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Investment Securities: Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Total Investment Securities, Amortized Cost Basis |  | $ 95,694 |  |  | $ 95,694 |  |  | $ 69,395 |  | $ 69,395
Proceeds from Maturities, Prepayments and Calls of Mortgage Backed Securities (MBS) |  | 5,800 |  | $ 3,200 | 11,722 |  | $ 7,296 |  |  |
Amortized Cost |  | 8,068 |  |  | 8,068 |  |  | 8,954 |  |
Held-to-maturity Securities, Gross Gains, Derivatives |  |  |  |  | 147 |  |  | 265 |  |
Held-to-maturity Securities, Gross Losses, Derivatives |  |  |  |  | 437 |  |  | 77 |  |
Held-to-maturity Securities |  | 87,626 |  |  | 87,626 |  |  | 60,441 |  |
Held-to-maturity Securities, Fair Value |  | 87,336 |  |  | 87,336 |  |  | 60,629 |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment |  | 87,626 |  |  | 87,626 |  |  | 60,441 |  |
Gross Unrealized Gains |  |  |  |  | 337 |  |  | 364 |  |
Gross Unrealized Losses |  |  |  |  | 0 |  |  | 0 |  |
Investment securities – available for sale, at fair value |  | 8,405 |  |  | 8,405 |  |  | 9,318 |  |
Carrying Value |  | 8,405 |  |  | 8,405 |  |  | 9,318 |  |
Total Investment Securities, Gross Unrealized Gains |  |  |  |  | 484 |  |  | 629 |  |
Total Investment Securities, Gross Unrealized Losses |  |  |  |  | 437 |  |  | 77 |  |
Total Investment Securites |  | 95,741 |  |  | 95,741 |  |  | 69,947 |  | 69,947
Total Investment Securities, Carrying Value |  | 96,031 |  |  | 96,031 |  |  | 69,759 |  |
Certificates of Deposit [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Held-to-maturity Securities, Gross Gains, Derivatives |  |  |  |  | 0 |  |  | 0 |  |
Held-to-maturity Securities, Gross Losses, Derivatives |  |  |  |  | 0 |  |  | 0 |  |
Held-to-maturity Securities |  | 600 |  |  | 600 |  |  | 600 |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment |  | 600 |  |  | 600 |  |  | 600 |  |
Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Investment securities – available for sale, at fair value |  | 8,405 |  |  | 8,405 |  |  |  |  | 9,318
Carrying Value |  | 8,405 |  |  | 8,405 |  |  |  |  | $ 9,318
U.S. government agency MBS |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Amortized Cost |  | 4,678 |  |  | 4,678 |  |  | 5,197 | [1] |
Gross Unrealized Gains |  |  |  |  | 181 |  |  | 186 | [1] |
Gross Unrealized Losses |  |  |  |  | 0 |  |  | 0 | [1] |
Investment securities – available for sale, at fair value |  | 4,859 |  |  | 4,859 |  |  | 5,383 |  |
Carrying Value |  | 4,859 |  |  | 4,859 |  |  | 5,383 |  |
U.S. government sponsored enterprise MBS |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Amortized Cost |  | 2,977 |  |  | 2,977 |  |  | 3,301 |  |
Held-to-maturity Securities, Gross Gains, Derivatives |  |  |  |  | 147 | [1] |  | 265 |  |
Held-to-maturity Securities, Gross Losses, Derivatives |  |  |  |  | 437 | [1] |  | 77 |  |
Held-to-maturity Securities |  | 87,026 |  |  | 87,026 |  |  | 59,841 |  |
Held-to-maturity Securities, Fair Value |  | 86,736 |  |  | 86,736 |  |  | 60,029 |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment |  | 87,026 | [1] |  | 87,026 | [1] |  | 59,841 |  |
Gross Unrealized Gains |  |  |  |  | 150 |  |  | 173 |  |
Gross Unrealized Losses |  |  |  |  | 0 |  |  | 0 |  |
Investment securities – available for sale, at fair value |  | 3,127 |  |  | 3,127 |  |  | 3,474 |  |
Carrying Value |  | 3,127 |  |  | 3,127 |  |  | 3,474 |  |
Collateralized Mortgage Obligations [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Amortized Cost | [2] | 413 |  |  | 413 |  |  | 456 |  |
Gross Unrealized Gains | [2] |  |  |  | 6 |  |  | 5 |  |
Gross Unrealized Losses | [2] |  |  |  | 0 |  |  | 0 |  |
Investment securities – available for sale, at fair value |  | 419 |  |  | 419 |  |  | 461 |  |
Carrying Value |  | $ 419 |  |  | $ 419 |  |  | $ 461 |  |
[1] | Mortgage-Backed Securities (“MBS”).
[2] | Collateralized Mortgage Obligations (“CMO”).

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