Loans (Details Textual) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended				6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Covered Loans [Member]		Jun. 30, 2011 Covered Loans [Member]		Jun. 30, 2012 Covered Loans [Member]		Jun. 30, 2011 Covered Loans [Member]		Dec. 31, 2011 Covered Loans [Member]		Jun. 30, 2012 Acquired Loans Noncovered [Member]	Dec. 31, 2011 Acquired Loans Noncovered [Member]	Jun. 30, 2011 Acquired Loans Noncovered [Member]	Jun. 30, 2012 Legacy Loans [Member]	Dec. 31, 2011 Legacy Loans [Member]	Jun. 30, 2011 Legacy Loans [Member]	Jun. 30, 2012 Commercial Real Estate Other Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Commercial Real Estate Other Receivable [Member] Covered Loans [Member]		Jun. 30, 2011 Commercial Real Estate Other Receivable [Member] Covered Loans [Member]		Jun. 30, 2012 Commercial Real Estate Other Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Commercial Real Estate Other Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2011 Commercial Real Estate Other Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2012 Commercial Real Estate Other Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial Real Estate Other Receivable [Member] Legacy Loans [Member]	Jun. 30, 2011 Commercial Real Estate Other Receivable [Member] Legacy Loans [Member]	Jun. 30, 2012 Commercial Construction Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Commercial Construction Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2011 Commercial Construction Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2012 Commercial Construction Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial Construction Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2011 Commercial Construction Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2012 Commercial Leases Financing Receivable [Member] Covered Loans [Member]	Dec. 31, 2011 Commercial Leases Financing Receivable [Member] Covered Loans [Member]	Jun. 30, 2011 Commercial Leases Financing Receivable [Member] Covered Loans [Member]	Jun. 30, 2012 Commercial Leases Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Commercial Leases Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2011 Commercial Leases Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2012 Commercial Leases Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial Leases Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2011 Commercial Leases Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2012 Consumer Installment Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Consumer Installment Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2011 Consumer Installment Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2012 Consumer Installment Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Consumer Installment Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2011 Consumer Installment Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2012 Consumer Installment Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Installment Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2011 Consumer Installment Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2012 Consumer Home Equity Lines Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2011 Consumer Home Equity Lines Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 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]	Jun. 30, 2011 Consumer Home Equity Lines Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2012 Consumer Home Equity Lines Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Home Equity Lines Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2011 Consumer Home Equity Lines Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2012 Consumer Credit Card Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Credit Card Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2011 Consumer Credit Card Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2012 Consumer Residential Mortgages Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2011 Consumer Residential Mortgages Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2012 Consumer Residential Mortgages Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2011 Consumer Residential Mortgages Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2012 Consumer Residential Mortgages Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Consumer Residential Mortgages Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2011 Consumer Residential Mortgages Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 2012 Commercial and Industrial Financing Receivable [Member] Covered Loans [Member]		Dec. 31, 2011 Commercial and Industrial Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2011 Commercial and Industrial Financing Receivable [Member] Covered Loans [Member]		Jun. 30, 2012 Commercial and Industrial Financing Receivable [Member] Acquired Loans Noncovered [Member]	Dec. 31, 2011 Commercial and Industrial Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2011 Commercial and Industrial Financing Receivable [Member] Acquired Loans Noncovered [Member]	Jun. 30, 2012 Commercial and Industrial Financing Receivable [Member] Legacy Loans [Member]	Dec. 31, 2011 Commercial and Industrial Financing Receivable [Member] Legacy Loans [Member]	Jun. 30, 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	$ 5,000,000	$ 6,600,000	$ 5,000,000	$ 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		162,600,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance	1,413,526,000	1,857,424,000	1,413,526,000	1,857,424,000	1,609,852,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	12,993,000	18,712,000	24,806,000	39,958,000
