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	9 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	$ 60,557		$ 64,635
Fiscal Year before Current Fiscal Year	52,604		82,736
Two Years before Current Fiscal Year	66,051		92,303
Three Years before Current Fiscal Year	86,415		44,091
Four Years before Current Fiscal Year	39,054		24,255
Prior	58,444		50,575
Revolving Loans	41,799		21,650
Total Loans	404,924		380,245
Total	4	$ 1
Real Estate | Real Estate - Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	6,774		10,822
Fiscal Year before Current Fiscal Year	8,742		3,231
Two Years before Current Fiscal Year	368
Revolving Loans	1,924		1,958
Total Loans	17,808		16,011
Real Estate | Real Estate - Construction | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	6,774		10,822
Fiscal Year before Current Fiscal Year	8,742		3,231
Two Years before Current Fiscal Year	368
Revolving Loans	1,924		1,958
Total Loans	17,808		16,011
Real Estate | Real Estate - Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	17,416		17,277
Fiscal Year before Current Fiscal Year	16,666		30,294
Two Years before Current Fiscal Year	24,718		27,294
Three Years before Current Fiscal Year	26,358		5,988
Four Years before Current Fiscal Year	3,457		15,873
Prior	32,633		26,343
Revolving Loans	3,374		244
Total Loans	124,622		123,313
Real Estate | Real Estate - Commercial | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	17,416		16,878
Fiscal Year before Current Fiscal Year	14,310		30,294
Two Years before Current Fiscal Year	24,718		27,294
Three Years before Current Fiscal Year	26,358		5,646
Four Years before Current Fiscal Year	3,142		15,873
Prior	31,119		24,740
Revolving Loans	3,374		244
Total Loans	120,437		120,969
Real Estate | Real Estate - Commercial | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year			399
Fiscal Year before Current Fiscal Year	2,356
Three Years before Current Fiscal Year			342
Four Years before Current Fiscal Year	315
Prior	1,514		1,603
Total Loans	4,185		2,344
Real Estate | Real Estate - Residential
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	16,081		16,391
Fiscal Year before Current Fiscal Year	11,692		25,438
Two Years before Current Fiscal Year	21,580		49,959
Three Years before Current Fiscal Year	46,837		33,193
Four Years before Current Fiscal Year	31,656		4,688
Prior	13,600		12,859
Revolving Loans	13,381		7,326
Total Loans	154,827		149,854
Real Estate | Real Estate - Residential | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	16,081		16,391
Fiscal Year before Current Fiscal Year	11,692		25,357
Two Years before Current Fiscal Year	21,439		49,959
Three Years before Current Fiscal Year	46,837		33,193
Four Years before Current Fiscal Year	31,656		4,688
Prior	13,484		12,740
Revolving Loans	13,381		7,326
Total Loans	154,570		149,654
Real Estate | Real Estate - Residential | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Two Years before Current Fiscal Year	141
Prior	116		119
Total Loans	257		119
Real Estate | Real Estate - Residential | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
Fiscal Year before Current Fiscal Year			81
Total Loans			81
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	3,370		8,111
Fiscal Year before Current Fiscal Year	6,887		5,273
Two Years before Current Fiscal Year	3,807		4,228
Three Years before Current Fiscal Year	3,102		2,841
Four Years before Current Fiscal Year	1,969		1,101
Prior	7,292		7,701
Revolving Loans	4,072		5,792
Total Loans	30,499		35,047
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	3,370		8,111
Fiscal Year before Current Fiscal Year	6,887		5,140
Two Years before Current Fiscal Year	3,683		4,228
Three Years before Current Fiscal Year	3,102		2,841
Four Years before Current Fiscal Year	1,969		1,101
Prior	6,898		7,356
Revolving Loans	4,072		5,712
Total Loans	29,981		34,489
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Fiscal Year before Current Fiscal Year			133
Two Years before Current Fiscal Year	124
Prior	394		329
Revolving Loans			80
Total Loans	518		542
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
Prior			16
Total Loans			16
Agricultural Portfolio Segment | Agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	13,630		3,391
Fiscal Year before Current Fiscal Year	1,856		3,283
Two Years before Current Fiscal Year	3,183		2,537
Three Years before Current Fiscal Year	2,345		1,037
Four Years before Current Fiscal Year	1,141		587
Prior	2,888		2,729
Revolving Loans	19,048		6,130
Total Loans	44,091		19,694
Agricultural Portfolio Segment | Agricultural | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	13,630		3,391
Fiscal Year before Current Fiscal Year	1,856		3,283
Two Years before Current Fiscal Year	3,183		2,537
Three Years before Current Fiscal Year	2,345		1,037
Four Years before Current Fiscal Year	1,141		587
Prior	2,888		2,729
Revolving Loans	19,048		6,130
Total Loans	44,091		19,694
Consumer Portfolio Segment | Other Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	2,451		8,030
Fiscal Year before Current Fiscal Year	5,639		8,441
Two Years before Current Fiscal Year	6,009		980
Three Years before Current Fiscal Year	460		318
Four Years before Current Fiscal Year	273		2,006
Prior	1,251		210
Total Loans	16,083		19,985
Current Fiscal Year, Gross Write off	4		6
Total	4		6
Consumer Portfolio Segment | Other Consumer | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	2,446		8,020
Fiscal Year before Current Fiscal Year	5,639		8,436
Two Years before Current Fiscal Year	6,009		966
Three Years before Current Fiscal Year	460		304
Four Years before Current Fiscal Year	267		2,006
Prior	1,243		210
Total Loans	16,064		19,942
Consumer Portfolio Segment | Other Consumer | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	5		10
Fiscal Year before Current Fiscal Year			5
Two Years before Current Fiscal Year			14
Three Years before Current Fiscal Year			14
Four Years before Current Fiscal Year	6
Prior	8
Total Loans	19		43
Land Development And SIDs Portfolio Segment | Land Development and SIDs
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	835		613
Fiscal Year before Current Fiscal Year	1,122		6,776
Two Years before Current Fiscal Year	6,386		7,305
Three Years before Current Fiscal Year	7,313		714
Four Years before Current Fiscal Year	558
Prior	780		733
Revolving Loans			200
Total Loans	16,994		16,341
Land Development And SIDs Portfolio Segment | Land Development and SIDs | Pass
Financing Receivable, Allowance for Credit Loss [Line Items]
Current fiscal year	835		613
Fiscal Year before Current Fiscal Year	1,122		6,776
Two Years before Current Fiscal Year	6,386		7,305
Three Years before Current Fiscal Year	5,965		714
Four Years before Current Fiscal Year	558
Prior	780		733
Revolving Loans			200
Total Loans	15,646		$ 16,341
Land Development And SIDs Portfolio Segment | Land Development and SIDs | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Three Years before Current Fiscal Year	1,248
Total Loans	1,248
Land Development And SIDs Portfolio Segment | Land Development and SIDs | Doubtful
Financing Receivable, Allowance for Credit Loss [Line Items]
Three Years before Current Fiscal Year	100
Total Loans	$ 100