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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative assets |  |
Available-for-sale investment securities | $ 1,409,528 | $ 1,401,198
Corporate bonds |  |
Derivative assets |  |
Available-for-sale investment securities | 40,336 |
Mortgage revenue bond |  |
Derivative assets |  |
Available-for-sale investment securities | 15,427 | 15,427
Fair value measurements on a recurring basis | Level 1 |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 56 | 20
Fair value measurements on a recurring basis | Level 1 | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Forward commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 56 | 20
Fair value measurements on a recurring basis | Level 1 | Window forward contracts |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Mortgage-related securities - FNMA, FHLMC and GNMA | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 1 | U.S. Treasury federal agency obligations | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Corporate bonds | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 1 | Mortgage revenue bond | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 2 |  |
Derivative assets |  |
Derivative assets | 250 | 393
Derivative liabilities |  |
Derivative liabilities | 114 | 10
Fair value measurements on a recurring basis | Level 2 | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 248 | 133
Derivative liabilities |  |
Derivative liabilities | 0 | 2
Fair value measurements on a recurring basis | Level 2 | Forward commitments |  |
Derivative assets |  |
Derivative assets | 2 | 4
Derivative liabilities |  |
Derivative liabilities | 8 | 8
Fair value measurements on a recurring basis | Level 2 | Window forward contracts |  |
Derivative assets |  |
Derivative assets | 0 | 256
Derivative liabilities |  |
Derivative liabilities | 106 | 0
Fair value measurements on a recurring basis | Level 2 | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 1,394,101 | 1,385,771
Fair value measurements on a recurring basis | Level 2 | Mortgage-related securities - FNMA, FHLMC and GNMA | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 1,177,832 | 1,201,473
Fair value measurements on a recurring basis | Level 2 | U.S. Treasury federal agency obligations | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 175,933 | 184,298
Fair value measurements on a recurring basis | Level 2 | Corporate bonds | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 40,336 | 0
Fair value measurements on a recurring basis | Level 2 | Mortgage revenue bond | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 3 |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Interest rate lock commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Forward commitments |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Window forward contracts |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 15,427 | 15,427
Fair value measurements on a recurring basis | Level 3 | Mortgage-related securities - FNMA, FHLMC and GNMA | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | U.S. Treasury federal agency obligations | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Corporate bonds | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | 0 | 0
Fair value measurements on a recurring basis | Level 3 | Mortgage revenue bond | Bank |  |
Derivative assets |  |
Available-for-sale investment securities | $ 15,427 | $ 15,427

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