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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 129,467 | $ 159,675
12 Months or less, Unrealized Loss | (1,972) | (1,186)
More than 12 months, Fair Value | 416,152 | 414,841
More than 12 months, Unrealized Loss | (59,282) | (61,687)
Total Fair Value | 545,619 | 574,516
Total Unrealized Loss | (61,254) | (62,873)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 2,524 | 32,388
12 Months or less, Unrealized Loss | (13) | (51)
More than 12 months, Fair Value | 53,914 | 55,000
More than 12 months, Unrealized Loss | (2,428) | (3,243)
Total Fair Value | 56,438 | 87,388
Total Unrealized Loss | (2,441) | (3,294)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 115,829 | 98,965
12 Months or less, Unrealized Loss | (1,840) | (806)
More than 12 months, Fair Value | 176,930 | 173,668
More than 12 months, Unrealized Loss | (28,832) | (26,192)
Total Fair Value | 292,759 | 272,633
Total Unrealized Loss | (30,672) | (26,998)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 11,114 | 28,322
12 Months or less, Unrealized Loss | (119) | (329)
More than 12 months, Fair Value | 185,308 | 186,173
More than 12 months, Unrealized Loss | (28,022) | (32,252)
Total Fair Value | 196,422 | 214,495
Total Unrealized Loss | $ (28,141) | $ (32,581)

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