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Bank segment - Components of investment securities (Details) $ in Thousands | Sep. 30, 2020 USD ($) issues | Dec. 31, 2019 USD ($) issues
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized cost | $ 1,717,265 | $ 1,229,438
Gross unrealized gains | 31,374 | 8,015
Gross unrealized losses | (981) | (4,627)
Estimated fair value | $ 1,747,658 | $ 1,232,826
Gross unrealized losses, Less than 12 months, Number of issues | issues | 17 | 21
Gross unrealized losses, Less than 12 months, Fair value | $ 304,930 | $ 156,181
Gross unrealized losses, Less than 12 months, Amount | $ (981) | $ (830)
Gross unrealized losses, 12 months or longer, Number of issues | issues | 0 | 78
Gross unrealized losses, 12 months or longer, Fair value | $ 0 | $ 345,657
Gross unrealized losses, 12 months or longer, Amount | 0 | (3,797)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 133,858 | 139,451
Gross unrealized gains | 4,878 | 4,087
Gross unrealized losses | (114) | (71)
Held-to-maturity investment securities | $ 138,622 | $ 143,467
Less Than 12 Months: Number Of Issues | issues | 2 | 1
Less than 12 Months: Fair value | $ 28,486 | $ 12,986
Less than 12 Months: Amount | $ (114) | $ (71)
12 months or longer: Number of issues | issues | 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 | 61,359 | 117,255
Gross unrealized gains | 2,229 | 652
Gross unrealized losses | 0 | (120)
Estimated fair value | $ 63,588 | $ 117,787
Gross unrealized losses, Less than 12 months, Number of issues | issues | 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 | issues | 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 | 1,598,949 | 1,024,892
Gross unrealized gains | 27,580 | 6,000
Gross unrealized losses | (981) | (4,507)
Estimated fair value | $ 1,625,548 | $ 1,026,385
Gross unrealized losses, Less than 12 months, Number of issues | issues | 17 | 19
Gross unrealized losses, Less than 12 months, Fair value | $ 304,930 | $ 152,071
Gross unrealized losses, Less than 12 months, Amount | $ (981) | $ (819)
Gross unrealized losses, 12 months or longer, Number of issues | issues | 0 | 75
Gross unrealized losses, 12 months or longer, Fair value | $ 0 | $ 318,020
Gross unrealized losses, 12 months or longer, Amount | 0 | (3,688)
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized cost | 133,858 | 139,451
Gross unrealized gains | 4,878 | 4,087
Gross unrealized losses | (114) | (71)
Held-to-maturity investment securities | $ 138,622 | $ 143,467
Less Than 12 Months: Number Of Issues | issues | 2 | 1
Less than 12 Months: Fair value | $ 28,486 | $ 12,986
Less than 12 Months: Amount | $ (114) | $ (71)
12 months or longer: Number of issues | issues | 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 | 29,772 | 58,694
Gross unrealized gains | 1,565 | 1,363
Gross unrealized losses | 0 | 0
Estimated fair value | $ 31,337 | $ 60,057
Gross unrealized losses, Less than 12 months, Number of issues | issues | 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 | issues | 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 | 27,185 | 28,597
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 27,185 | $ 28,597
Gross unrealized losses, Less than 12 months, Number of issues | issues | 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 | issues | 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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