Mortgage Servicing (Additional Information) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013	Oct. 16, 2015	Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost		$ 2,161,000	$ 493,000		$ 726,000		$ 542,000
Servicing Asset at Fair Value, Amount	[1]	$ 2,947,000	$ 1,447,000	[2]	1,494,000		$ 879,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed		11.00%	11.70%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate		7.50%	7.00%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed		$ 79,000
Fees and Commissions, Mortgage Banking and Servicing		624,000	$ 251,000		679,000
Gain (Loss) on Sale of Mortgage Loans		1,278,000	31,000		728,000
Mortgage loans serviced during period, value		963,000,000	733,000,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed		238,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate		129,000
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Discount Rate		246,000
Capitalized upon sale		294,000	15,000		466,000
Maine State Housing Authority [Member]
Servicing Assets at Fair Value [Line Items]
Fees and Commissions, Mortgage Banking and Servicing		1,200,000	1,200,000		1,100,000
Mortgage loans serviced during period, value		612,100,000	585,300,000
Custodial escrow balances		4,300,000	5,300,000
Fixed Rate Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage Loans on Real Estate, Cost of Mortgages Sold		61,200,000	799,000		$ 33,300,000
Custodial escrow balances		$ 7,100,000	$ 8,200,000
Residential Mortgage [Member]
Servicing Assets at Fair Value [Line Items]
Term to maturity (years)		30 years
US Treasury Notes Securities [Member]
Servicing Assets at Fair Value [Line Items]
Term to maturity (years)		10 years
SBM Financial, Inc. [Member]
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Amount						$ 1,600,000
Capitalized upon sale		$ 1,608,000

[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, 2014, regardless of carrying amount.