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Bank segment - Components of investment securities (Details) $ in Thousands | Mar. 31, 2020 USD ($) issue | Dec. 31, 2019 USD ($) issue
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 1,310,285 | $ 1,229,438
Gross unrealized gains | 30,724 | 8,015
Gross unrealized losses | (768) | (4,627)
Estimated fair value | $ 1,340,241 | $ 1,232,826
Gross unrealized losses, Less than 12 months, Number of issues | issue | 7 | 21
Gross unrealized losses, Less than 12 months, Fair value | $ 43,690 | $ 156,181
Gross unrealized losses, Less than 12 months, Amount | $ (276) | $ (830)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 15 | 78
Gross unrealized losses, 12 months or longer, Fair value | $ 40,892 | $ 345,657
Gross unrealized losses, 12 months or longer, Amount | (492) | (3,797)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 134,656 | 139,451
Gross unrealized gains | 7,914 | 4,087
Gross unrealized losses | 0 | (71)
Held-to-maturity investment securities | $ 142,570 | $ 143,467
Less Than 12 Months: Number Of Issues | issue | 0 | 1
Less than 12 Months: Fair value | $ 0 | $ 12,986
Less than 12 Months: Amount | $ 0 | $ (71)
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 | 108,298 | 117,255
Gross unrealized gains | 1,995 | 652
Gross unrealized losses | 0 | (120)
Estimated fair value | $ 110,293 | $ 117,787
Gross unrealized losses, Less than 12 months, Number of issues | issue | 0 | 2
Gross unrealized losses, Less than 12 months, Fair value | $ 0 | $ 4,110
Gross unrealized losses, Less than 12 months, Amount | $ 0 | $ (11)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 0 | 3
Gross unrealized losses, 12 months or longer, Fair value | $ 0 | $ 27,637
Gross unrealized losses, 12 months or longer, Amount | 0 | (109)
Mortgage-backed securities* |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 1,114,580 | 1,024,892
Gross unrealized gains | 27,493 | 6,000
Gross unrealized losses | (621) | (4,507)
Estimated fair value | $ 1,141,452 | $ 1,026,385
Gross unrealized losses, Less than 12 months, Number of issues | issue | 6 | 19
Gross unrealized losses, Less than 12 months, Fair value | $ 28,937 | $ 152,071
Gross unrealized losses, Less than 12 months, Amount | $ (129) | $ (819)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 15 | 75
Gross unrealized losses, 12 months or longer, Fair value | $ 40,892 | $ 318,020
Gross unrealized losses, 12 months or longer, Amount | (492) | (3,688)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 134,656 | 139,451
Gross unrealized gains | 7,914 | 4,087
Gross unrealized losses | 0 | (71)
Held-to-maturity investment securities | $ 142,570 | $ 143,467
Less Than 12 Months: Number Of Issues | issue | 0 | 1
Less than 12 Months: Fair value | $ 0 | $ 12,986
Less than 12 Months: Amount | $ 0 | $ (71)
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 | 58,681 | 58,694
Gross unrealized gains | 1,236 | 1,363
Gross unrealized losses | (147) | 0
Estimated fair value | $ 59,770 | $ 60,057
Gross unrealized losses, Less than 12 months, Number of issues | issue | 1 | 0
Gross unrealized losses, Less than 12 months, Fair value | $ 14,753 | $ 0
Gross unrealized losses, Less than 12 months, Amount | $ (147) | $ 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
Mortgage revenue bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 28,726 | 28,597
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 28,726 | $ 28,597
Gross unrealized losses, Less than 12 months, Number of issues | issue | 0 | 0
Gross unrealized losses, Less than 12 months, Fair value |  | $ 0
Gross unrealized losses, Less than 12 months, Amount |  | $ 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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