Loans and Allowance for Credit Losses - Summary Of Risk Category of Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		$ 67,610
2022		88,079
2021		88,447
Prior		102,988
Revolving Loans		28,924
Total Loans		376,048
Total loans		376,048		$ 353,687
Current year-to-date gross write-offs, Total Loans	$ 2,448		$ 2,448
Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				349,095
Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				4,592
Residential | 1-4 Family Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				119,610
Residential | 1-4 Family Residential | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				118,839
Residential | 1-4 Family Residential | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				771
Residential | Multi Family Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				34,296
Residential | Multi Family Residential | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				34,296
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Current year-to-date gross write-offs, Total Loans		1
Real Estate | Real Estate - Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		6,129
2022		2,011
Prior		1,832
Total Loans		9,972
Real Estate | Real Estate - Construction | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		6,129
2022		2,011
Prior		1,832
Total Loans		9,972
Real Estate | Real Estate - Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		22,598
2022		29,857
2021		24,390
Prior		40,545
Revolving Loans		6,364
Total Loans		123,754
Total loans				102,446
Real Estate | Real Estate - Commercial | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		22,598
2022		29,857
2021		24,390
Prior		37,740
Revolving Loans		6,364
Total Loans		120,949
Total loans				99,367
Real Estate | Real Estate - Commercial | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Prior		2,805
Total Loans		2,805
Total loans				3,079
Real Estate | Real Estate - Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		16,095
2022		31,469
2021		51,976
Prior		40,220
Revolving Loans		11,455
Total Loans		151,215
Real Estate | Real Estate - Residential | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		16,011
2022		31,469
2021		51,976
Prior		39,842
Revolving Loans		11,455
Total Loans		150,753
Real Estate | Real Estate - Residential | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Prior		378
Total Loans		378
Real Estate | Real Estate - Residential | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		84
Total Loans		84
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		7,153
2022		8,145
2021		2,243
Prior		12,149
Revolving Loans		4,378
Total Loans		34,068
Total loans		34,068		30,101
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		7,153
2022		8,009
2021		2,243
Prior		11,685
Revolving Loans		4,378
Total Loans		33,468
Total loans				29,390
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2022		136
Prior		445
Total Loans		581
Total loans				711
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
Prior		19
Total Loans		19
Agricultural Portfolio Segment | Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		1,313
2022		3,708
2021		2,647
Prior		4,158
Revolving Loans		6,527
Total Loans		18,353
Total loans		18,353
Agricultural Portfolio Segment | Agricultural | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		1,313
2022		3,708
2021		2,647
Prior		4,158
Revolving Loans		6,527
Total Loans		18,353
Agricultural Portfolio Segment | Agriculture Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				9,245
Agricultural Portfolio Segment | Agriculture Real Estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				9,245
Agricultural Portfolio Segment | Agricultural Non-Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				8,921
Agricultural Portfolio Segment | Agricultural Non-Real Estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				8,921
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Current year-to-date gross write-offs, Total Loans		1
Consumer Portfolio Segment | Other Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		13,468
2022		5,441
2021		982
Prior		2,617
Total Loans		22,508
Total loans		22,508		14,334
Current year-to-date gross write-offs, 2022		1
Current year-to-date gross write-offs, Total Loans		1
Consumer Portfolio Segment | Other Consumer | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		13,462
2022		5,436
2021		940
Prior		2,617
Total Loans		22,455
Total loans				14,334
Consumer Portfolio Segment | Other Consumer | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		6
2022		5
2021		42
Total Loans		53
Consumer Portfolio Segment | Consumer Auto
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				5,622
Consumer Portfolio Segment | Consumer Auto | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				5,591
Consumer Portfolio Segment | Consumer Auto | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				31
Construction and Land Development | Non One to Four Family Construction and Development
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				23,644
Construction and Land Development | Non One to Four Family Construction and Development | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				23,644
Land Development And SIDs Portfolio Segment | Land Development and SIDs
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		854
2022		7,448
2021		6,209
Prior		1,467
Revolving Loans		200
Total Loans		16,178
Total loans		16,178
Land Development And SIDs Portfolio Segment | Land Development and SIDs | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
2023		854
2022		7,448
2021		6,209
Prior		1,467
Revolving Loans		200
Total Loans		$ 16,178
Land Development And SIDs Portfolio Segment | Sanitary & Improvement Districts
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				5,468
Land Development And SIDs Portfolio Segment | Sanitary & Improvement Districts | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans				$ 5,468