Allowance For Loan Losses And Credit Quality (Investment In Covered Loans And Non-Covered Loan By Credit Quality Indicator) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Credit risk by payment status, Current	$ 5,642,858,000	$ 4,388,324,000
Credit risk by payment status, Past due greater than 30 days	125,017,000	64,261,000
Credit risk by payment status, Total	7,200,646,000	6,035,332,000
Total loans receivable	7,200,646,000	6,035,332,000
Covered Loan [Member] | Commercial Loans [Member]
Credit quality indicator by asset risk classification		1,508,312,000
Credit risk by payment status, Total		1,039,867,000
Discount		(468,445,000)
Total loans receivable		1,039,867,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member]
Credit quality indicator by asset risk classification		423,323,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Pass [Member]
Credit quality indicator by asset risk classification	88,595,000	144,423,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Special Mention [Member]
Credit quality indicator by asset risk classification	18,953,000	27,783,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Substandard [Member]
Credit quality indicator by asset risk classification	222,772,000	245,872,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Doubtful [Member]
Credit quality indicator by asset risk classification	727,000	5,245,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Internally Assigned Grade [Member]
Credit quality indicator by asset risk classification	331,047,000
Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member]
Credit quality indicator by asset risk classification		910,486,000
Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Pass [Member]
Credit quality indicator by asset risk classification	349,457,000	385,910,000
Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Special Mention [Member]
Credit quality indicator by asset risk classification	66,289,000	104,228,000
Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Substandard [Member]
Credit quality indicator by asset risk classification	373,129,000	402,397,000
Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Doubtful [Member]
Credit quality indicator by asset risk classification	23,079,000	17,951,000
Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Internally Assigned Grade [Member]
Credit quality indicator by asset risk classification	811,954,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member]
Credit quality indicator by asset risk classification		174,503,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Pass [Member]
Credit quality indicator by asset risk classification	104,394,000	126,176,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Special Mention [Member]
Credit quality indicator by asset risk classification	5,968,000	7,475,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Substandard [Member]
Credit quality indicator by asset risk classification	37,369,000	39,462,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Doubtful [Member]
Credit quality indicator by asset risk classification	3,631,000	1,390,000
Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Internally Assigned Grade [Member]
Credit quality indicator by asset risk classification	151,362,000
Covered Loan [Member] | Commercial Loans [Member] | Pass [Member]
Credit quality indicator by asset risk classification	542,446,000	656,509,000
Covered Loan [Member] | Commercial Loans [Member] | Special Mention [Member]
Credit quality indicator by asset risk classification	91,210,000	139,486,000
Covered Loan [Member] | Commercial Loans [Member] | Substandard [Member]
Credit quality indicator by asset risk classification	633,270,000	687,731,000
Covered Loan [Member] | Commercial Loans [Member] | Doubtful [Member]
Credit quality indicator by asset risk classification	27,437,000	24,586,000
Covered Loan [Member] | Commercial Loans [Member] | Internally Assigned Grade [Member]
Credit quality indicator by asset risk classification	1,294,363,000
Credit risk by payment status, Total	964,224,000
Discount	(330,139,000)
Total loans receivable	964,224,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Pass [Member]
Credit quality indicator by asset risk classification	295,838,000	236,830,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Special Mention [Member]
Credit quality indicator by asset risk classification	36,762,000	17,918,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Substandard [Member]
Credit quality indicator by asset risk classification	8,280,000	10,204,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Doubtful [Member]
Credit quality indicator by asset risk classification	170,000	296,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Real Estate - Construction [Member] | Internally Assigned Grade [Member]
Credit quality indicator by asset risk classification	341,050,000	265,248,000
Credit risk by payment status, Total	341,050,000	265,248,000
Total loans receivable	341,050,000	265,248,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Pass [Member]
Credit quality indicator by asset risk classification	2,076,248,000	1,422,506,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Special Mention [Member]
Credit quality indicator by asset risk classification	77,182,000	25,524,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Substandard [Member]
