Mortgage-backed Securities: Schedule of available-for-sale mortgage-backed securities, Contractual Maturities (Details) (Collateralized Mortgage Backed Securities, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Collateralized Mortgage Backed Securities
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	$ 2,478
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	2,493
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	5,585
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	5,616
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	92,550
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	93,107
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	100,613
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 101,216

Mortgage-backed Securities: Schedule of available-for-sale mortgage-backed securities, Contractual Maturities (Details) (Collateralized Mortgage Backed Securities, USD $)
In Thousands, unless otherwise specified

Dec. 31, 2014

Collateralized Mortgage Backed Securities

Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis

$ 2,478us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
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= us-gaap_MortgageBackedSecuritiesMember

Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value

2,493us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember

Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis

5,585us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember

Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value

5,616us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember

Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis

92,550us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember

Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value

93,107us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember

Available-for-sale Securities, Debt Maturities, Amortized Cost Basis

100,613us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember

Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value

$ 101,216us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember

- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

+ References

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- Definition

Amount of available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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