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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)