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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | $ 2,621,375 | $ 2,574,618
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Derivative liabilities |  |
Derivative liabilities | 0 | 11
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
Derivative assets |  |
Derivative assets | 168 | 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
Derivative liabilities |  |
Derivative liabilities | 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 | 168 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 11
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 liabilities |  |
Derivative liabilities | 1,704 | 5,271
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 | 2,606,079 | 2,559,191
Derivative assets |  |
Derivative assets | 824 | 909
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Bank | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 40 | 638
Derivative liabilities |  |
Derivative liabilities | 58 | 0
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 | 784 | 271
Derivative liabilities |  |
Derivative liabilities | 1,646 | 5,271
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 | 2,456,754 | 2,437,923
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 | 106,202 | 90,090
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 | 43,123 | 31,178
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 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 | 15,296 | 15,427
Derivative assets |  |
Derivative assets | 0 | 0
Fair value measurements on a recurring basis | Significant unobservable inputs (Level 3) | Bank | Interest rate lock 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) | 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 | $ 15,296 | $ 15,427

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