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Bank segment - Contractual maturities of securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Due in one year or less | $ 25,005 |
Due after one year through five years | 105,425 |
Due after five years through ten years | 77,526 |
Due after ten years | 27,788 |
Total amortized cost | 235,744 |
Mortgage-related securities-FNMA, FHLMC and GNMA | 1,218,313 |
Amortized cost | 1,454,057 | $ 1,421,622
Held-to-Maturity, Debt Securities, Amortized Cost [Abstract] |  |
Mortgage-related securities-FNMA, FHLMC and GNMA | 62,630 |
Amortized cost | 62,630 | 44,515
Available-for-sale Securities, Debt Securities, Fair Value [Abstract] |  |
Due in one year or less | 24,860 |
Due after one year through five years | 104,020 |
Due after five years through ten years | 75,563 |
Due after ten years | 27,253 |
Total fair value | 231,696 |
Mortgage-related securities-FNMA, FHLMC and GNMA | 1,177,832 |
Total available-for-sale securities | 1,409,528 | 1,401,198
Held-to-maturity Securities, Debt Securities, Fair Value [Abstract] |  |
Mortgage-related securities-FNMA, FHLMC and GNMA | 61,444 |
Total held-to-maturity securities | $ 61,444 | $ 44,412

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