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Bank segment - Contractual maturities of securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Due in one year or less | $ 60,299 |
Due after one year through five years | 70,894 |
Due after five years through ten years | 49,085 |
Due after ten years | 15,427 |
Total amortized cost | 195,705 |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 1,114,580 |
Amortized cost | 1,310,285 | $ 1,229,438
Held-to-Maturity, Debt Securities, Amortized Cost [Abstract] |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 134,656 |
Amortized cost | 134,656 | 139,451
Available-for-sale Securities, Debt Securities, Fair Value [Abstract] |  |
Due in one year or less | 60,622 |
Due after one year through five years | 73,071 |
Due after five years through ten years | 49,669 |
Due after ten years | 15,427 |
Total fair value | 198,789 |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 1,141,452 |
Total available-for-sale securities | 1,340,241 | 1,232,826
Held-to-maturity Securities, Debt Securities, Fair Value [Abstract] |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 142,570 |
Total held-to-maturity securities | $ 142,570 | $ 143,467

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