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Loans and Allowance for Credit Losses - Summary of Credit Risk Profile of Loans Portfolio Based on Risk Category and Year of Origination (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | $ 43,704 |  | $ 43,704 |  | $ 73,388
Fiscal Year before Current Fiscal Year | 71,735 |  | 71,735 |  | 51,000
Two Years before Current Fiscal Year | 41,182 |  | 41,182 |  | 69,291
Three Years before Current Fiscal Year | 62,438 |  | 62,438 |  | 83,146
Four Years before Current Fiscal Year | 78,990 |  | 78,990 |  | 38,073
Prior | 87,662 |  | 87,662 |  | 56,184
Revolving Loans | 36,664 |  | 36,664 |  | 31,133
Total loans | 422,375 |  | 422,375 |  | 402,215
Total | 7 | $ 0 | 7 | $ 4 |
Real Estate | Real Estate - Construction |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 5,620 |  | 5,620 |  | 9,809
Fiscal Year before Current Fiscal Year | 10,150 |  | 10,150 |  | 2,908
Two Years before Current Fiscal Year | 2,005 |  | 2,005 |  | 367
Revolving Loans | 1,472 |  | 1,472 |  | 1,985
Total loans | 19,247 |  | 19,247 |  | 15,069
Real Estate | Real Estate - Construction | Pass |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 5,620 |  | 5,620 |  | 9,809
Fiscal Year before Current Fiscal Year | 10,150 |  | 10,150 |  | 2,908
Two Years before Current Fiscal Year | 2,005 |  | 2,005 |  | 367
Revolving Loans | 1,472 |  | 1,472 |  | 1,985
Total loans | 19,247 |  | 19,247 |  | 15,069
Real Estate | Real Estate - Commercial |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 7,812 |  | 7,812 |  | 17,451
Fiscal Year before Current Fiscal Year | 20,480 |  | 20,480 |  | 14,544
Two Years before Current Fiscal Year | 13,843 |  | 13,843 |  | 26,916
Three Years before Current Fiscal Year | 26,113 |  | 26,113 |  | 25,840
Four Years before Current Fiscal Year | 25,277 |  | 25,277 |  | 3,395
Prior | 33,405 |  | 33,405 |  | 31,898
Revolving Loans | 63 |  | 63 |  | 140
Total loans | 126,993 |  | 126,993 |  | 120,184
Real Estate | Real Estate - Commercial | Pass |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 7,812 |  | 7,812 |  | 17,451
Fiscal Year before Current Fiscal Year | 20,153 |  | 20,153 |  | 14,153
Two Years before Current Fiscal Year | 13,843 |  | 13,843 |  | 26,916
Three Years before Current Fiscal Year | 26,113 |  | 26,113 |  | 25,840
Four Years before Current Fiscal Year | 25,277 |  | 25,277 |  | 3,089
Prior | 31,667 |  | 31,667 |  | 30,409
Revolving Loans | 63 |  | 63 |  | 140
Total loans | 124,928 |  | 124,928 |  | 117,998
Real Estate | Real Estate - Commercial | Substandard |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Fiscal Year before Current Fiscal Year | 327 |  | 327 |  | 391
Four Years before Current Fiscal Year |  |  |  |  | 306
Prior | 1,738 |  | 1,738 |  | 1,489
Total loans | 2,065 |  | 2,065 |  | 2,186
Real Estate | Real Estate - Residential |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 11,406 |  | 11,406 |  | 18,914
Fiscal Year before Current Fiscal Year | 16,228 |  | 16,228 |  | 19,970
Two Years before Current Fiscal Year | 13,967 |  | 13,967 |  | 22,809
Three Years before Current Fiscal Year | 21,072 |  | 21,072 |  | 46,132
Four Years before Current Fiscal Year | 44,229 |  | 44,229 |  | 31,265
Prior | 41,659 |  | 41,659 |  | 12,976
Revolving Loans | 10,074 |  | 10,074 |  | 9,078
