Loans (Details Textual) (USD $)	3 Months Ended				3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2012 Covered Loans [Member]		Mar. 31, 2011 Covered Loans [Member]		Dec. 31, 2011 Covered Loans [Member]		Mar. 31, 2012 Acquired Loans Noncovered [Member]	Dec. 31, 2011 Acquired Loans Noncovered [Member]	Mar. 31, 2011 Acquired Loans Noncovered [Member]	Mar. 31, 2012 Legacy Loans [Member]	Dec. 31, 2011 Legacy Loans [Member]	Mar. 31, 2011 Legacy Loans [Member]	Mar. 31, 2012 Commercial Real Estate Other Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Commercial Real Estate Other Receivable [Member] Covered Loans [Member]		Mar. 31, 2011 Commercial Real Estate Other Receivable [Member] Covered Loans [Member]		Mar. 31, 2012 Commercial Real Estate Other Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Commercial Real Estate Other Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2011 Commercial Real Estate Other Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2012 Commercial Real Estate Other Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial Real Estate Other Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Commercial Real Estate Other Receivable [Member] Legacy Loans [Member]	Mar. 31, 2012 Commercial Construction Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Commercial Construction Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2011 Commercial Construction Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2012 Commercial Construction Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial Construction Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Commercial Construction Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2012 Commercial Leases Financing Receivable [Member] Covered Loans [Member]	Dec. 31, 2011 Commercial Leases Financing Receivable [Member] Covered Loans [Member]	Mar. 31, 2011 Commercial Leases Financing Receivable [Member] Covered Loans [Member]	Mar. 31, 2012 Commercial Leases Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Commercial Leases Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2011 Commercial Leases Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2012 Commercial Leases Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial Leases Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Commercial Leases Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2012 Consumer Installment Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Consumer Installment Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2011 Consumer Installment Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2012 Consumer Installment Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Consumer Installment Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2011 Consumer Installment Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2012 Consumer Installment Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Installment Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Consumer Installment Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2012 Consumer Home Equity Lines Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2012 Consumer Home Equity Lines Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2012 Consumer Home Equity Lines Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2012 Consumer Credit Card Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Credit Card Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Consumer Credit Card Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2012 Consumer Residential Mortgages Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2012 Consumer Residential Mortgages Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2012 Consumer Residential Mortgages Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2012 Commercial and Industrial Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Commercial and Industrial Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2011 Commercial and Industrial Financing Receivable [Member] Covered Loans [Member]		Mar. 31, 2012 Commercial and Industrial Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Commercial and Industrial Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2011 Commercial and Industrial Financing Receivable [Member] Acquired Loans Noncovered [Member]	Mar. 31, 2012 Commercial and Industrial Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial and Industrial Financing Receivable [Member] Legacy Loans [Member]	Mar. 31, 2011 Commercial and Industrial Financing Receivable [Member] Legacy Loans [Member]	May 14, 2010 Midwest Transaction [Member]	Feb. 19, 2010 First Bank Branches [Member]	Feb. 19, 2010 George Washington [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	$ 6,600,000	$ 4,000,000	$ 6,000,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value																																																																																																		1,800,000,000	275,600,000	177,800,000
