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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