Loans and Credit Quality (Impaired loans by loan class)(Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Financing Receivable, Modifications, Performing, Recorded Investment	$ 70,000,000			$ 70,000,000			$ 70,300,000
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	81,770,000	[1]		81,770,000	[1]		81,301,000	[1]
Recorded investment With related allowance recorded	39,321,000	[1]		39,321,000	[1]		38,568,000	[1]
Total Recorded investment	121,091,000	[1]		121,091,000	[1]		119,869,000	[1]
Unpaid principal balance With no related allowance recorded	97,567,000	[2]		97,567,000	[2]		112,795,000	[2]
Unpaid principal balance With related allowance recorded	39,581,000	[2]		39,581,000	[2]		38,959,000	[2]
Impaired Financing Receivable, Related Allowance	2,636,000			2,636,000			2,571,000
Total Unpaid principal balance	137,148,000	[2]		137,148,000	[2]		151,754,000	[2]
Total Average recorded investment	119,052,000		122,186,000	118,952,000		123,538,000
Residential Mortgage [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	41,422,000	[1]		41,422,000	[1]		39,341,000	[1]
Recorded investment With related allowance recorded	33,471,000	[1]		33,471,000	[1]		33,842,000	[1]
Total Recorded investment	74,893,000	[1],[3]		74,893,000	[1],[3]		73,183,000	[1],[3]
Unpaid principal balance With no related allowance recorded	43,600,000	[2]		43,600,000	[2]		41,935,000	[2]
Unpaid principal balance With related allowance recorded	33,530,000	[2]		33,530,000	[2]		33,900,000	[2]
Impaired Financing Receivable, Related Allowance	836,000	[3]		836,000	[3]		1,358,000	[3]
Total Unpaid principal balance	77,130,000	[2],[3]		77,130,000	[2],[3]		75,835,000	[2],[3]
Total Average recorded investment	72,840,000		79,527,000	72,508,000		77,841,000
Home Equity Line of Credit [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	1,949,000	[1]		1,949,000	[1]		1,895,000	[1]
Recorded investment With related allowance recorded	572,000	[1]		572,000	[1]		749,000	[1]
Total Recorded investment	2,521,000	[1]		2,521,000	[1]		2,644,000	[1]
Unpaid principal balance With no related allowance recorded	1,974,000	[2]		1,974,000	[2]		1,968,000	[2]
Unpaid principal balance With related allowance recorded	572,000	[2]		572,000	[2]		749,000	[2]
Impaired Financing Receivable, Related Allowance	115,000			115,000			84,000
Total Unpaid principal balance	2,546,000	[2]		2,546,000	[2]		2,717,000	[2]
Total Average recorded investment	2,457,000		3,095,000	2,524,000		3,345,000
Consumer Portfolio Segment [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	43,371,000	[1]		43,371,000	[1]		41,236,000	[1]
Recorded investment With related allowance recorded	34,043,000	[1]		34,043,000	[1]		34,591,000	[1]
Total Recorded investment	77,414,000	[1]		77,414,000	[1]		75,827,000	[1]
Unpaid principal balance With no related allowance recorded	45,574,000	[2]		45,574,000	[2]		43,903,000	[2]
Unpaid principal balance With related allowance recorded	34,102,000	[2]		34,102,000	[2]		34,649,000	[2]
Impaired Financing Receivable, Related Allowance	951,000			951,000			1,442,000
Total Unpaid principal balance	79,676,000	[2]		79,676,000	[2]		78,552,000	[2]
Total Average recorded investment	75,297,000		82,622,000	75,032,000		81,186,000
Commercial Real Estate [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	30,344,000	[1]		30,344,000	[1]		31,876,000	[1]
Recorded investment With related allowance recorded	793,000	[1]		793,000	[1]
Total Recorded investment	31,137,000	[1]		31,137,000	[1]		31,876,000	[1]
Unpaid principal balance With no related allowance recorded	33,367,000	[2]		33,367,000	[2]		45,921,000	[2]
