Investment Securities (Pooled Trust Preferred Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Investment [Line Items]
Amortized Cost	$ 2,030,801		$ 1,953,842
Available-for-Sale, Fair Value	2,071,276		1,960,222
Pooled Trust Preferred Securities [Member]
Investment [Line Items]
Amortized Cost	25,461		27,368
Available-for-Sale, Fair Value	7,327		8,400
Unrealized Gain/(Loss)	(18,134)
Realized Losses	888
Pooled Trust Preferred Securities [Member] | TROPC 2003-1A [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	A4L
Lowest Credit Rating	C	[1]
Amortized Cost	86
Available-for-Sale, Fair Value	9
Unrealized Gain/(Loss)	(77)
Realized Losses	888
Number of Issuers Currently Performing/ Remaining	17/38
Actual Deferrals and Defaults as a Percent of Original Collateral	41.70%
Expected Defaults as a Percentage of Remaining Performing Collateral	22.60%
Excess Subordination as a Percentage of Current Performing Collateral	0.00%
Pooled Trust Preferred Securities [Member] | MM Community Funding IX [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	B-2
Lowest Credit Rating	D	[1]
Amortized Cost	2,067
Available-for-Sale, Fair Value	841
Unrealized Gain/(Loss)	(1,226)
Realized Losses	0
Number of Issuers Currently Performing/ Remaining	16/31
Actual Deferrals and Defaults as a Percent of Original Collateral	41.10%
Expected Defaults as a Percentage of Remaining Performing Collateral	8.80%
Excess Subordination as a Percentage of Current Performing Collateral	0.00%
Pooled Trust Preferred Securities [Member] | Reg Div Funding 2004 [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	B-2
Lowest Credit Rating	D	[1]
Amortized Cost	4,177
Available-for-Sale, Fair Value	695
Unrealized Gain/(Loss)	(3,482)
Realized Losses	0
Number of Issuers Currently Performing/ Remaining	24/45
Actual Deferrals and Defaults as a Percent of Original Collateral	46.00%
Expected Defaults as a Percentage of Remaining Performing Collateral	7.20%
Excess Subordination as a Percentage of Current Performing Collateral	0.00%
Pooled Trust Preferred Securities [Member] | Pretsl XII [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	B-1
Lowest Credit Rating	C	[1]
Amortized Cost	2,886
Available-for-Sale, Fair Value	1,571
Unrealized Gain/(Loss)	(1,315)
Realized Losses	0
Number of Issuers Currently Performing/ Remaining	49/76
Actual Deferrals and Defaults as a Percent of Original Collateral	30.10%
Expected Defaults as a Percentage of Remaining Performing Collateral	7.90%
Excess Subordination as a Percentage of Current Performing Collateral	0.00%
Pooled Trust Preferred Securities [Member] | Pretsl XV [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	B-1
Lowest Credit Rating	C	[1]
Amortized Cost	1,695
Available-for-Sale, Fair Value	1,049
Unrealized Gain/(Loss)	(646)
Realized Losses	0
Number of Issuers Currently Performing/ Remaining	50/72
Actual Deferrals and Defaults as a Percent of Original Collateral	31.30%
Expected Defaults as a Percentage of Remaining Performing Collateral	9.00%
Excess Subordination as a Percentage of Current Performing Collateral	0.00%
Pooled Trust Preferred Securities [Member] | Reg Div Funding 2005 [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	B-1
Lowest Credit Rating	C	[1]
Amortized Cost	311
Available-for-Sale, Fair Value	69
Unrealized Gain/(Loss)	(242)
Realized Losses	0
Number of Issuers Currently Performing/ Remaining	23/49
Actual Deferrals and Defaults as a Percent of Original Collateral	49.30%
Expected Defaults as a Percentage of Remaining Performing Collateral	18.40%
Excess Subordination as a Percentage of Current Performing Collateral	0.00%
Pooled Trust Preferred Securities [Member] | MM Community Funding II [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	B
Pooled Trust Preferred Securities [Member] | Pretsl XXVII LTD [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	B
Lowest Credit Rating	C	[1]
Amortized Cost	4,849
Available-for-Sale, Fair Value	1,130
Unrealized Gain/(Loss)	(3,719)
Realized Losses	0
Number of Issuers Currently Performing/ Remaining	33/49
Actual Deferrals and Defaults as a Percent of Original Collateral	28.10%
Expected Defaults as a Percentage of Remaining Performing Collateral	24.40%
Excess Subordination as a Percentage of Current Performing Collateral	28.60%
Pooled Trust Preferred Securities [Member] | Trapeza Ser 13A [Member]
Investment [Line Items]
Pooled trust preferred securities, Class	A2A
Lowest Credit Rating	CCC-	[1]
Amortized Cost	9,390
Available-for-Sale, Fair Value	1,963
Unrealized Gain/(Loss)	(7,427)
Realized Losses	0
Number of Issuers Currently Performing/ Remaining	35/55
Actual Deferrals and Defaults as a Percent of Original Collateral	29.20%
Expected Defaults as a Percentage of Remaining Performing Collateral	21.30%
Excess Subordination as a Percentage of Current Performing Collateral	40.90%
Single Issuer Trust Preferred Securities [Member]
Investment [Line Items]
Amortized Cost	11,933
Available-for-Sale, Fair Value	9,941
Unrealized Gain/(Loss)	(1,992)
Realized Losses	0
Single Issuer Trust Preferred Securities [Member] | First Empire Cap (M&T) 1 [Member]
Investment [Line Items]
Lowest Credit Rating	BBB	[1]
Amortized Cost	956
Available-for-Sale, Fair Value	994
Unrealized Gain/(Loss)	38
Realized Losses	0
Single Issuer Trust Preferred Securities [Member] | First Empire Cap (M&T) 2 [Member]
Investment [Line Items]
Lowest Credit Rating	BBB	[1]
Amortized Cost	2,905
Available-for-Sale, Fair Value	2,982
Unrealized Gain/(Loss)	77
Realized Losses	0
Single Issuer Trust Preferred Securities [Member] | Fleet Cap Tr V (BOA) [Member]
Investment [Line Items]
Lowest Credit Rating	BB+	[1]
Amortized Cost	3,359
Available-for-Sale, Fair Value	2,539
Unrealized Gain/(Loss)	(820)
Realized Losses	0
Single Issuer Trust Preferred Securities [Member] | JP Morgan Chase Cap XIII [Member]
Investment [Line Items]
Lowest Credit Rating	BBB	[1]
Amortized Cost	4,713
Available-for-Sale, Fair Value	3,426
Unrealized Gain/(Loss)	(1,287)
Realized Losses	0
Trust Preferred Securities [Member]
Investment [Line Items]
Amortized Cost	37,394
Available-for-Sale, Fair Value	17,268
Unrealized Gain/(Loss)	(20,126)
Realized Losses	$ 888

[1] Lowest rating for the security provided by any nationally recognized credit rating agency.