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Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than twelve months, fair value | $ 2,573 | $ 2,566
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss | (17) | (50)
Twelve months or longer, fair value | 109,356 | 112,441
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss | (15,272) | (19,054)
Total, fair value | 111,929 | 115,007
Debt securities, held-to-maturity, unrealized loss position, accumulated loss | (15,289) | (19,104)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Less than twelve months, fair value | 26,758 | 65,044
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (153) | (905)
Twelve months or longer, fair value | 259,718 | 206,756
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (34,729) | (38,670)
Total, fair value | 286,476 | 271,800
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (34,882) | (39,575)
Residential mortgage-backed securities |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than twelve months, fair value | 2,573 | 2,566
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss | (17) | (50)
Twelve months or longer, fair value | 109,356 | 112,441
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss | (15,272) | (19,054)
Total, fair value | 111,929 | 115,007
Debt securities, held-to-maturity, unrealized loss position, accumulated loss | (15,289) | (19,104)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Less than twelve months, fair value | 25,762 | 65,044
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (151) | (905)
Twelve months or longer, fair value | 201,199 | 205,071
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (30,692) | (38,537)
Total, fair value | 226,961 | 270,115
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (30,843) | (39,442)
Collateralized mortgage obligations |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Less than twelve months, fair value | 0 | 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | 0 | 0
Twelve months or longer, fair value | 1,542 | 1,685
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (99) | (133)
Total, fair value | 1,542 | 1,685
Available-for-sale securities, continuous unrealized loss position, accumulated loss | (99) | $ (133)
Corporate bonds |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] |  |
Less than twelve months, fair value | 996 |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss | (2) |
Twelve months or longer, fair value | 56,977 |
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss | (3,938) |
Total, fair value | 57,973 |
Available-for-sale securities, continuous unrealized loss position, accumulated loss | $ (3,940) |

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