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Fair value measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value measurements on a recurring basis |  |
Available-for-sale investment securities | $ 1,091,889 | $ 1,136,439
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 14 | 18
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 | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 14 | 18
Fair value measurements on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Interest rate swap (Other segment) | 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 | 1,815 | 1,058
Derivative liabilities |  |
Derivative liabilities | 0 | 303
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 | 1,077,672 | 1,122,081
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Bank | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 136 | 86
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Bank | Forward commitments |  |
Derivative assets |  |
Derivative assets | 1 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Significant other observable inputs (Level 2) | Interest rate swap (Other segment) | Interest rate swap |  |
Derivative assets |  |
Derivative assets | 1,678 | 972
Derivative liabilities |  |
Derivative liabilities | 0 | 303
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 | 1,035,134 | 1,077,168
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 | 9,637 | 12,010
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 | 32,901 | 32,903
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 | 14,217 | 14,358
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) | Interest rate swap (Other segment) | 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 | $ 14,217 | $ 14,358

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