Unpaid principal balance With related allowance recorded	797,000	[2]		797,000	[2]
Impaired Financing Receivable, Related Allowance	122,000			122,000			0
Total Unpaid principal balance	34,164,000	[2]		34,164,000	[2]		45,921,000	[2]
Total Average recorded investment	31,209,000		27,456,000	31,638,000		27,775,000
Multifamily Residential [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	508,000	[1]		508,000	[1]		508,000	[1]
Recorded investment With related allowance recorded	2,594,000	[1]		2,594,000	[1]		2,655,000	[1]
Total Recorded investment	3,102,000	[1]		3,102,000	[1]		3,163,000	[1]
Unpaid principal balance With no related allowance recorded	508,000	[2]		508,000	[2]		508,000	[2]
Unpaid principal balance With related allowance recorded	2,771,000	[2]		2,771,000	[2]		2,832,000	[2]
Impaired Financing Receivable, Related Allowance	366,000			366,000			427,000
Total Unpaid principal balance	3,279,000	[2]		3,279,000	[2]		3,340,000	[2]
Total Average recorded investment	3,114,000		3,194,000	3,134,000		3,205,000
Commercial Real Estate Construction Financing Receivable [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	5,693,000	[1]		5,693,000	[1]		6,148,000	[1]
Recorded investment With related allowance recorded	0	[1]		0	[1]
Total Recorded investment	5,693,000	[1]		5,693,000	[1]		6,148,000	[1]
Unpaid principal balance With no related allowance recorded	14,824,000	[2]		14,824,000	[2]		15,299,000	[2]
Unpaid principal balance With related allowance recorded	0	[2]		0	[2]
Impaired Financing Receivable, Related Allowance	0			0			0
Total Unpaid principal balance	14,824,000	[2]		14,824,000	[2]		15,299,000	[2]
Total Average recorded investment	5,768,000		7,218,000	5,898,000		9,450,000
Commercial Business [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	1,854,000	[1]		1,854,000	[1]		1,533,000	[1]
Recorded investment With related allowance recorded	1,891,000	[1]		1,891,000	[1]		1,322,000	[1]
Total Recorded investment	3,745,000	[1]		3,745,000	[1]		2,855,000	[1]
Unpaid principal balance With no related allowance recorded	3,294,000	[2]		3,294,000	[2]		7,164,000	[2]
Unpaid principal balance With related allowance recorded	1,911,000	[2]		1,911,000	[2]		1,478,000	[2]
Impaired Financing Receivable, Related Allowance	1,197,000			1,197,000			702,000
Total Unpaid principal balance	5,205,000	[2]		5,205,000	[2]		8,642,000	[2]
Total Average recorded investment	3,664,000		1,696,000	3,250,000		1,922,000
Commercial Portfolio Segment [Member]
Impaired loans by loan portfolio segment and loan class [Abstract]
Recorded investment With no related allowance recorded	38,399,000	[1]		38,399,000	[1]		40,065,000	[1]
Recorded investment With related allowance recorded	5,278,000	[1]		5,278,000	[1]		3,977,000	[1]
Total Recorded investment	43,677,000	[1]		43,677,000	[1]		44,042,000	[1]
Unpaid principal balance With no related allowance recorded	51,993,000	[2]		51,993,000	[2]		68,892,000	[2]
Unpaid principal balance With related allowance recorded	5,479,000	[2]		5,479,000	[2]		4,310,000	[2]
Impaired Financing Receivable, Related Allowance	1,685,000			1,685,000			1,129,000
Total Unpaid principal balance	57,472,000	[2]		57,472,000	[2]		73,202,000	[2]
Total Average recorded investment	$ 43,755,000		$ 39,564,000	$ 43,920,000		$ 42,352,000

[1] Includes partial charge-offs and nonaccrual interest paid.

[2] Unpaid principal balance does not include partial charge-offs or nonaccrual interest paid. Related allowance is calculated on net book balances not unpaid principal balances.

[3] Includes $70.0 million in performing troubled debt restructurings ("TDRs").