Total loans | 158,635 |  | 158,635 |  | 161,144
Real Estate | Real Estate - Residential | Pass |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 11,406 |  | 11,406 |  | 18,914
Fiscal Year before Current Fiscal Year | 16,228 |  | 16,228 |  | 19,970
Two Years before Current Fiscal Year | 13,943 |  | 13,943 |  | 22,674
Three Years before Current Fiscal Year | 21,072 |  | 21,072 |  | 46,132
Four Years before Current Fiscal Year | 44,213 |  | 44,213 |  | 31,265
Prior | 41,452 |  | 41,452 |  | 12,861
Revolving Loans | 10,074 |  | 10,074 |  | 9,078
Total loans | 158,388 |  | 158,388 |  | 160,894
Real Estate | Real Estate - Residential | Substandard |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Two Years before Current Fiscal Year | 24 |  | 24 |  | 135
Four Years before Current Fiscal Year | 16 |  | 16 |  |
Prior | 207 |  | 207 |  | 115
Total loans | 247 |  | 247 |  | 250
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 10,643 |  | 10,643 |  | 6,549
Fiscal Year before Current Fiscal Year | 5,827 |  | 5,827 |  | 5,670
Two Years before Current Fiscal Year | 4,412 |  | 4,412 |  | 3,735
Three Years before Current Fiscal Year | 2,710 |  | 2,710 |  | 2,790
Four Years before Current Fiscal Year | 1,934 |  | 1,934 |  | 1,775
Prior | 7,410 |  | 7,410 |  | 6,937
Revolving Loans | 5,756 |  | 5,756 |  | 4,551
Total loans | 38,692 |  | 38,692 |  | 32,007
Current Fiscal Year, Gross Write off |  |  |  |  | 13
Total |  |  |  |  | 13
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Pass |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 10,643 |  | 10,643 |  | 6,549
Fiscal Year before Current Fiscal Year | 5,827 |  | 5,827 |  | 5,670
Two Years before Current Fiscal Year | 4,412 |  | 4,412 |  | 3,613
Three Years before Current Fiscal Year | 2,595 |  | 2,595 |  | 2,790
Four Years before Current Fiscal Year | 1,934 |  | 1,934 |  | 1,775
Prior | 7,158 |  | 7,158 |  | 6,563
Revolving Loans | 5,656 |  | 5,656 |  | 4,551
Total loans | 38,225 |  | 38,225 |  | 31,511
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Substandard |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Two Years before Current Fiscal Year |  |  |  |  | 122
Three Years before Current Fiscal Year | 115 |  | 115 |  |
Prior | 252 |  | 252 |  | 374
Revolving Loans | 100 |  | 100 |  |
Total loans | 467 |  | 467 |  | 496
Agricultural Portfolio Segment | Agricultural |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 5,971 |  | 5,971 |  | 17,040
Fiscal Year before Current Fiscal Year | 15,749 |  | 15,749 |  | 1,763
Two Years before Current Fiscal Year | 1,842 |  | 1,842 |  | 3,092
Three Years before Current Fiscal Year | 3,039 |  | 3,039 |  | 2,069
Four Years before Current Fiscal Year | 2,015 |  | 2,015 |  | 857
Prior | 3,223 |  | 3,223 |  | 2,635
Revolving Loans | 19,299 |  | 19,299 |  | 15,379
Total loans | 51,138 |  | 51,138 |  | 42,835
Agricultural Portfolio Segment | Agricultural | Pass |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 5,971 |  | 5,971 |  | 16,635
Fiscal Year before Current Fiscal Year | 15,402 |  | 15,402 |  | 1,763
Two Years before Current Fiscal Year | 1,842 |  | 1,842 |  | 2,927
Three Years before Current Fiscal Year | 2,874 |  | 2,874 |  | 2,069
Four Years before Current Fiscal Year | 2,015 |  | 2,015 |  | 857
Prior | 3,223 |  | 3,223 |  | 2,635
Revolving Loans | 18,790 |  | 18,790 |  | 15,078
