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Investment Securities: Held-to-Maturity Investment Securities by Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity $ 156,105 $ 172,097
U.S. Treasury and U.S. government agency securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 79,391 92,312
U.S. government agencies    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 48,161 49,481
Private label residential    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 26,833 28,479
Municipal securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 1,223 1,330
Bank issued trust preferred securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 497 495
AAA/AA/A    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 144,101 159,300
AAA/AA/A | U.S. Treasury and U.S. government agency securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 79,391 92,312
AAA/AA/A | U.S. government agencies    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 48,161 49,481
AAA/AA/A | Private label residential    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 15,326 16,277
AAA/AA/A | Municipal securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 1,223 1,230
AAA/AA/A | Bank issued trust preferred securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
BBB/BB/B    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
BBB/BB/B | U.S. Treasury and U.S. government agency securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
BBB/BB/B | U.S. government agencies    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
BBB/BB/B | Private label residential    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
BBB/BB/B | Municipal securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
BBB/BB/B | Bank issued trust preferred securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
Unrated    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 12,004 12,797
Unrated | U.S. Treasury and U.S. government agency securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
Unrated | U.S. government agencies    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 0
Unrated | Private label residential    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 11,507 12,202
Unrated | Municipal securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity 0 100
Unrated | Bank issued trust preferred securities    
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]    
Total held to maturity $ 497 $ 495