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements						9,648,000		15,156,000		20,479,000		35,666,000
Benefit Attributable to FDIC Loss Share Agreements						(6,218,000)		(7,675,000)		(11,117,000)		(22,854,000)
Loans Payments Past Due	90 days
Credit Card Loans Past Due	120 days
Allowance for Loan and Lease Losses, Period Increase (Decrease)						3,400,000
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due						246,774,000	[1]	331,010,000	[2]	246,774,000	[1]	331,010,000	[2]	269,976,000	[3]	2,733,000	1,743,000	3,778,000	32,115,000	60,449,000	70,339,000	161,282,000	[1]	170,795,000	[3]	205,958,000	[2]	2,670,000	1,675,000	3,676,000	12,810,000	29,976,000	42,535,000	49,501,000	[1]	57,978,000	[3]	73,265,000	[2]	1,653,000	7,837,000	10,150,000							0	0	0	22,000	[1]	60,000	[3]	2,074,000	[2]	0	1,000	15,000	4,738,000	5,167,000	5,055,000	1,314,000	[1]	1,088,000	[3]	403,000	[2]	0	1,000	19,000	1,014,000	1,241,000	571,000	772,000	1,019,000	797,000	9,509,000	[1]	14,254,000	[3]	9,809,000	[2]	0	0	0	7,856,000	9,719,000	8,129,000	25,146,000	[1]	25,801,000	[3]	39,501,000	[2]	63,000	66,000	68,000	3,272,000	5,490,000	3,102,000
Financing Receivable, Recorded Investment, Past Due						310,054,000	[1]	428,853,000	[2]	310,054,000	[1]	428,853,000	[2]	336,787,000	[3]	3,704,000	2,262,000	8,818,000	76,180,000	107,913,000	124,184,000	202,804,000	[1]	204,069,000	[3]	269,392,000	[2]	3,034,000	2,127,000	8,095,000	23,651,000	40,982,000	55,669,000	50,535,000	[1]	63,858,000	[3]	74,077,000	[2]	2,299,000	7,876,000	12,770,000							0	0	0	637,000	[1]	109,000	[3]	2,148,000	[2]	0	1,000	88,000	15,965,000	20,086,000	17,934,000	3,647,000	[1]	4,838,000	[3]	3,005,000	[2]	607,000	68,000	159,000	2,994,000	4,646,000	3,492,000	2,072,000	2,816,000	2,208,000	22,532,000	[1]	28,524,000	[3]	28,192,000	[2]	0	0	62,000	22,948,000	23,556,000	19,248,000	29,899,000	[1]	35,389,000	[3]	52,039,000	[2]	63,000	66,000	414,000	6,251,000	7,951,000	12,863,000
Financing Receivable, Recorded Investment, Current						809,219,000	[1]	1,086,830,000	[2]	809,219,000	[1]	1,086,830,000	[2]	954,689,000	[3]	64,226,000	110,906,000	183,386,000	7,955,818,000	7,527,863,000	7,091,831,000	471,487,000	[1]	573,779,000	[3]	660,039,000	[2]	33,814,000	60,616,000	103,648,000	2,064,261,000	1,951,211,000	1,917,646,000	23,224,000	[1]	26,051,000	[3]	27,841,000	[2]	296,910,000	269,459,000	240,609,000							84,507,000	73,530,000	57,634,000	8,198,000	[1]	10,013,000	[3]	9,379,000	[2]	2,043,000	2,519,000	2,751,000	1,244,869,000	1,241,059,000	1,238,299,000	125,981,000	[1]	136,710,000	[3]	148,961,000	[2]	17,771,000	19,223,000	21,771,000	745,468,000	720,045,000	713,297,000	140,514,000	143,540,000	141,620,000	43,240,000	[1]	45,986,000	[3]	56,128,000	[2]	1,651,000	1,840,000	1,409,000	413,548,000	388,268,000	379,942,000	137,089,000	[1]	162,150,000	[3]	184,482,000	[2]	8,947,000	26,708,000	53,807,000	2,965,741,000	2,740,751,000	2,402,784,000
Financing Receivable	8,099,928,000		8,099,928,000			1,119,273,000	[1]	1,515,683,000	[2]	1,119,273,000	[1]	1,515,683,000	[2]	1,291,476,000	[3]	67,930,000	113,168,000	192,204,000	8,031,998,000	7,635,776,000	7,216,015,000	674,291,000	[1]	777,848,000	[3]	929,431,000	[2]	36,848,000	62,743,000	111,743,000	2,087,912,000	1,992,193,000	1,973,315,000	73,759,000	[1]	89,909,000	[3]	101,918,000	[2]	299,209,000	277,335,000	253,379,000	0	0	0	0	0	0	84,507,000	73,530,000	57,634,000	8,835,000	[1]	10,122,000	[3]	11,527,000	[2]	2,043,000	2,520,000	2,839,000	1,260,834,000	1,261,145,000	1,256,233,000	129,628,000	[1]	141,548,000	[3]	151,966,000	[2]	18,378,000	19,291,000	21,930,000	748,462,000	724,691,000	716,789,000	142,586,000	146,356,000	143,828,000	65,772,000	[1]	74,510,000	[3]	84,320,000	[2]	1,651,000	1,840,000	1,471,000	436,496,000	411,824,000	399,190,000	166,988,000	[1]	197,539,000	[3]	236,521,000	[2]	9,010,000	26,774,000	54,221,000	2,971,992,000	2,748,702,000	2,415,647,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing																0	3,000	2,917,000	6,545,000	11,373,000	10,084,000							0	0	2,883,000	460,000	984,000	1,900,000							0	609,000	31,000							0	0	0							0	1,000	15,000	4,384,000	4,864,000	3,316,000							0	2,000	19,000	1,000	796,000	571,000	289,000	403,000	349,000							0	0	0	1,411,000	3,252,000	3,715,000							0	0	0	0	465,000	202,000
Financing Receivable, Recorded Investment, Nonaccrual Status																2,847,000	2,949,000	861,000	43,840,000	61,682,000	71,778,000							2,778,000	2,880,000	793,000	22,621,000	36,025,000	47,164,000							1,794,000	7,575,000	10,495,000							0	0	0							0	0	0	355,000	624,000	787,000							0	0	0	1,088,000	1,102,000	938,000	502,000	622,000	563,000							0	0	0	6,361,000	6,468,000	6,663,000							69,000	69,000	68,000	11,119,000	9,266,000	5,168,000
Covered Loans Loss Share Receivable	$ 152,600,000	$ 239,400,000	$ 152,600,000	$ 239,400,000	$ 205,700,000

[1] Excludes loss share receivable of $152.6 million as of June 30, 2012.

[2] Excludes loss share receivable of $239.4 million as of June 30, 2011

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