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Bank segment - Components of investment securities (Details) $ in Thousands | Jun. 30, 2018 USD ($) issue | Dec. 31, 2017 USD ($) issue
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 1,454,057 | $ 1,421,622
Gross unrealized gains | 445 | 1,231
Gross unrealized losses | (44,974) | (21,655)
Estimated fair value | $ 1,409,528 | $ 1,401,198
Gross unrealized losses, Less than 12 months, Number of issues | issue | 104 | 82
Gross unrealized losses, Less than 12 months, Fair value | $ 817,048 | $ 736,772
Gross unrealized losses, Less than 12 months, Amount | $ (21,381) | $ (7,664)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 92 | 85
Gross unrealized losses, 12 months or longer, Fair value | $ 523,501 | $ 522,208
Gross unrealized losses, 12 months or longer, Amount | (23,593) | (13,991)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 62,630 | 44,515
Gross unrealized gains | 41 | 1
Gross unrealized losses | (1,227) | (104)
Held-to-maturity investment securities | $ 61,444 | $ 44,412
Less Than 12 Months: Number Of Issues | issue | 3 | 2
Less than 12 Months: Fair value | $ 41,138 | $ 35,744
Less than 12 Months: Amount | $ (1,227) | $ (104)
12 months or longer: Number of issues | issue | 0 | 0
12 months or longer: Fair value | $ 0 | $ 0
12 months or longer: Amount | 0 | 0
U.S. Treasury and federal agency obligations |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 179,986 | 185,891
Gross unrealized gains | 72 | 438
Gross unrealized losses | (4,125) | (2,031)
Estimated fair value | $ 175,933 | $ 184,298
Gross unrealized losses, Less than 12 months, Number of issues | issue | 19 | 15
Gross unrealized losses, Less than 12 months, Fair value | $ 98,578 | $ 83,137
Gross unrealized losses, Less than 12 months, Amount | $ (2,018) | $ (825)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 9 | 8
Gross unrealized losses, 12 months or longer, Fair value | $ 67,283 | $ 62,296
Gross unrealized losses, 12 months or longer, Amount | (2,107) | (1,206)
Mortgage-related securities- FNMA, FHLMC and GNMA |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 1,218,313 | 1,220,304
Gross unrealized gains | 350 | 793
Gross unrealized losses | (40,831) | (19,624)
Estimated fair value | $ 1,177,832 | $ 1,201,473
Gross unrealized losses, Less than 12 months, Number of issues | issue | 81 | 67
Gross unrealized losses, Less than 12 months, Fair value | $ 694,629 | $ 653,635
Gross unrealized losses, Less than 12 months, Amount | $ (19,345) | $ (6,839)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 83 | 77
Gross unrealized losses, 12 months or longer, Fair value | $ 456,218 | $ 459,912
Gross unrealized losses, 12 months or longer, Amount | (21,486) | (12,785)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 62,630 | 44,515
Gross unrealized gains | 41 | 1
Gross unrealized losses | (1,227) | (104)
Held-to-maturity investment securities | $ 61,444 | $ 44,412
Less Than 12 Months: Number Of Issues | issue | 3 | 2
Less than 12 Months: Fair value | $ 41,138 | $ 35,744
Less than 12 Months: Amount | $ (1,227) | $ (104)
12 months or longer: Number of issues | issue | 0 | 0
12 months or longer: Fair value | $ 0 | $ 0
12 months or longer: Amount | 0 | 0
Corporate bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 40,331 |
Gross unrealized gains | 23 |
Gross unrealized losses | (18) |
Estimated fair value | $ 40,336 |
Gross unrealized losses, Less than 12 months, Number of issues | issue | 4 |
Gross unrealized losses, Less than 12 months, Fair value | $ 23,841 |
Gross unrealized losses, Less than 12 months, Amount | $ (18) |
Gross unrealized losses, 12 months or longer, Number of issues | issue | 0 |
Gross unrealized losses, 12 months or longer, Fair value | $ 0 |
Gross unrealized losses, 12 months or longer, Amount | 0 |
Mortgage revenue bond |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 15,427 | 15,427
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 15,427 | $ 15,427
Gross unrealized losses, Less than 12 months, Number of issues | issue | 0 | 0
Gross unrealized losses, Less than 12 months, Fair value | $ 0 | $ 0
Gross unrealized losses, Less than 12 months, Amount | $ 0 | $ 0
Gross unrealized losses, 12 months or longer, Number of issues | issue | 0 | 0
Gross unrealized losses, 12 months or longer, Fair value | $ 0 | $ 0
Gross unrealized losses, 12 months or longer, Amount | $ 0 | $ 0

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