Fair Value Measurements (Details) (USD $)																																																																												3 Months Ended		6 Months Ended																																																																				3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Jun. 30, 2011 Measured on a Recurring Basis	Dec. 31, 2010 Measured on a Recurring Basis	Jun. 30, 2010 Measured on a Recurring Basis	Jun. 30, 2011 Measured on a Recurring Basis Fair Value	Dec. 31, 2010 Measured on a Recurring Basis Fair Value	Jun. 30, 2010 Measured on a Recurring Basis Fair Value	Jun. 30, 2011 Measured on a Recurring Basis Fair Value U.S. Treasury	Dec. 31, 2010 Measured on a Recurring Basis Fair Value U.S. Treasury	Jun. 30, 2010 Measured on a Recurring Basis Fair Value U.S. Treasury	Jun. 30, 2011 Measured on a Recurring Basis Fair Value Federal agency - Debt	Dec. 31, 2010 Measured on a Recurring Basis Fair Value Federal agency - Debt	Jun. 30, 2010 Measured on a Recurring Basis Fair Value Federal agency - Debt	Jun. 30, 2011 Measured on a Recurring Basis Fair Value Federal agency - MBS	Dec. 31, 2010 Measured on a Recurring Basis Fair Value Federal agency - MBS	Jun. 30, 2010 Measured on a Recurring Basis Fair Value Federal agency - MBS	Jun. 30, 2011 Measured on a Recurring Basis Fair Value CMOs - Federal agency	Dec. 31, 2010 Measured on a Recurring Basis Fair Value CMOs - Federal agency	Jun. 30, 2010 Measured on a Recurring Basis Fair Value CMOs - Federal agency	Jun. 30, 2011 Measured on a Recurring Basis Fair Value CMOs - Non-agency	Dec. 31, 2010 Measured on a Recurring Basis Fair Value CMOs - Non-agency	Jun. 30, 2010 Measured on a Recurring Basis Fair Value CMOs - Non-agency	Jun. 30, 2011 Measured on a Recurring Basis Fair Value State and municipal	Dec. 31, 2010 Measured on a Recurring Basis Fair Value State and municipal	Jun. 30, 2010 Measured on a Recurring Basis Fair Value State and municipal	Jun. 30, 2011 Measured on a Recurring Basis Fair Value Other debt securities	Dec. 31, 2010 Measured on a Recurring Basis Fair Value Other debt securities	Jun. 30, 2010 Measured on a Recurring Basis Fair Value Other debt securities	Jun. 30, 2011 Measured on a Recurring Basis Fair Value Equity securities and mutual funds	Dec. 31, 2010 Measured on a Recurring Basis Fair Value Equity securities and mutual funds	Jun. 30, 2010 Measured on a Recurring Basis Fair Value Equity securities and mutual funds	Jun. 30, 2011 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1	Dec. 31, 2010 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1	Jun. 30, 2010 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1	Jun. 30, 2011 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 U.S. Treasury	Dec. 31, 2010 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 U.S. Treasury	Jun. 30, 2010 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 U.S. Treasury	Jun. 30, 2011 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 Equity securities and mutual funds	Dec. 31, 2010 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 Equity securities and mutual funds	Jun. 30, 2010 Measured on a Recurring Basis Quoted Prices in Active Markets Level 1 Equity securities and mutual funds	Jun. 30, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2	Dec. 31, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2	Jun. 30, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2	Jun. 30, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - Debt	Dec. 31, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - Debt	Jun. 30, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - Debt	Jun. 30, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - MBS	Dec. 31, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - MBS	Jun. 30, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Federal agency - MBS	Jun. 30, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Federal agency	Dec. 31, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Federal agency	Jun. 30, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Federal agency	Jun. 30, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Non-agency	Dec. 31, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Non-agency	Jun. 30, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 CMOs - Non-agency	Jun. 30, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 State and municipal	Dec. 31, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 State and municipal	Jun. 30, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 State and municipal	Jun. 30, 2011 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Other debt securities	Dec. 31, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Other debt securities	Jun. 30, 2010 Measured on a Recurring Basis Significant Other Observable Inputs Level 2 Other debt securities	Jun. 30, 2011 Measured on a Recurring Basis Significant Unobservable Inputs Level 3	Dec. 31, 2010 Measured on a Recurring Basis Significant Unobservable Inputs Level 3	Jun. 30, 2010 Measured on a Recurring Basis Significant Unobservable Inputs Level 3	Jun. 30, 2011 Measured on a Recurring Basis Significant Unobservable Inputs Level 3 Other debt securities	Dec. 31, 2010 Measured on a Recurring Basis Significant Unobservable Inputs Level 3 Other debt securities	Jun. 30, 2010 Measured on a Recurring Basis Significant Unobservable Inputs Level 3 Other debt securities	Jun. 30, 2011 Measured on a Recurring Basis Level 1 or Level 2	Dec. 31, 2010 Measured on a Recurring Basis Level 1 or Level 2	Jun. 30, 2010 Measured on a Recurring Basis Level 1 or Level 2	Jun. 30, 2011 Measured on a Nonrecurring Basis	Jun. 30, 2010 