Mortgage Servicing (Additional Information) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Servicing Assets at Fair Value [Line Items]
Servicing Asset At Amortized Value Net Of Valuation Allowance	$ 493,000		$ 726,000
Servicing Asset at Fair Value, Amount	1,447,000	[1]	1,494,000	[1],[2]	879,000	[1]	1,138,000	[1]
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	4.77%
Mortgage servicing fee income	251,000		679,000		320,000
Gain (Loss) on Sale of Mortgage Loans	31,000		728,000		268,000
Freddie Mac [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage loans serviced during period, value	141,100,000		157,900,000		156,100,000
Custodial escrow balances	484,000		518,000
Maine State Housing Authority [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage servicing fee income	1,200,000		1,100,000		1,200,000
Mortgage loans serviced during period, value	585,300,000		614,400,000		650,600,000
Custodial escrow balances	5,300,000		5,300,000
Fixed Rate Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage Loans on Real Estate, Cost of Mortgages Sold	$ 799,000		$ 33,300,000		$ 16,900,000
US Treasury Notes Securities [Member]
Servicing Assets at Fair Value [Line Items]
term to maturity	10 years

[1] Reported fair value represents all MSRs currently being serviced by the Company, regardless of carrying amount.

[2] Reported fair value represents all MSRs currently being serviced by the Company at December 31, 2013, regardless of carrying amount.