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Bank segment - Components of investment securities (Details) $ in Thousands | Jun. 30, 2020 USD ($) issue | Dec. 31, 2019 USD ($) issue
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 1,360,585 | $ 1,229,438
Gross unrealized gains | 29,328 | 8,015
Gross unrealized losses | (280) | (4,627)
Estimated fair value | $ 1,389,633 | $ 1,232,826
Gross unrealized losses, Less than 12 months, Number of issues | issue | 6 | 21
Gross unrealized losses, Less than 12 months, Fair value | $ 96,296 | $ 156,181
Gross unrealized losses, Less than 12 months, Amount | $ (258) | $ (830)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 1 | 78
Gross unrealized losses, 12 months or longer, Fair value | $ 1,803 | $ 345,657
Gross unrealized losses, 12 months or longer, Amount | (22) | (3,797)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 124,623 | 139,451
Gross unrealized gains | 6,508 | 4,087
Gross unrealized losses | 0 | (71)
Held-to-maturity investment securities | $ 131,131 | $ 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 | 100,195 | 117,255
Gross unrealized gains | 2,219 | 652
Gross unrealized losses | 0 | (120)
Estimated fair value | $ 102,414 | $ 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 | 1,201,796 | 1,024,892
Gross unrealized gains | 25,469 | 6,000
Gross unrealized losses | (280) | (4,507)
Estimated fair value | $ 1,226,985 | $ 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 | $ 96,296 | $ 152,071
Gross unrealized losses, Less than 12 months, Amount | $ (258) | $ (819)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 1 | 75
Gross unrealized losses, 12 months or longer, Fair value | $ 1,803 | $ 318,020
Gross unrealized losses, 12 months or longer, Amount | (22) | (3,688)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 124,623 | 139,451
Gross unrealized gains | 6,508 | 4,087
Gross unrealized losses | 0 | (71)
Held-to-maturity investment securities | $ 131,131 | $ 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 | 29,767 | 58,694
Gross unrealized gains | 1,640 | 1,363
Gross unrealized losses | 0 | 0
Estimated fair value | $ 31,407 | $ 60,057
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
Mortgage revenue bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | 28,827 | 28,597
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 28,827 | $ 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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