Total loans | 50,117 |  | 50,117 |  | 41,964
Agricultural Portfolio Segment | Agricultural | Substandard |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year |  |  |  |  | 405
Fiscal Year before Current Fiscal Year | 347 |  | 347 |  |
Two Years before Current Fiscal Year |  |  |  |  | 165
Three Years before Current Fiscal Year | 165 |  | 165 |  |
Revolving Loans | 509 |  | 509 |  | 301
Total loans | 1,021 |  | 1,021 |  | 871
Consumer Portfolio Segment | Other Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 1,480 |  | 1,480 |  | 2,784
Fiscal Year before Current Fiscal Year | 2,018 |  | 2,018 |  | 5,021
Two Years before Current Fiscal Year | 3,971 |  | 3,971 |  | 5,252
Three Years before Current Fiscal Year | 3,965 |  | 3,965 |  | 359
Four Years before Current Fiscal Year | 221 |  | 221 |  | 229
Prior | 784 |  | 784 |  | 1,004
Total loans | 12,439 |  | 12,439 |  | 14,649
Current Fiscal Year, Gross Write off |  |  | 7 |  | 4
Total |  |  | 7 |  | 4
Consumer Portfolio Segment | Other Consumer | Pass |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 1,480 |  | 1,480 |  | 2,779
Fiscal Year before Current Fiscal Year | 1,975 |  | 1,975 |  | 5,021
Two Years before Current Fiscal Year | 3,971 |  | 3,971 |  | 5,252
Three Years before Current Fiscal Year | 3,965 |  | 3,965 |  | 359
Four Years before Current Fiscal Year | 218 |  | 218 |  | 224
Prior | 784 |  | 784 |  | 996
Total loans | 12,393 |  | 12,393 |  | 14,631
Consumer Portfolio Segment | Other Consumer | Substandard |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Fiscal Year before Current Fiscal Year | 43 |  | 43 |  |
Four Years before Current Fiscal Year | 3 |  | 3 |  | 5
Prior |  |  |  |  | 8
Total loans | 46 |  | 46 |  | 13
Consumer Portfolio Segment | Other Consumer | Doubtful |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year |  |  |  |  | 5
Total loans |  |  |  |  | 5
Land Development And SIDs Portfolio Segment | Land Development and SIDs |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 772 |  | 772 |  | 841
Fiscal Year before Current Fiscal Year | 1,283 |  | 1,283 |  | 1,124
Two Years before Current Fiscal Year | 1,142 |  | 1,142 |  | 7,120
Three Years before Current Fiscal Year | 5,539 |  | 5,539 |  | 5,956
Four Years before Current Fiscal Year | 5,314 |  | 5,314 |  | 552
Prior | 1,181 |  | 1,181 |  | 734
Total loans | 15,231 |  | 15,231 |  | 16,327
Current Fiscal Year, Gross Write off |  |  |  |  | 605
Total |  |  |  |  | 605
Land Development And SIDs Portfolio Segment | Land Development and SIDs | Pass |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Current fiscal year | 772 |  | 772 |  | 841
Fiscal Year before Current Fiscal Year | 1,283 |  | 1,283 |  | 1,124
Two Years before Current Fiscal Year | 1,142 |  | 1,142 |  | 6,313
Three Years before Current Fiscal Year | 5,539 |  | 5,539 |  | 5,956
Four Years before Current Fiscal Year | 5,249 |  | 5,249 |  | 552
Prior | 1,181 |  | 1,181 |  | 734
Total loans | 15,166 |  | 15,166 |  | 15,520
Land Development And SIDs Portfolio Segment | Land Development and SIDs | Substandard |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Two Years before Current Fiscal Year |  |  |  |  | 807
Four Years before Current Fiscal Year | 65 |  | 65 |  |
Total loans | $ 65 |  | $ 65 |  | $ 807

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