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Bank segment - Balance Sheets Data (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 667,129 |  |  | $ 199,877 | $ 175,280 |  |  |
Investment securities |  |  |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 1,266,412 |  |  | 1,429,667 |  |  |  |
Held-to-maturity, at amortized cost (fair value of $1,052,221 and $1,150,971, respectively) | 1,212,005 |  |  | 1,251,747 |  |  |  |
Held-to-maturity investment securities | 1,052,221 |  |  |  |  |  |  |
Stock in Federal Home Loan Bank, at cost | 18,000 |  |  | 26,560 |  |  |  |
Allowance for credit losses | (76,366) | $ (69,068) |  | (72,216) | (70,406) | $ (69,456) |  | $ (71,130)
Loans held for investment, net | 6,114,640 |  |  | 5,906,690 |  |  |  |
Loans held for sale, at lower of cost or fair value | 2,171 |  |  | 824 |  |  |  |
Other assets | 826,020 |  |  | 824,536 |  |  |  |
Goodwill | 82,190 |  |  | 82,190 |  |  |  |
Total assets | 16,991,818 |  |  | 16,284,244 |  |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |  |  |
Other | 837,506 |  |  | 787,057 |  |  |  |
Total liabilities | 14,733,171 |  |  | 14,047,452 |  |  |  |
Retained earnings | 877,931 |  |  | 845,830 |  |  |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax benefits | (358,024) |  |  | (336,028) |  |  |  |
Common stock equity | 2,224,354 | $ 2,249,377 | $ 2,237,955 | 2,202,499 | $ 2,162,922 | $ 2,233,504 | $ 2,303,642 | $ 2,390,884
Total liabilities and shareholders’ equity | 16,991,818 |  |  | 16,284,244 |  |  |  |
Other assets |  |  |  |  |  |  |  |
Premises and equipment, net | 5,917,342 |  |  | 5,687,003 |  |  |  |
Other assets | 826,020 |  |  | 824,536 |  |  |  |
Other liabilities |  |  |  |  |  |  |  |
Other liabilities | 837,506 |  |  | 787,057 |  |  |  |
American Savings Bank (ASB) |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash and due from banks | 139,059 |  |  | 153,042 |  |  |  |
Interest-bearing deposits | 124,531 |  |  | 3,107 |  |  |  |
Cash and cash equivalents | 263,590 |  |  | 156,149 |  |  |  |
Investment securities |  |  |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 1,266,412 |  |  | 1,429,667 |  |  |  |
Held-to-maturity, at amortized cost (fair value of $1,052,221 and $1,150,971, respectively) | 1,212,005 |  |  | 1,251,747 |  |  |  |
Held-to-maturity investment securities | 1,052,221 |  |  | 1,150,971 |  |  |  |
Stock in Federal Home Loan Bank, at cost | 18,000 |  |  | 26,560 |  |  |  |
Loans held for investment | 6,191,006 |  |  | 5,978,906 |  |  |  |
Allowance for credit losses | (76,366) |  |  | (72,216) |  |  |  |
Loans held for investment, net | 6,114,640 |  |  | 5,906,690 |  |  |  |
Loans held for sale, at lower of cost or fair value | 2,171 |  |  | 824 |  |  |  |
Other assets | 698,420 |  |  | 692,143 |  |  |  |
Goodwill | 82,190 |  |  | 82,190 |  |  |  |
Total assets | 9,657,428 |  |  | 9,545,970 |  |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |  |  |
Deposit liabilities—noninterest-bearing | 2,573,010 |  |  | 2,811,077 |  |  |  |
Deposit liabilities—interest-bearing | 5,651,341 |  |  | 5,358,619 |  |  |  |
Other borrowings | 750,000 |  |  | 695,120 |  |  |  |
Other | 224,136 |  |  | 212,269 |  |  |  |
Total liabilities | 9,198,487 |  |  | 9,077,085 |  |  |  |
Common stock | 1 |  |  | 1 |  |  |  |
Additional paid-in capital | 357,742 |  |  | 355,806 |  |  |  |
Retained earnings | 460,824 |  |  | 449,693 |  |  |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |  |  |  |  |
Net unrealized losses on securities | (350,234) |  |  | (328,904) |  |  |  |
Retirement benefit plans | (9,392) |  |  | (7,711) |  |  |  |
Accumulated other comprehensive loss, net of tax benefits | (359,626) |  |  | (336,615) |  |  |  |
Common stock equity | 458,941 |  |  | 468,885 |  |  |  |
Total liabilities and shareholders’ equity | 9,657,428 |  |  | 9,545,970 |  |  |  |
Other assets |  |  |  |  |  |  |  |
Bank-owned life insurance | 186,143 |  |  | 182,986 |  |  |  |
Premises and equipment, net | 189,950 |  |  | 195,324 |  |  |  |
Accrued interest receivable | 29,361 |  |  | 25,077 |  |  |  |
Mortgage-servicing rights | 8,376 |  |  | 9,047 |  |  |  |
Low-income housing investments | 103,580 |  |  | 106,978 |  |  |  |
Deferred tax asset | 127,735 |  |  | 116,441 |  |  |  |
Real estate acquired in settlement of loans, net | 0 |  |  | 115 |  |  |  |
Other | 53,275 |  |  | 56,175 |  |  |  |
Other assets | 698,420 |  |  | 692,143 |  |  |  |
Other liabilities |  |  |  |  |  |  |  |
Accrued expenses | 102,540 |  |  | 97,295 |  |  |  |
Federal and state income taxes payable | 845 |  |  | 863 |  |  |  |
Cashier’s checks | 38,483 |  |  | 36,401 |  |  |  |
Advance payments by borrowers | 4,289 |  |  | 9,637 |  |  |  |
Other | 77,979 |  |  | 68,073 |  |  |  |
Other liabilities | $ 224,136 |  |  | $ 212,269 |  |  |  |

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