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Bank segment - Components of investment securities (Details) $ in Thousands | Sep. 30, 2018 USD ($) issue | Dec. 31, 2017 USD ($) issue
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 1,439,098 | $ 1,421,622
Gross unrealized gains | 362 | 1,231
Gross unrealized losses | (51,889) | (21,655)
Estimated fair value | $ 1,387,571 | $ 1,401,198
Gross unrealized losses, Less than 12 months, Number of issues | issue | 75 | 82
Gross unrealized losses, Less than 12 months, Fair value | $ 563,811 | $ 736,772
Gross unrealized losses, Less than 12 months, Amount | $ (15,376) | $ (7,664)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 128 | 85
Gross unrealized losses, 12 months or longer, Fair value | $ 759,281 | $ 522,208
Gross unrealized losses, 12 months or longer, Amount | (36,513) | (13,991)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 102,498 | 44,515
Gross unrealized gains | 0 | 1
Gross unrealized losses | (2,569) | (104)
Held-to-maturity investment securities | $ 99,929 | $ 44,412
Less Than 12 Months: Number Of Issues | issue | 7 | 2
Less than 12 Months: Fair value | $ 99,929 | $ 35,744
Less than 12 Months: Amount | $ (2,569) | $ (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 | 175,144 | 185,891
Gross unrealized gains | 24 | 438
Gross unrealized losses | (4,754) | (2,031)
Estimated fair value | $ 170,414 | $ 184,298
Gross unrealized losses, Less than 12 months, Number of issues | issue | 11 | 15
Gross unrealized losses, Less than 12 months, Fair value | $ 67,258 | $ 83,137
Gross unrealized losses, Less than 12 months, Amount | $ (1,339) | $ (825)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 17 | 8
Gross unrealized losses, 12 months or longer, Fair value | $ 93,132 | $ 62,296
Gross unrealized losses, 12 months or longer, Amount | (3,415) | (1,206)
Mortgage-related securities- FNMA, FHLMC and GNMA |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 1,195,492 | 1,220,304
Gross unrealized gains | 292 | 793
Gross unrealized losses | (47,094) | (19,624)
Estimated fair value | $ 1,148,690 | $ 1,201,473
Gross unrealized losses, Less than 12 months, Number of issues | issue | 59 | 67
Gross unrealized losses, Less than 12 months, Fair value | $ 473,714 | $ 653,635
Gross unrealized losses, Less than 12 months, Amount | $ (13,996) | $ (6,839)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 111 | 77
Gross unrealized losses, 12 months or longer, Fair value | $ 666,149 | $ 459,912
Gross unrealized losses, 12 months or longer, Amount | (33,098) | (12,785)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 102,498 | 44,515
Gross unrealized gains | 0 | 1
Gross unrealized losses | (2,569) | (104)
Held-to-maturity investment securities | $ 99,929 | $ 44,412
Less Than 12 Months: Number Of Issues | issue | 7 | 2
Less than 12 Months: Fair value | $ 99,929 | $ 35,744
Less than 12 Months: Amount | $ (2,569) | $ (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 | 49,378 |
Gross unrealized gains | 46 |
Gross unrealized losses | (41) |
Estimated fair value | $ 49,383 |
Gross unrealized losses, Less than 12 months, Number of issues | issue | 5 |
Gross unrealized losses, Less than 12 months, Fair value | $ 22,839 |
Gross unrealized losses, Less than 12 months, Amount | $ (41) |
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 bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 19,084 | 15,427
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 19,084 | $ 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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