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Loans - Performance of Loans Modified (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	$ 158,571	$ 35,521
Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	158,203	35,521
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	1,854
90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	353
Commercial loans | Construction and land development | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	26,528
Commercial loans | Construction and land development | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	282
Commercial loans | Commercial non-owner-occupied | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	98,313
Commercial loans | Commercial owner-occupied real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	13,593	13,461
Commercial loans | Commercial owner-occupied real estate | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	368
Commercial loans | Commercial and industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	11,949	19,819
Commercial loans | Commercial and industrial | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	285
Consumer loans | Consumer owner-occupied | Total Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	7,820	$ 2,241
Consumer loans | Consumer owner-occupied | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	919
Consumer loans | Consumer owner-occupied | 90 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Payment Status (Amortized Cost Basis)	$ 353

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