Acquired Non Impaired Loans	162,600,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,515,024,000	1,954,383,000	1,600,000,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	11,813,000	21,246,000
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements					10,831,000		20,510,000
Benefit Attributable to FDIC Loss Share Agreements					(4,899,000)		(15,179,000)
Loans Payments Past Due	90 days
Credit Card Loans Past Due	120 days
Allowance for Loan and Lease Losses, Period Increase (Decrease)					5,900,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due					264,059,000	[1]	347,767,000	[2]	269,976,000	[3]	771,000	1,743,000	132,000	49,556,000	60,449,000	80,001,000	162,963,000	[1]	170,795,000	[3]	204,726,000	[2]	706,000	1,675,000	35,000	23,439,000	29,976,000	46,562,000	57,628,000	[1]	57,978,000	[3]	71,386,000	[2]	5,309,000	7,837,000	11,562,000							0	0	0	22,000	[1]	60,000	[3]	1,084,000	[2]	0	1,000	16,000	4,380,000	5,167,000	6,128,000	260,000	[1]	1,088,000	[3]	1,350,000	[2]	0	1,000	0	1,126,000	1,241,000	353,000	809,000	1,019,000	1,224,000	14,532,000	[1]	14,254,000	[3]	12,161,000	[2]	0	0	0	10,029,000	9,719,000	8,472,000	28,654,000	[1]	25,801,000	[3]	57,060,000	[2]	65,000	66,000	81,000	4,464,000	5,490,000	5,700,000
Financing Receivable, Recorded Investment, Past Due					330,467,000	[1]	447,012,000	[2]	336,787,000	[3]	1,848,000	2,262,000	5,939,000	95,232,000	107,913,000	159,945,000	195,698,000	[1]	204,069,000	[3]	257,911,000	[2]	1,524,000	2,127,000	5,474,000	32,775,000	40,982,000	66,042,000	71,011,000	[1]	63,858,000	[3]	79,997,000	[2]	5,588,000	7,876,000	22,343,000							775,000	0	0	45,000	[1]	109,000	[3]	1,298,000	[2]	14,000	1,000	31,000	14,585,000	20,086,000	19,121,000	2,494,000	[1]	4,838,000	[3]	3,878,000	[2]	245,000	68,000	73,000	3,824,000	4,646,000	4,854,000	2,198,000	2,816,000	3,140,000	28,724,000	[1]	28,524,000	[3]	31,206,000	[2]	0	0	65,000	20,742,000	23,556,000	19,970,000	32,495,000	[1]	35,389,000	[3]	72,722,000	[2]	65,000	66,000	296,000	14,745,000	7,951,000	24,475,000
Financing Receivable, Recorded Investment, Current					876,547,000	[1]	1,157,262,000	[2]	954,689,000	[3]	97,302,000	110,906,000	190,312,000	7,668,827,000	7,527,863,000	6,830,028,000	530,405,000	[1]	573,779,000	[3]	718,706,000	[2]	57,514,000	60,616,000	108,719,000	1,951,798,000	1,951,211,000	1,935,381,000	12,208,000	[1]	26,051,000	[3]	30,050,000	[2]	280,127,000	269,459,000	236,675,000							73,337,000	73,530,000	60,487,000	9,163,000	[1]	10,013,000	[3]	11,149,000	[2]	2,166,000	2,519,000	2,972,000	1,243,165,000	1,241,059,000	1,260,046,000	134,003,000	[1]	136,710,000	[3]	151,674,000	[2]	18,466,000	19,223,000	21,975,000	717,013,000	720,045,000	710,045,000	138,420,000	143,540,000	138,724,000	41,297,000	[1]	45,986,000	[3]	60,278,000	[2]	1,668,000	1,840,000	1,483,000	406,540,000	388,268,000	377,862,000	149,471,000	[1]	162,150,000	[3]	185,405,000	[2]	17,488,000	26,708,000	55,163,000	2,858,427,000	2,740,751,000	2,110,808,000
Financing Receivable					1,207,014,000	[1]	1,604,274,000	[2]	1,291,476,000	[3]	99,150,000	113,168,000	196,251,000	7,764,059,000	7,635,776,000	6,989,973,000	726,103,000	[1]	777,848,000	[3]	976,617,000	[2]	59,038,000	62,743,000	114,193,000	1,984,573,000	1,992,193,000	2,001,423,000	83,219,000	[1]	89,909,000	[3]	110,047,000	[2]	285,715,000	277,335,000	259,018,000	0	0	0	0	0	0	74,112,000	73,530,000	60,487,000	9,208,000	[1]	10,122,000	[3]	12,447,000	[2]	2,180,000	2,520,000	3,003,000	1,257,750,000	1,261,145,000	1,279,167,000	136,497,000	[1]	141,548,000	[3]	155,552,000	[2]	18,711,000	19,291,000	22,048,000	720,837,000	724,691,000	714,899,000	140,618,000	146,356,000	141,864,000	70,021,000	[1]	74,510,000	[3]	91,484,000	[2]	1,668,000	1,840,000	1,548,000	427,282,000	411,824,000	397,832,000	181,966,000	[1]	197,539,000	[3]	258,127,000	[2]	17,553,000	26,774,000	55,459,000	2,873,172,000	2,748,702,000	2,135,283,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing											0	3,000	26,000	9,261,000	11,373,000	7,993,000							0	0	0	614,000	984,000	963,000							0	609,000	0							0	0	0							0	1,000	16,000	4,141,000	4,864,000	3,523,000							0	2,000	0	556,000	796,000	353,000	309,000	403,000	461,000							0	0	0	3,381,000	3,252,000	2,693,000							0	0	10,000	260,000	465,000	0
Financing Receivable, Recorded Investment, Nonaccrual Status											1,500,000	2,949,000	107,000	51,763,000	61,682,000	82,599,000							1,430,000	2,880,000	35,000	32,145,000	36,025,000	52,657,000							5,451,000	7,575,000	12,392,000							0	0	0							0	0	0	434,000	624,000	1,149,000							0	0	0	1,113,000	1,102,000	1,438,000	522,000	622,000	1,089,000							0	0	0	6,648,000	6,468,000	7,784,000							70,000	69,000	72,000	5,450,000	9,266,000	6,090,000
Covered Loans Loss Share Receivable			$ 205,700,000	$ 288,600,000

[1] Excludes loss share receivable of $171.1 million as of March 31, 2012.

[2] Excludes loss share receivable of $266.0 million as of March 31, 2011

[3] Excludes loss share receivable of $205.7 million as of December 31, 2011.