Commitments and Contingent Liabilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Outstanding letter of credit, maturity [Abstract]
Average balance maintained at the FRBNY	$ 244,000,000	$ 98,000,000
Total rental expense	1,300,000	1,600,000	1,600,000
Capital Leases [Abstract]
2013	302,000
2014	311,000
2015	317,000
2016	329,000
2017	341,000
Thereafter	5,408,000
Total minimum lease payments	7,008,000
Less: amounts representing interest	2,320,000
Present value of minimum lease payments	4,688,000
Operating Leases [Abstract]
2013	1,674,000
2014	1,681,000
2015	1,630,000
2016	1,282,000
2017	1,061,000
Thereafter	1,285,000
Total minimum lease payments	8,613,000
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Letters of credit	19,000,000	20,000,000
Outstanding letter of credit, maturity [Abstract]
2013	18,652,000
2014	0
2015	87,000
2016 and thereafter	342,000
Outstanding letter of credit	19,081,000
Commitments to Extend Credit [Member]
Outstanding letter of credit, maturity [Abstract]
Commitment to originate loans and commitments under unused lines of credit	$ 140,000,000	$ 129,000,000