Loans, Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	$ 779	$ 635
Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	16,746	18,022
30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	863	1,938
90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	1,056	510
Hotel/Motel [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	0	0
Hotel/Motel [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	1,954	0
Hotel/Motel [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Hotel/Motel [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Commercial Real Estate Residential [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	0	0
Commercial Real Estate Residential [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	119	2,122
Commercial Real Estate Residential [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	219	44
Commercial Real Estate Residential [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	237	0
Commercial Real Estate Nonresidential [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	0	0
Commercial Real Estate Nonresidential [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	47	9,813
Commercial Real Estate Nonresidential [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Commercial Real Estate Nonresidential [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	26
Dealer Floorplans [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	0	0
Dealer Floorplans [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Dealer Floorplans [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Dealer Floorplans [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Commercial Other [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	64	264
Commercial Other [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	5,215	1,060
Commercial Other [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	335	320
Commercial Other [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	345
Real Estate Mortgage [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	715	349
Real Estate Mortgage [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	8,865	3,935
Real Estate Mortgage [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	245	1,442
Real Estate Mortgage [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	819	139
Home Equity Lines [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	0	22
Home Equity Lines [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	162	519
Home Equity Lines [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	100
Home Equity Lines [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Consumer Direct [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	0	0
Consumer Direct [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	104	207
Consumer Direct [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	3
Consumer Direct [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	0	0
Consumer Indirect [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Nonaccrual	0	0
Consumer Indirect [Member] | Current [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	280	366
Consumer Indirect [Member] | 30 to 89 Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	64	29
Consumer Indirect [Member] | 90+ Days Past Due [Member]
Payment Status of Modified Loans to Borrowers Experiencing Financial Difficulty [Abstract]
Modified loans to borrowers experiencing financial difficulty	$ 0	$ 0