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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | $ 1,419,755 | $ 1,429,667
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Derivative assets |  |
Derivative assets | 9 | 18
Derivative liabilities |  |
Derivative liabilities | 4 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Bank | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Bank | Forward commitments |  |
Derivative assets |  |
Derivative assets | 9 | 18
Derivative liabilities |  |
Derivative liabilities | 4 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Other | Interest rate swap |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | U.S. Treasury and federal agency obligations | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate bonds | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Mortgage revenue bonds | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) |  |
Derivative assets |  |
Derivative assets | 1,133 | 1,330
Derivative liabilities |  |
Derivative liabilities | 0 | 472
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 1,404,989 | 1,414,765
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Bank | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 26 | 9
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Bank | Forward commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Other | Interest rate swap |  |
Derivative assets |  |
Derivative assets | 1,107 | 1,321
Derivative liabilities |  |
Derivative liabilities | 0 | 472
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 1,283,935 | 1,292,968
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | U.S. Treasury and federal agency obligations | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 79,744 | 81,063
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Corporate bonds | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 41,310 | 40,734
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Mortgage revenue bonds | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 14,766 | 14,902
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Bank | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Bank | Forward commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Other | Interest rate swap |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | U.S. Treasury and federal agency obligations | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Corporate bonds | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Mortgage revenue bonds | Bank |  |
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | $ 14,766 | $ 14,902

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