Investment Securities: Held-to-Maturity Investment Securities by Risk (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	$ 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	92,312
U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	49,481
Private label securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	28,479
Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	1,330
Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	495
AAA/AA/A
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	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	92,312
AAA/AA/A | U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	49,481
AAA/AA/A | Private label securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	16,277
AAA/AA/A | Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	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
BBB/BB/B
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	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
BBB/BB/B | U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0
BBB/BB/B | Private label securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0
BBB/BB/B | Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0
BBB/BB/B | Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0
Unrated
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	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
Unrated | U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0
Unrated | Private label securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	12,202
Unrated | Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	100
Unrated | Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	$ 495