Loans and Allowance for Loan Losses - Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	$ 178,714	$ 61,339
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	95,683	60,223
Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	511	0
Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	82,520	1,116
Total commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	169,131	59,348
Total commercial and industrial | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	88,491	58,759
Total commercial and industrial | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	79	0
Total commercial and industrial | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	80,561	589
Total commercial and industrial | Commercial, financial and agricultural
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	134,551	16,617
Total commercial and industrial | Commercial, financial and agricultural | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	54,662	16,028
Total commercial and industrial | Commercial, financial and agricultural | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	79	0
Total commercial and industrial | Commercial, financial and agricultural | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Commercial, financial and agricultural | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	79,810	589
Total commercial and industrial | Owner-occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	34,580	42,731
Total commercial and industrial | Owner-occupied | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	33,829	42,731
Total commercial and industrial | Owner-occupied | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Owner-occupied | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial and industrial | Owner-occupied | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	751	0
Total commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	4,654	1,339
Total commercial real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	4,312	1,339
Total commercial real estate | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	342	0
Total commercial real estate | Investment properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	3,130	0
Total commercial real estate | Investment properties | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	3,130	0
Total commercial real estate | Investment properties | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Investment properties | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Investment properties | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | 1-4 family properties
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	407	1,339
Total commercial real estate | 1-4 family properties | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	65	1,339
Total commercial real estate | 1-4 family properties | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | 1-4 family properties | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | 1-4 family properties | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	342	0
Total commercial real estate | Land and development
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	1,117	0
Total commercial real estate | Land and development | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	1,117	0
Total commercial real estate | Land and development | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Land and development | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total commercial real estate | Land and development | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	4,929	652
Total consumer | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	2,880	125
Total consumer | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	432	0
Total consumer | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	1,617	527
Total consumer | Consumer mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	2,787	113
Total consumer | Consumer mortgages | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	1,230	0
Total consumer | Consumer mortgages | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	187	0
Total consumer | Consumer mortgages | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Consumer mortgages | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	1,370	113
Total consumer | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	618	103
Total consumer | Home equity | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	618	103
Total consumer | Home equity | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Home equity | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Home equity | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Credit cards | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Other consumer loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	1,524	436
Total consumer | Other consumer loans | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	1,032	22
Total consumer | Other consumer loans | Accruing 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	245	0
Total consumer | Other consumer loans | Accruing 90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	0	0
Total consumer | Other consumer loans | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis of loans, aging analysis	$ 247	$ 414