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Bank segment - Balance Sheets Data (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Cash and cash equivalents | $ 550,408 |  | $ 679,546 | $ 314,284 |  |
Investment securities |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 1,061,687 |  | 1,136,439 |  |  |
Held-to-maturity, at amortized cost (fair value of $1,058,691 and $1,103,668, at June 30, 2024 and December 31, 2023, respectively) | 1,179,182 |  | 1,201,314 |  |  |
Held-to-maturity investment securities | 1,058,691 |  |  |  |  |
Stock in Federal Home Loan Bank, at cost | 29,204 |  | 14,728 |  |  |
Allowance for credit losses | (66,813) | $ (71,057) | (74,372) | (69,068) | $ (71,296) | $ (72,216)
Loans held for investment, net | 5,963,345 |  | 6,106,438 |  |  |
Loans held for sale, at lower of cost or fair value | 13,904 |  | 15,168 |  |  |
Other | 1,057,165 |  | 877,959 |  |  |
Goodwill | 0 |  | 82,190 |  |  |
Total assets | 17,055,414 |  | 17,243,821 |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |
Other | 749,621 |  | 778,349 |  |  |
Total liabilities | 15,935,848 |  | 14,864,687 |  |  |
Retained earnings (deficit) | (326,642) |  | 926,720 |  |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax benefits | (297,557) |  | (289,350) |  |  |
Common stock equity | 1,085,273 | $ 2,377,380 | 2,344,841 | $ 2,249,377 | $ 2,237,955 | $ 2,202,499
Total liabilities and shareholders’ equity | 17,055,414 |  | 17,243,821 |  |  |
Other assets |  |  |  |  |  |
Premises and equipment, net | 6,298,721 |  | 6,150,126 |  |  |
Total other assets | 1,057,165 |  | 877,959 |  |  |
Other liabilities |  |  |  |  |  |
Total other liabilities | 749,621 |  | 778,349 |  |  |
American Savings Bank (ASB) |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and due from banks | 139,114 |  | 184,383 |  |  |
Interest-bearing deposits | 195,721 |  | 251,072 |  |  |
Cash and cash equivalents | 334,835 |  | 435,455 |  |  |
Investment securities |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 1,061,687 |  | 1,136,439 |  |  |
Held-to-maturity, at amortized cost (fair value of $1,058,691 and $1,103,668, at June 30, 2024 and December 31, 2023, respectively) | 1,179,182 |  | 1,201,314 |  |  |
Held-to-maturity investment securities | 1,058,691 |  | 1,103,668 |  |  |
Stock in Federal Home Loan Bank, at cost | 29,204 |  | 14,728 |  |  |
Loans held for investment | 6,030,158 |  | 6,180,810 |  |  |
Allowance for credit losses | (66,813) |  | (74,372) |  |  |
Loans held for investment, net | 5,963,345 |  | 6,106,438 |  |  |
Loans held for sale, at lower of cost or fair value | 13,904 |  | 15,168 |  |  |
Other | 698,648 |  | 681,460 |  |  |
Goodwill | 0 |  | 82,190 |  |  |
Total assets | 9,280,805 |  | 9,673,192 |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |
Deposit liabilities—noninterest-bearing | 2,515,062 |  | 2,599,762 |  |  |
Deposit liabilities—interest-bearing | 5,521,411 |  | 5,546,016 |  |  |
Other borrowings | 520,000 |  | 750,000 |  |  |
Other | 226,488 |  | 247,563 |  |  |
Total liabilities | 8,782,961 |  | 9,143,341 |  |  |
Common stock | 1 |  | 1 |  |  |
Additional paid-in capital | 359,048 |  | 358,067 |  |  |
Retained earnings (deficit) | 439,202 |  | 464,055 |  |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |  |  |
Net unrealized losses on securities | (291,864) |  | (282,963) |  |  |
Retirement benefit plans | (8,543) |  | (9,309) |  |  |
Accumulated other comprehensive loss, net of tax benefits | (300,407) |  | (292,272) |  |  |
Common stock equity | 497,844 |  | 529,851 |  |  |
Total liabilities and shareholders’ equity | 9,280,805 |  | 9,673,192 |  |  |
Other assets |  |  |  |  |  |
Bank-owned life insurance | 197,714 |  | 187,857 |  |  |
Premises and equipment, net | 181,855 |  | 187,042 |  |  |
Accrued interest receivable | 29,003 |  | 28,472 |  |  |
Mortgage-servicing rights | 7,906 |  | 8,169 |  |  |
Low-income housing investments | 104,394 |  | 112,234 |  |  |
Deferred tax asset | 122,927 |  | 104,292 |  |  |
Other | 54,849 |  | 53,394 |  |  |
Total other assets | 698,648 |  | 681,460 |  |  |
Other liabilities |  |  |  |  |  |
Accrued expenses | 110,173 |  | 115,231 |  |  |
Cashier’s checks | 37,372 |  | 40,479 |  |  |
Advance payments by borrowers | 11,477 |  | 10,107 |  |  |
Other | 67,466 |  | 81,746 |  |  |
Total other liabilities | $ 226,488 |  | $ 247,563 |  |  |

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