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Investment securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, less than 12 months, fair value | $ 13,143,000 | $ 662,000
AFS, less than 12 months, gross unrealized losses | 150,000 | 3,000
AFS, 12 months or longer, fair value | 1,093,000 | 1,554,000
AFS, 12 months or longer, gross unrealized losses | 62,000 | 59,000
Fair Value | 14,236,000 | 2,216,000
Unrealized Losses | 212,000 | 62,000
Total investment securities, less than 12 months, fair value | 15,154,000 | 844,000
Total investment securities, less than 12 months, gross unrealized losses | 180,000 | 4,000
Total investment securities, 12 months or longer, fair value | 9,479,000 | 11,938,000
Total investment securities, 12 months or longer, gross unrealized losses | 833,000 | 795,000
Fair Value | 24,633,000 | 12,782,000
Unrealized Losses | 1,013,000 | 799,000
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, less than 12 months, fair value | 2,011,000 | 182,000
HTM, Less than 12 months, gross unrealized losses | 30,000 | 1,000
HTM, 12 months or longer, fair value | 8,386,000 | 10,384,000
HTM, 12 months or longer, gross unrealized losses | 771,000 | 736,000
Fair Value | 10,397,000 | 10,566,000
Unrealized Losses | 801,000 | 737,000
U.S. Treasury |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, less than 12 months, fair value | 1,388,000 | 0
AFS, less than 12 months, gross unrealized losses | 4,000 | 0
AFS, 12 months or longer, fair value | 0 | 185,000
AFS, 12 months or longer, gross unrealized losses | 0 | 2,000
Fair Value | 1,388,000 | 185,000
Unrealized Losses | 4,000 | 2,000
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, less than 12 months, fair value | 0 | 0
HTM, Less than 12 months, gross unrealized losses | 0 | 0
HTM, 12 months or longer, fair value | 395,000 | 391,000
HTM, 12 months or longer, gross unrealized losses | 3,000 | 4,000
Fair Value | 395,000 | 391,000
Unrealized Losses | 3,000 | 4,000
Commercial |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, less than 12 months, fair value | 1,961,000 | 174,000
AFS, less than 12 months, gross unrealized losses | 11,000 | 1,000
AFS, 12 months or longer, fair value | 1,000 | 65,000
AFS, 12 months or longer, gross unrealized losses | 0 | 0
Fair Value | 1,962,000 | 239,000
Unrealized Losses | 11,000 | 1,000
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, less than 12 months, fair value | 272,000 | 28,000
HTM, Less than 12 months, gross unrealized losses | 6,000 | 0
HTM, 12 months or longer, fair value | 1,632,000 | 1,840,000
HTM, 12 months or longer, gross unrealized losses | 86,000 | 74,000
Fair Value | 1,904,000 | 1,868,000
Unrealized Losses | 92,000 | 74,000
Residential (b) |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, less than 12 months, fair value | 9,794,000 | 488,000
AFS, less than 12 months, gross unrealized losses | 135,000 | 2,000
AFS, 12 months or longer, fair value | 1,091,000 | 1,303,000
AFS, 12 months or longer, gross unrealized losses | 62,000 | 57,000
Fair Value | 10,885,000 | 1,791,000
Unrealized Losses | 197,000 | 59,000
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, less than 12 months, fair value | 1,231,000 | 139,000
HTM, Less than 12 months, gross unrealized losses | 19,000 | 1,000
HTM, 12 months or longer, fair value | 5,110,000 | 6,287,000
HTM, 12 months or longer, gross unrealized losses | 644,000 | 618,000
Fair Value | 6,341,000 | 6,426,000
Unrealized Losses | 663,000 | 619,000
Other |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, less than 12 months, fair value | 0 | 0
AFS, less than 12 months, gross unrealized losses | 0 | 0
AFS, 12 months or longer, fair value | 1,000 | 1,000
AFS, 12 months or longer, gross unrealized losses | 0 | 0
Fair Value | 1,000 | 1,000
Unrealized Losses | 0 | 0
State and political subdivisions |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, less than 12 months, fair value | 508,000 | 13,000
HTM, Less than 12 months, gross unrealized losses | 5,000 | 0
HTM, 12 months or longer, fair value | 1,248,000 | 1,866,000
HTM, 12 months or longer, gross unrealized losses | 38,000 | 40,000
Fair Value | 1,756,000 | 1,879,000
Unrealized Losses | 43,000 | 40,000
Privately issued |  |
Schedule of Held-to-Maturity Securities [Line Items] |  |
HTM, less than 12 months, fair value | 0 | 2,000
HTM, Less than 12 months, gross unrealized losses | 0 | 0
HTM, 12 months or longer, fair value | 1,000 | 0
HTM, 12 months or longer, gross unrealized losses | 0 | 0
Fair Value | 1,000 | 2,000
Unrealized Losses | $ 0 | $ 0

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