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Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Mar. 31, 2021
--- | --- | ---
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 243,068 | $ 224,760
Commitments to grant loans [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 82,432 | 82,444
Unfunded commitments under lines of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 151,759 | 136,710
Standby letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 8,877 | $ 5,606

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