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Fair Value Measurements: Fair Value, Option, Quantitative Disclosures (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Fair Value, Inputs, Level 1 | Cash
Value of Assets	$ 93,007	$ 55,400
Fair Value, Inputs, Level 1 | Demand and savings deposits
Value of Liabilities	724,041	660,421
Fair Value, Inputs, Level 2 | Certificates of Deposit
Value of Assets	15,414	16,959
Fair Value, Inputs, Level 2 | Available-for-sale Securities
Value of Assets	150,465	148,882
Fair Value, Inputs, Level 2 | Held-to-maturity Securities
Investment securities held to maturity	71	76
Fair Value, Inputs, Level 2 | Investment in Federal Home Loan Bank Stock
Value of Assets	1,060	1,060
Fair Value, Inputs, Level 2 | Loans held for sale
Value of Assets	991	503
Fair Value, Inputs, Level 2 | Time Deposits
Value of Liabilities	114,668	119,143
Fair Value, Inputs, Level 2 | Capital lease obligation
Value of Liabilities	2,464	2,475
Fair Value, Inputs, Level 3 | Available-for-sale Securities
Value of Assets	1,786	1,808
Fair Value, Inputs, Level 3 | Loans Receivable
Value of Assets	606,184	571,068
Fair Value, Inputs, Level 3 | Subordinated Debt Obligations
Value of Liabilities	7,969	7,705
Estimate of Fair Value, Fair Value Disclosure | Cash
Value of Assets	93,007	55,400
Estimate of Fair Value, Fair Value Disclosure | Certificates of Deposit
Value of Assets	15,414	16,959
Estimate of Fair Value, Fair Value Disclosure | Available-for-sale Securities
Value of Assets	152,251	150,690
Estimate of Fair Value, Fair Value Disclosure | Held-to-maturity Securities
Investment securities held to maturity	71	76
Estimate of Fair Value, Fair Value Disclosure | Loans Receivable
Value of Assets	606,184	571,068
Estimate of Fair Value, Fair Value Disclosure | Investment in Federal Home Loan Bank Stock
Value of Assets	1,060	1,060
Estimate of Fair Value, Fair Value Disclosure | Demand and savings deposits
Value of Liabilities	724,041	660,421
Estimate of Fair Value, Fair Value Disclosure | Subordinated Debt Obligations
Value of Liabilities	7,969	7,705
Estimate of Fair Value, Fair Value Disclosure | Loans held for sale
Value of Assets	991	503
Estimate of Fair Value, Fair Value Disclosure | Time Deposits
Value of Liabilities	114,668	119,143
Estimate of Fair Value, Fair Value Disclosure | Capital lease obligation
Value of Liabilities	2,464	2,475
Carry Value | Cash
Value of Assets	93,007	55,400
Carry Value | Certificates of Deposit
Value of Assets	15,275	16,769
Carry Value | Available-for-sale Securities
Value of Assets	152,251	150,690
Carry Value | Held-to-maturity Securities
Investment securities held to maturity	69	75
Carry Value | Loans Receivable
Value of Assets	640,873	614,934
Carry Value | Investment in Federal Home Loan Bank Stock
Value of Assets	1,060	1,060
Carry Value | Demand and savings deposits
Value of Liabilities	724,041	660,421
Carry Value | Subordinated Debt Obligations
Value of Liabilities	22,681	22,681
Carry Value | Loans held for sale
Value of Assets	991	503
Carry Value | Time Deposits
Value of Liabilities	114,861	119,382
Carry Value | Capital lease obligation
Value of Liabilities	$ 2,464	$ 2,475

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