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