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Securities - Schedule of Amortized Cost of Debt Securities Held-to-Maturity, Aggregated by Credit Quality Indicator (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity $ 231,160
Investment Grade  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 217,533
Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 13,627
State and municipal debt obligations  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 168,446
State and municipal debt obligations | Investment Grade  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 168,446
State and municipal debt obligations | Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 0
Corporate debt securities  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 53,699
Corporate debt securities | Investment Grade  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 40,072
Corporate debt securities | Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 13,627
Non-agency commercial MBS  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 9,015
Non-agency commercial MBS | Investment Grade  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity 9,015
Non-agency commercial MBS | Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Total debt securities held-to-maturity $ 0