Measured on a Nonrecurring Basis	Jun. 30, 2011 Measured on a Nonrecurring Basis	Jun. 30, 2010 Measured on a Nonrecurring Basis	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value	Jun. 30, 2010 Measured on a Nonrecurring Basis Fair Value	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value Commercial	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value Commercial	Jun. 30, 2010 Measured on a Nonrecurring Basis Fair Value Commercial	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value Commercial real estate mortgages	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value Commercial real estate mortgages	Jun. 30, 2010 Measured on a Nonrecurring Basis Fair Value Commercial real estate mortgages	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value Residential mortgage	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value Residential mortgage	Jun. 30, 2010 Measured on a Nonrecurring Basis Fair Value Residential mortgage	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value Real estate construction	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value Real estate construction	Jun. 30, 2010 Measured on a Nonrecurring Basis Fair Value Real estate construction	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value Equity lines of credit	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value Equity lines of credit	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value Other real estate owned.	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value Other real estate owned.	Jun. 30, 2010 Measured on a Nonrecurring Basis Fair Value Other real estate owned.	Jun. 30, 2011 Measured on a Nonrecurring Basis Fair Value Private equity investments	Dec. 31, 2010 Measured on a Nonrecurring Basis Fair Value Private equity investments	Jun. 30, 2010 Measured on a Nonrecurring Basis Fair Value Private equity investments	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial real estate mortgages	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial real estate mortgages	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Commercial real estate mortgages	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Residential mortgage	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Residential mortgage	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Residential mortgage	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Real estate construction	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Real estate construction	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Real estate construction	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Equity lines of credit	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Equity lines of credit	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Other real estate owned.	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Other real estate owned.	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Other Observable Inputs Level 2 Other real estate owned.	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Commercial	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Commercial	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Commercial real estate mortgages	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Commercial real estate mortgages	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Residential mortgage	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Residential mortgage	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Residential mortgage	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Real estate construction	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Real estate construction	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Equity lines of credit	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Equity lines of credit	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Other real estate owned.	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Other real estate owned.	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Other real estate owned.	Jun. 30, 2011 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Private equity investments	Dec. 31, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Private equity investments	Jun. 30, 2010 Measured on a Nonrecurring Basis Significant Unobservable Inputs Level 3 Private equity investments	Jun. 30, 2011 Measured on a Nonrecurring Basis Level 2 and Level 3	Dec. 31, 2010 Measured on a Nonrecurring Basis Level 2 and Level 3	Jun. 30, 2010 Measured on a Nonrecurring Basis Level 2 and Level 3	Jun. 30, 2010 Measured on a Nonrecurring Basis Commercial	Jun. 30, 2011 Measured on a Nonrecurring Basis Commercial	Jun. 30, 2010 Measured on a Nonrecurring Basis Commercial	Jun. 30, 2011 Measured on a Nonrecurring Basis Commercial real estate mortgages	Jun. 30, 2010 Measured on a Nonrecurring Basis Commercial real estate mortgages	Jun. 30, 2011 Measured on a Nonrecurring Basis Commercial real estate mortgages	Jun. 30, 2010 Measured on a Nonrecurring Basis Commercial real estate mortgages	Jun. 30, 2011 Measured on a Nonrecurring Basis Residential mortgage	Jun. 30, 2010 Measured on a Nonrecurring Basis Residential mortgage	Jun. 30, 2011 Measured on a Nonrecurring Basis Residential mortgage	Jun. 30, 2010 Measured on a Nonrecurring Basis Residential mortgage	Jun. 30, 2011 Measured on a Nonrecurring Basis Real estate construction	Jun. 30, 2010 Measured on a Nonrecurring Basis Real estate construction	Jun. 30, 2011 Measured on a Nonrecurring Basis Real estate construction	Jun. 30, 2010 Measured on a Nonrecurring Basis Real estate construction	Jun. 30, 2011 Measured on a Nonrecurring Basis Equity lines of credit	Jun. 30, 2010 Measured on a Nonrecurring Basis Equity lines of credit	Jun. 30, 2011 Measured on a Nonrecurring Basis Equity lines of credit	Jun. 30, 2010 Measured on a Nonrecurring Basis Equity lines of credit	Jun. 30, 2011 Measured on a Nonrecurring Basis Installment loan	Jun. 30, 2011 Measured on a Nonrecurring Basis Installment loan	Jun. 30, 2011 Measured on a Nonrecurring Basis Other real estate owned.	