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Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Credit Losses (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] |  |  |  |  |
Beginning Allowance Balance | $ 5,439 | $ 5,852 | $ 5,441 | $ 5,860 | $ 5,860
Provision for (reversal of) credit losses | 89 | 4 | 86 | (1) |
Loans Charged off | (7) | 0 | (7) | (4) |
Recoveries | 2 | 2 | 3 | 3 |
Ending Allowance Balance | 5,523 | 5,858 | 5,523 | 5,858 | 5,441
Real Estate | Construction |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Allowance Balance | 246 | 268 | 246 | 246 | 246
Provision for (reversal of) credit losses | 39 | 21 | 39 | 43 |
Ending Allowance Balance | 285 | 289 | 285 | 289 | 246
Real Estate | Commercial |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Allowance Balance | 1,572 | 2,044 | 1,572 | 2,245 | 2,245
Provision for (reversal of) credit losses | 116 | (21) | 116 | (222) |
Ending Allowance Balance | 1,688 | 2,023 | 1,688 | 2,023 | 1,572
Real Estate | Residential |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Allowance Balance | 1,925 | 1,907 | 1,926 | 1,829 | 1,829
Provision for (reversal of) credit losses | (125) | (31) | (126) | 47 |
Ending Allowance Balance | 1,800 | 1,876 | 1,800 | 1,876 | 1,926
Commercial | Non-Real Estate |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Allowance Balance | 667 | 711 | 667 | 759 | 759
Provision for (reversal of) credit losses | 128 | (53) | 128 | (101) |
Ending Allowance Balance | 795 | 658 | 795 | 658 | 667
Agriculture |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Allowance Balance | 476 | 284 | 476 | 228 | 228
Provision for (reversal of) credit losses | 83 | 122 | 83 | 178 |
Ending Allowance Balance | 559 | 406 | 559 | 406 | 476
Other Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Allowance Balance | 261 | 392 | 262 | 327 | 327
Provision for (reversal of) credit losses | (88) | (24) | (90) | 44 |
Loans Charged off | (7) | 0 | (7) | (4) |
Recoveries | 2 | 2 | 3 | 3 |
Ending Allowance Balance | 168 | 370 | 168 | 370 | 262
Land Development and SIDs |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Beginning Allowance Balance | 292 | 246 | 292 | 226 | 226
Provision for (reversal of) credit losses | (64) | (10) | (64) | 10 |
Ending Allowance Balance | $ 228 | $ 236 | $ 228 | $ 236 | $ 292

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