v3.26.1
Investment and Equity Securities - Gross Unrealized Losses and Fair Value of Investments (Detail)
$ in Thousands
Jun. 30, 2026
USD ($)
Security
Dec. 31, 2025
USD ($)
Security
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Number of Securities | Security 44 27
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value $ 80,598 $ 42,268
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses $ 1,018 $ 348
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Number of Securities | Security 150 157
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value $ 198,830 $ 218,303
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 22,132 22,610
Available-for-sale Securities, Gross unrealized losses, Fair Value 279,428 260,571
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 23,150 $ 22,958
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Number of Securities | Security 5 5
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value $ 23,776 $ 23,997
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 1,860 1,756
Available-for-sale Securities, Gross unrealized losses, Fair Value 23,776 23,997
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 1,860 $ 1,756
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Number of Securities | Security 13 11
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value $ 16,548 $ 13,378
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses $ 100 $ 56
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Number of Securities | Security 31 28
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value $ 21,777 $ 18,932
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 671 673
Available-for-sale Securities, Gross unrealized losses, Fair Value 38,325 32,310
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 771 $ 729
GSE - Mortgage-backed Securities and CMO's [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Number of Securities | Security 19 11
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value $ 46,572 $ 23,048
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses $ 731 $ 177
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Number of Securities | Security 53 61
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value $ 76,045 $ 94,444
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 7,998 7,996
Available-for-sale Securities, Gross unrealized losses, Fair Value 122,617 117,492
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 8,729 $ 8,173
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Number of Securities | Security 4 1
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value $ 3,860 $ 466
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses $ 26 $ 2
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Number of Securities | Security 2 4
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value $ 1,861 $ 4,316
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 26 30
Available-for-sale Securities, Gross unrealized losses, Fair Value 5,721 4,782
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 52 $ 32
State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Number of Securities | Security 8 4
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value $ 13,618 $ 5,376
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses $ 161 $ 113
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Number of Securities | Security 57 57
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value $ 71,421 $ 72,704
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 11,527 12,065
Available-for-sale Securities, Gross unrealized losses, Fair Value 85,039 78,080
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 11,688 $ 12,178
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Number of Securities | Security 2 2
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value $ 3,950 $ 3,910
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 50 90
Available-for-sale Securities, Gross unrealized losses, Fair Value 3,950 3,910
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 50 $ 90