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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Held to Maturity |  |  |  |
Amortized Cost | $ 211,818 |  | $ 270,218 | [1]
Gross Unrealized Gains | 331 |  | 295 |
Gross Unrealized Losses | (11,342) |  | (16,747) |
Estimated Fair Value | 200,807 |  | 253,766 |
Allowance for Credit Losses ("ACL") | 85 | $ 82 | 0 |
Available for Sale |  |  |  |
Amortized Cost | 62,689 |  | 43,132 |
Gross Unrealized Gains | 34 |  | 0 |
Gross Unrealized Losses | (977) |  | (1,361) |
Estimated Fair Value | 61,746 |  | 41,771 |
U.S. Treasury and U.S. government agency securities |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 122,087 |  | 171,626 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | (6,952) |  | (10,088) |
Estimated Fair Value | 115,135 |  | 161,538 |
Allowance for Credit Losses ("ACL") | 0 |  |  |
U.S. government agencies |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 52,218 |  | 52,294 |
Gross Unrealized Gains | 3 |  | 0 |
Gross Unrealized Losses | (2,676) |  | (3,950) |
Estimated Fair Value | 49,545 |  | 48,344 |
Allowance for Credit Losses ("ACL") | 0 |  |  |
Available for Sale |  |  |  |
Amortized Cost | 62,689 |  | 43,132 |
Gross Unrealized Gains | 34 |  | 0 |
Gross Unrealized Losses | (977) |  | (1,361) |
Estimated Fair Value | 61,746 |  | 41,771 |
Private label residential |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 35,153 |  | 44,011 |
Gross Unrealized Gains | 328 |  | 295 |
Gross Unrealized Losses | (1,658) |  | (2,611) |
Estimated Fair Value | 33,823 |  | 41,695 |
Allowance for Credit Losses ("ACL") | 77 | 73 | 0 |
Municipal securities |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 1,868 |  | 1,787 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | (24) |  | (47) |
Estimated Fair Value | 1,844 |  | 1,740 |
Allowance for Credit Losses ("ACL") | 0 |  |  |
Bank issued trust preferred securities |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 492 |  | 500 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | (32) |  | (51) |
Estimated Fair Value | 460 |  | 449 |
Allowance for Credit Losses ("ACL") | $ 8 | $ 9 | $ 0 |
[1] | Derived from audited consolidated financial statements.

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