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Fair value measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2026 | Jan. 01, 2026 | Dec. 31, 2025 | Mar. 31, 2025
--- | --- | --- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Residential mortgage loan servicing rights | $ 540,000 | $ 263,000 |  | $ 542,000
Fair Value Measurements |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 25,370,000 |  | $ 23,202,000 |
Equity securities | 245,000 |  | 281,000 |
Real estate loans held for sale | 515,000 |  | 925,000 |
Other assets | 332,000 |  | 342,000 |
Total assets | 27,002,000 |  | 24,750,000 |
Other liabilities | 503,000 |  | 454,000 |
Total liabilities | 503,000 |  | 454,000 |
Fair Value Measurements | U.S. Treasury |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 3,227,000 |  | 6,343,000 |
Fair Value Measurements | Commercial |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 4,755,000 |  | 4,816,000 |
Fair Value Measurements | Residential |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 17,387,000 |  | 12,042,000 |
Fair Value Measurements | Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 1,000 |  | 1,000 |
Fair Value Measurements | Residential Mortgage Loans |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Residential mortgage loan servicing rights | 540,000 |  |  |
Level 1 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Equity securities | 245,000 |  | 281,000 |
Real estate loans held for sale | 0 |  | 0 |
Other assets | 13,000 |  | 12,000 |
Total assets | 258,000 |  | 293,000 |
Other liabilities | 0 |  | 0 |
Total liabilities | 0 |  | 0 |
Level 1 | U.S. Treasury |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Level 1 | Commercial |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Level 1 | Residential |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Level 1 | Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Level 1 | Residential Mortgage Loans |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Residential mortgage loan servicing rights | 0 |  |  |
Level 2 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 25,370,000 |  | 23,202,000 |
Equity securities | 0 |  | 0 |
Real estate loans held for sale | 515,000 |  | 925,000 |
Other assets | 315,000 |  | 327,000 |
Total assets | 26,200,000 |  | 24,454,000 |
Other liabilities | 503,000 |  | 454,000 |
Total liabilities | 503,000 |  | 454,000 |
Level 2 | U.S. Treasury |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 3,227,000 |  | 6,343,000 |
Level 2 | Commercial |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 4,755,000 |  | 4,816,000 |
Level 2 | Residential |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 17,387,000 |  | 12,042,000 |
Level 2 | Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 1,000 |  | 1,000 |
Level 2 | Residential Mortgage Loans |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Residential mortgage loan servicing rights | 0 |  |  |
Level 3 |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Equity securities | 0 |  | 0 |
Real estate loans held for sale | 0 |  | 0 |
Other assets | 4,000 |  | 3,000 |
Total assets | 544,000 |  | 3,000 |
Other liabilities | 0 |  | 0 |
Total liabilities | 0 |  | 0 |
Level 3 | U.S. Treasury |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Level 3 | Commercial |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Level 3 | Residential |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | 0 |
Level 3 | Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Investment securities available for sale: | 0 |  | $ 0 |
Level 3 | Residential Mortgage Loans |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Residential mortgage loan servicing rights | $ 540,000 |  |  |

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