, 2012 Measured on a Nonrecurring Basis Real estate construction	Dec. 31, 2011 Measured on a Nonrecurring Basis Real estate construction	Dec. 31, 2012 Measured on a Nonrecurring Basis Equity lines of credit	Dec. 31, 2011 Measured on a Nonrecurring Basis Equity lines of credit	Dec. 31, 2012 Measured on a Nonrecurring Basis Installment loan	Dec. 31, 2011 Measured on a Nonrecurring Basis Installment loan	Dec. 31, 2012 Measured on a Nonrecurring Basis Other real estate owned	Dec. 31, 2011 Measured on a Nonrecurring Basis Other real estate owned	Dec. 31, 2012 Measured on a Nonrecurring Basis Private equity and alternative investments	Dec. 31, 2011 Measured on a Nonrecurring Basis Private equity and alternative investments	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Commercial	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Commercial	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Commercial real estate mortgages	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Commercial real estate mortgages	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Residential mortgage	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Residential mortgage	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Real estate construction	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Real estate construction	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Equity lines of credit	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Equity lines of credit	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Installment loan	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Installment loan	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Other real estate owned	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Other real estate owned	Dec. 31, 2012 Measured on a Nonrecurring Basis Fair Value Private equity and alternative investments	Dec. 31, 2011 Measured on a Nonrecurring Basis Fair Value Private equity and alternative investments	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial real estate mortgages	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial real estate mortgages	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Residential mortgage	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Real estate construction	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Equity lines of credit	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Installment loan	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Installment loan	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Other real estate owned	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Other real estate owned	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Commercial	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Commercial	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Commercial real estate mortgages	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Residential mortgage	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Residential mortgage	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Real estate construction	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Real estate construction	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Equity lines of credit	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Equity lines of credit	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Other real estate owned	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Other real estate owned	Dec. 31, 2012 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Private equity and alternative investments	Dec. 31, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Private equity and alternative investments
Assets
Securities available-for-sale								$ 20,397,000	$ 19,182,000	$ 2,349,202,000	$ 1,973,862,000	$ 693,032,000	$ 681,044,000	$ 5,318,253,000	$ 4,326,907,000	$ 61,513,000	$ 69,001,000	$ 454,474,000	$ 401,604,000	$ 307,417,000	$ 99,074,000	$ 1,701,000	$ 1,227,000			$ 20,397,000	$ 19,182,000	$ 1,701,000	$ 1,227,000			$ 2,349,202,000	$ 1,973,862,000	$ 693,032,000	$ 681,044,000	$ 5,318,253,000	$ 4,326,907,000	$ 61,513,000	$ 69,001,000	$ 407,429,000	$ 401,604,000	$ 289,275,000	$ 79,491,000			$ 47,045,000	$ 18,142,000	$ 19,583,000
Trading securities						115,059,000	61,975,000																	113,010,000	61,922,000					2,049,000	53,000
Mark-to-market derivatives asset						67,496,000	62,230,000																	218,000						67,278,000	62,230,000
Collateral dependent impaired loans																																																																					2,655,000	2,484,000	10,963,000	6,830,000	1,811,000	5,555,000	7,918,000	18,528,000	780,000	3,471,000	550,000	675,000							3,950,000	6,830,000	5,084,000	9,680,000	2,588,000	550,000	675,000					2,655,000	2,484,000	7,013,000	1,811,000	471,000	7,918,000	8,848,000	780,000	883,000
Collateral dependent impaired covered loans																																																																						422,000																													422,000
Total assets at fair value						9,388,544,000	7,696,106,000																	135,326,000	82,331,000					9,188,031,000	7,594,192,000													65,187,000	19,583,000																						75,251,000	111,360,000													44,396,000	66,837,000	6,178,000	6,558,000	39,124,000	81,755,000								34,624,000	56,898,000	36,127,000	29,605,000										9,772,000	9,939,000	6,178,000	6,558,000
Percent of total assets					1.00%	33.00%	33.00%																																																												0.30%	0.50%
Prepayment rate (as a percent)																																												2.00%
Default rate of performing collateral (as a percent)																																												0.75%
Recovery Rate (as a percent)																																												15.00%
Recovery Rate lag time (in years)																																												2 years
Liabilities
Mark-to-market derivatives liabilities						64,432,000	52,881,000																							64,432,000	52,881,000
Contingent consideration liability						47,724,000																																						47,724,000
FDIC clawback liability						9,970,000	8,103,000																																					9,970,000	8,103,000
Other liabilities						368,000	263,000																							368,000	263,000
Total liabilities at fair value						122,494,000	61,247,000																		1,542,000					64,800,000	53,144,000													57,694,000	8,103,000
Redeemable noncontrolling interest	41,112,000	44,643,000	45,676,000	51,381,000		41,112,000	44,643,000																																					41,112,000	44,643,000
Net (losses) gains recognized for assets measured at fair value on nonrecurring basis
Collateral dependent impaired loans:																																																			(368,000)	(394,000)	(1,143,000)	5,673,000	(975,000)	(484,000)	(5,137,000)	(13,001,000)	(25,000)	(705,000)	(208,000)	(4,596,000)
Collateral dependent impaired covered loans:																																																				(325,000)
Total net losses recognized																																																	(31,847,000)	(56,546,000)													(20,695,000)	(41,531,000)	(3,296,000)	(1,183,000)
Total net losses recognized on covered assets																																																															$ 17,700,000	$ 38,500,000