Credit quality indicator by asset risk classification	124,583,000	68,005,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Doubtful [Member]
Credit quality indicator by asset risk classification	3,909,000	461,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Real Estate- Other [Member] | Internally Assigned Grade [Member]
Credit quality indicator by asset risk classification	2,281,922,000	1,516,496,000
Credit risk by payment status, Total	2,252,016,000	1,516,496,000
Discount	(29,906,000)
Total loans receivable	2,252,016,000	1,516,496,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Pass [Member]
Credit quality indicator by asset risk classification	1,547,578,000	1,322,977,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Special Mention [Member]
Credit quality indicator by asset risk classification	41,831,000	7,455,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Substandard [Member]
Credit quality indicator by asset risk classification	14,602,000	8,105,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Doubtful [Member]
Credit quality indicator by asset risk classification	248,000	2,815,000
Non-Covered Loan [Member] | Commercial Loans [Member] | Commercial Business [member] | Internally Assigned Grade [Member]
Credit quality indicator by asset risk classification	1,604,259,000	1,341,352,000
Credit risk by payment status, Total	1,604,259,000	1,341,352,000
Total loans receivable	1,604,259,000	1,341,352,000
Covered Loan [Member] | Other Consumer [Member] | Consumer Loans [Member]
Credit risk by payment status, Current	2,473,000	67,099,000
Credit risk by payment status, Past due greater than 30 days	76,629,000	79,950,000
Credit risk by payment status, Total	79,102,000	147,049,000
Total loans receivable	79,102,000	147,049,000
Covered Loan [Member] | Home equity [Member] | Consumer Loans [Member]
Credit risk by payment status, Current	213,419,000	169,264,000
Credit risk by payment status, Past due greater than 30 days	51,496,000	63,635,000
Credit risk by payment status, Total	264,915,000	232,899,000
Total loans receivable	264,915,000	232,899,000
Covered Loan [Member] | Consumer Loans [Member]
Credit risk by payment status, Current	216,825,000	237,442,000
Credit risk by payment status, Past due greater than 30 days	128,216,000	143,661,000
Credit risk by payment status, Total	345,041,000	381,103,000
Discount	(80,905,000)	(99,609,000)
Total loans receivable	345,041,000	381,103,000
Covered Loan [Member] | Consumer Loans [Member] | Credit card [Member]
Credit risk by payment status, Current	933,000	1,079,000
Credit risk by payment status, Past due greater than 30 days	91,000	76,000
Credit risk by payment status, Total	1,024,000	1,155,000
Total loans receivable	1,024,000	1,155,000
Covered Loan [Member] | Consumer Loans [Member] | Internally Assigned Grade [Member]
Credit risk by payment status, Total	264,136,000	281,494,000
Total loans receivable	264,136,000	281,494,000
Covered Loan [Member] | Mortgage [Member]
Credit risk by payment status, Current	268,461,000	294,399,000
Credit risk by payment status, Past due greater than 30 days	95,955,000	107,744,000
Credit risk by payment status, Total	364,416,000	402,143,000
Discount	(130,099,000)	(140,757,000)
Total loans receivable	364,416,000	402,143,000
Covered Loan [Member] | Mortgage [Member] | Residential - Prime [Member]
Credit risk by payment status, Current	268,461,000	294,399,000
Credit risk by payment status, Past due greater than 30 days	95,955,000	107,744,000
Credit risk by payment status, Total	364,416,000	402,143,000
Total loans receivable	364,416,000	402,143,000
Covered Loan [Member] | Mortgage [Member] | Internally Assigned Grade [Member]
Credit risk by payment status, Total	234,317,000	261,386,000
Total loans receivable	234,317,000	261,386,000
Non-Covered Loan [Member] | Other Consumer [Member]
Credit risk by payment status, Current	166,468,000	99,420,000
Credit risk by payment status, Past due greater than 30 days	10,359,000	6,096,000
Credit risk by payment status, Total	176,827,000	105,516,000
Total loans receivable	176,827,000	105,516,000
Non-Covered Loan [Member] | Home equity [Member]
Credit risk by payment status, Current	737,851,000	551,101,000
Credit risk by payment status, Past due greater than 30 days	4,709,000	4,648,000
Credit risk by payment status, Total	742,560,000	555,749,000
Total loans receivable	742,560,000	555,749,000
Non-Covered Loan [Member] | Residential - Prime [Member]
Credit risk by payment status, Current	322,338,000	362,366,000
Credit risk by payment status, Past due greater than 30 days	7,378,000	7,620,000
Credit risk by payment status, Total	329,716,000	369,986,000
Total loans receivable	329,716,000	369,986,000
Non-Covered Loan [Member] | Indirect automobile [Member]
Credit risk by payment status, Current	245,171,000	253,109,000
Credit risk by payment status, Past due greater than 30 days	1,932,000	2,213,000
Credit risk by payment status, Total	247,103,000	255,322,000
Total loans receivable	247,103,000	255,322,000
Non-Covered Loan [Member] | Credit card [Member]
Credit risk by payment status, Current	43,821,000	42,298,000
Credit risk by payment status, Past due greater than 30 days	617,000	618,000
Credit risk by payment status, Total	44,438,000	42,916,000
Total loans receivable	$ 44,438,000	$ 42,916,000