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Bank segment - Components of Investment Securities (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
issue
Dec. 31, 2023
USD ($)
issue
Available-for-sale    
Amortized cost $ 1,315,900  
Available-for-sale investment securities, at fair value 1,091,889 $ 1,136,439
Held-to-maturity    
Held-to-maturity investment securities, at amortized cost 1,191,074 1,201,314
Held-to-maturity investment securities 1,074,735  
American Savings Bank (ASB)    
Available-for-sale    
Amortized cost 1,315,900 1,341,886
Gross unrealized gains 0 0
Gross unrealized losses (224,011) (205,447)
Available-for-sale investment securities, at fair value $ 1,091,889 $ 1,136,439
Gross unrealized losses, less than 12 months, number of issues | issue 2 3
Gross unrealized losses, less than 12 months, fair value $ 1,340 $ 1,649
Gross unrealized losses, less than 12 months, amount $ (17) $ (22)
Gross unrealized losses, 12 months or longer, number of issues | issue 126 128
Gross unrealized losses, 12 months or longer, fair value $ 1,076,332 $ 1,120,432
Gross unrealized losses, 12 months or more, amount (223,994) (205,425)
Held-to-maturity    
Held-to-maturity investment securities, at amortized cost 1,191,074 1,201,314
Gross unrealized gains 85 2,221
Gross unrealized losses (116,424) (99,867)
Held-to-maturity investment securities $ 1,074,735 $ 1,103,668
Less than 12 months, number of issues | issue 55 37
Less than 12 months, fair value $ 549,389 $ 378,326
Less than 12 months, amount $ (18,604) $ (7,610)
12 months or longer, number of issues | issue 48 46
12 months or longer: fair value $ 500,823 $ 484,864
12 months or longer, amount (97,820) (92,257)
U.S. Treasury and federal agency obligations | American Savings Bank (ASB)    
Available-for-sale    
Amortized cost 10,052 12,437
Gross unrealized gains 0 0
Gross unrealized losses (415) (427)
Available-for-sale investment securities, at fair value $ 9,637 $ 12,010
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 8 9
Gross unrealized losses, 12 months or longer, fair value $ 9,637 $ 12,010
Gross unrealized losses, 12 months or more, amount (415) (427)
Held-to-maturity    
Held-to-maturity investment securities, at amortized cost 59,923 59,917
Gross unrealized gains 0 0
Gross unrealized losses (7,830) (7,135)
Held-to-maturity investment securities $ 52,093 $ 52,782
Less than 12 months, number of issues | issue 0 0
Less than 12 months, fair value $ 0 $ 0
Less than 12 months, amount $ 0 $ 0
12 months or longer, number of issues | issue 3 3
12 months or longer: fair value $ 52,094 $ 52,782
12 months or longer, amount (7,830) (7,135)
Mortgage-backed securities | American Savings Bank (ASB)    
Available-for-sale    
Amortized cost 1,256,426 1,279,852
Gross unrealized gains 0 0
Gross unrealized losses (221,292) (202,684)
Available-for-sale investment securities, at fair value $ 1,035,134 $ 1,077,168
Gross unrealized losses, less than 12 months, number of issues | issue 2 3
Gross unrealized losses, less than 12 months, fair value $ 1,340 $ 1,649
Gross unrealized losses, less than 12 months, amount $ (17) $ (22)
Gross unrealized losses, 12 months or longer, number of issues | issue 115 116
Gross unrealized losses, 12 months or longer, fair value $ 1,033,794 $ 1,075,519
Gross unrealized losses, 12 months or more, amount (221,275) (202,662)
Held-to-maturity    
Held-to-maturity investment securities, at amortized cost 1,131,151 1,141,397
Gross unrealized gains 85 2,221
Gross unrealized losses (108,594) (92,732)
Held-to-maturity investment securities $ 1,022,642 $ 1,050,886
Less than 12 months, number of issues | issue 55 37
Less than 12 months, fair value $ 549,389 $ 378,326
Less than 12 months, amount $ (18,604) $ (7,610)
12 months or longer, number of issues | issue 45 43
12 months or longer: fair value $ 448,729 $ 432,082
12 months or longer, amount (89,990) (85,122)
Corporate bonds | American Savings Bank (ASB)    
Available-for-sale    
Amortized cost 35,205 35,239
Gross unrealized gains 0 0
Gross unrealized losses (2,304) (2,336)
Available-for-sale investment securities, at fair value $ 32,901 $ 32,903
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 3 3
Gross unrealized losses, 12 months or longer, fair value $ 32,901 $ 32,903
Gross unrealized losses, 12 months or more, amount (2,304) (2,336)
Mortgage revenue bonds | American Savings Bank (ASB)    
Available-for-sale    
Amortized cost 14,217 14,358
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Available-for-sale investment securities, at fair value $ 14,217 $ 14,358
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