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Bank segment - Components of investment securities (Details) $ in Thousands | Sep. 30, 2021 USD ($) issue | Dec. 31, 2020 USD ($) issue
--- | --- | ---
Available-for-sale |  |
Available-for-sale investment securities, at fair value | $ 2,580,830 | $ 1,970,417
Held-to-maturity |  |
Amortized cost | 491,871 | 226,947
Held-to-maturity investment securities | 484,654 |
American Savings Bank (ASB) |  |
Available-for-sale |  |
Amortized cost | 2,608,592 | 1,943,114
Gross unrealized gains | 13,488 | 30,454
Gross unrealized losses | (41,250) | (3,151)
Available-for-sale investment securities, at fair value | $ 2,580,830 | $ 1,970,417
Gross unrealized losses, Less than 12 months, Number of issues | issue | 106 | 22
Gross unrealized losses, Less than 12 months, Fair value | $ 1,792,604 | $ 373,924
Gross unrealized losses, Less than 12 months, Amount | $ (36,651) | $ (3,151)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 9 | 0
Gross unrealized losses, 12 months or longer, Fair value | $ 123,882 | $ 0
Gross unrealized losses, 12 months or more, amount | (4,599) | 0
Held-to-maturity |  |
Amortized cost | 491,871 | 226,947
Gross unrealized gains | 2,487 | 3,846
Gross unrealized losses | (9,704) | (830)
Held-to-maturity investment securities | $ 484,654 | $ 229,963
Less than 12 months: Number of issues | issue | 24 | 7
Less than 12 Months: Fair value | $ 345,848 | $ 114,152
Less than 12 Months: Amount | $ (8,291) | $ (830)
12 months or longer: Number of issues | issue | 2 | 0
12 months or longer: Fair value | $ 23,860 | $ 0
12 months or longer: Amount | (1,413) | 0
U.S. Treasury and federal agency obligations | American Savings Bank (ASB) |  |
Available-for-sale |  |
Amortized cost | 90,831 | 60,260
Gross unrealized gains | 1,334 | 2,062
Gross unrealized losses | (90) | 0
Available-for-sale investment securities, at fair value | $ 92,075 | $ 62,322
Gross unrealized losses, Less than 12 months, Number of issues | issue | 1 | 0
Gross unrealized losses, Less than 12 months, Fair value | $ 19,851 | $ 0
Gross unrealized losses, Less than 12 months, Amount | $ (90) | $ 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 more, amount | 0 | 0
Held-to-maturity |  |
Amortized cost | 40,064 |
Gross unrealized gains | 100 |
Gross unrealized losses | (13) |
Held-to-maturity investment securities | $ 40,151 |
Less than 12 months: Number of issues | issue | 1 |
Less than 12 Months: Fair value | $ 19,941 |
Less than 12 Months: Amount | $ (13) |
12 months or longer: Number of issues | issue | 0 |
12 months or longer: Fair value | $ 0 |
12 months or longer: Amount | 0 |
Mortgage-backed securities | American Savings Bank (ASB) |  |
Available-for-sale |  |
Amortized cost | 2,471,650 | 1,825,893
Gross unrealized gains | 11,193 | 26,817
Gross unrealized losses | (41,160) | (3,151)
Available-for-sale investment securities, at fair value | $ 2,441,683 | $ 1,849,559
Gross unrealized losses, Less than 12 months, Number of issues | issue | 105 | 22
Gross unrealized losses, Less than 12 months, Fair value | $ 1,772,753 | $ 373,924
Gross unrealized losses, Less than 12 months, Amount | $ (36,561) | $ (3,151)
Gross unrealized losses, 12 months or longer, Number of issues | issue | 9 | 0
Gross unrealized losses, 12 months or longer, Fair value | $ 123,882 | $ 0
Gross unrealized losses, 12 months or more, amount | (4,599) | 0
Held-to-maturity |  |
Amortized cost | 451,807 | 226,947
Gross unrealized gains | 2,387 | 3,846
Gross unrealized losses | (9,691) | (830)
Held-to-maturity investment securities | $ 444,503 | $ 229,963
Less than 12 months: Number of issues | issue | 23 | 7
Less than 12 Months: Fair value | $ 325,907 | $ 114,152
Less than 12 Months: Amount | $ (8,278) | $ (830)
12 months or longer: Number of issues | issue | 2 | 0
12 months or longer: Fair value | $ 23,860 | $ 0
12 months or longer: Amount | (1,413) | 0
Corporate bonds | American Savings Bank (ASB) |  |
Available-for-sale |  |
Amortized cost | 30,684 | 29,776
Gross unrealized gains | 961 | 1,575
Gross unrealized losses | 0 | 0
Available-for-sale investment securities, at fair value | $ 31,645 | $ 31,351
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 more, amount | 0 | 0
Mortgage revenue bonds | American Savings Bank (ASB) |  |
Available-for-sale |  |
Amortized cost | 15,427 | 27,185
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Available-for-sale investment securities, at fair value | $ 15,427 | $ 27,185
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 more, amount | $ 0 | $ 0

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