Jun. 30, 2010 Measured on a Nonrecurring Basis Other real estate owned.	Jun. 30, 2011 Measured on a Nonrecurring Basis Other real estate owned.	Jun. 30, 2010 Measured on a Nonrecurring Basis Other real estate owned.	Jun. 30, 2011 Measured on a Nonrecurring Basis Private equity investments	Jun. 30, 2010 Measured on a Nonrecurring Basis Private equity investments	Jun. 30, 2011 Measured on a Nonrecurring Basis Private equity investments	Jun. 30, 2010 Measured on a Nonrecurring Basis Private equity investments	Jun. 30, 2011 Significant Unobservable Inputs Level 3
Assets
Securities available-for-sale													$ 13,076,000	$ 14,113,000	$ 19,145,000	$ 1,847,232,000	$ 1,142,328,000	$ 1,090,846,000	$ 534,726,000	$ 551,346,000	$ 466,713,000	$ 3,453,901,000	$ 3,497,147,000	$ 2,528,237,000	$ 91,083,000	$ 118,295,000	$ 217,078,000	$ 357,804,000	$ 343,380,000	$ 360,422,000	$ 44,121,000	$ 43,630,000	$ 67,147,000	$ 6,112,000	$ 10,436,000	$ 11,555,000				$ 13,076,000	$ 14,113,000	$ 19,145,000	$ 6,112,000	$ 10,436,000	$ 11,555,000				$ 1,847,232,000	$ 1,142,328,000	$ 1,090,846,000	$ 534,726,000	$ 551,346,000	$ 466,713,000	$ 3,453,901,000	$ 3,497,147,000	$ 2,528,237,000	$ 91,083,000	$ 118,295,000	$ 217,078,000	$ 357,804,000	$ 343,380,000	$ 360,422,000	$ 23,315,000	$ 22,648,000	$ 42,003,000				$ 20,806,000	$ 20,982,000	$ 25,144,000
Trading securities										125,829,000	255,397,000	129,287,000																									121,141,000	249,861,000	113,483,000							4,688,000	5,536,000	15,804,000
Mark-to-market derivatives asset										44,488,000	46,712,000	60,619,000																									3,308,000	3,258,000	4,976,000							41,180,000	43,454,000	55,643,000
Collateral dependent impaired loans	120,734,000		190,755,000																																																																																										98,059,000	111,339,000
Collateral dependent impaired loans																																																																																			3,822,000	1,528,000	2,996,000	2,505,000	31,684,000	35,656,000	4,656,000	9,061,000	7,364,000	10,136,000	98,059,000	111,339,000	2,064,000	3,092,000										3,822,000	1,528,000	2,746,000	2,505,000	21,236,000	21,243,000	4,175,000	8,210,000	6,985,000	1,610,000	98,059,000	85,460,000	1,178,000	2,224,000								250,000	10,448,000	14,413,000	481,000	851,000	379,000	8,526,000	25,879,000	886,000	868,000
Collateral dependent impaired covered loans																																																																																				2,557,000																																										2,557,000
Other real estate owned	162,541,000	178,164,000	178,183,000	153,292,000	135,551,000	113,866,000
Covered other real estate owned	114,907,000		120,866,000	98,841,000
Total assets at fair value							6,520,000,000	6,022,784,000	4,951,049,000	6,518,372,000	6,022,784,000	4,951,049,000																									143,637,000	277,668,000	149,159,000							6,353,929,000	5,724,134,000	4,776,746,000																			20,806,000	20,982,000	25,144,000											91,579,000	245,778,000	212,579,000															61,103,000	88,993,000	50,797,000	7,293,000	10,804,000	4,427,000	54,554,000	196,862,000	160,026,000															41,264,000	65,605,000	43,592,000	37,025,000	48,916,000	52,553,000												19,839,000	23,388,000	7,205,000	7,293,000	10,804,000	4,427,000	91,600,000	245,778,000	212,579,000
Liabilities
Mark-to-market derivatives liabilities										29,501,000	26,437,000	31,736,000																									1,226,000	1,215,000	1,629,000							28,275,000	25,222,000	30,107,000
Other liabilities										161,000	160,000																																			161,000	160,000
Total liabilities at fair value										29,662,000	26,597,000	31,736,000																									1,226,000	1,215,000	1,629,000							28,436,000	25,382,000	30,107,000																									29,700,000	26,600,000	31,700,000
Net losses recognized for assets measured at fair value on nonrecurring basis
Collateral dependent impaired loans:																																																																																																																																																		4,279,000	606,000	6,896,000	(340,000)	141,000	(7,454,000)	17,448,000	47,000	353,000	189,000	1,206,000	3,417,000	(125,000)	1,199,000	10,120,000	546,000	51,000	510,000	51,000	(197,000)	4,317,000
Total net losses recognized																																																																												20,542,000	14,797,000	25,558,000	58,765,000																																																																																								16,869,000	10,068,000	(25,991,000)	22,616,000	200,000	30,000	200,000	428,000
Total net losses recognized for covered assets																																																																																																																																																																							$ 14,600,000		$ 22,800,000
Percent of total assets (as a percent)							29.00%	28.00%	23.00%																																																																																																																																						1.00%	1.00%	1.00%																														1.00%