Loans - Changes in Status of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	$ 35,521	$ 11,180
Specific reserve associated with restructured loans that subsequently defaulted	0
Interest rate reduction
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	896
Interest rate reduction | Consumer loans | Consumer Owner-Occupied Loans
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	896
Term extension
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	34,359	10,921
Term extension | Other income producing property
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost		342
Term extension | Commercial loans | Construction and land development
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost		254
Term extension | Commercial loans | Commercial non-owner occupied
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost		1,250
Term extension | Commercial loans | Commercial owner-occupied real estate loan
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	13,461	7,591
Term extension | Commercial loans | Commercial and industrial
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	19,553	1,207
Term extension | Consumer loans | Consumer Owner-Occupied Loans
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	1,345	277
Term Extension and Interest Rate Reduction
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost		259
Term Extension and Interest Rate Reduction | Consumer loans | Consumer Owner-Occupied Loans
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost		$ 259
Term Extension and Payment Delay
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	266
Term Extension and Payment Delay | Commercial loans | Commercial and industrial
Allowance for Credit Losses
Paying Under Restructured Terms - Amortized Cost	$ 266