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Bank segment - Balance sheet data (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Cash and cash equivalents | $ 159,672 |  | $ 305,551 | $ 247,443 |  |
Investment securities |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 2,444,267 |  | 2,574,618 |  |  |
Held-to-maturity, at amortized cost (fair value of $440,023 and $510,474, respectively) | 513,767 |  | 522,270 |  |  |
Held-to-maturity investment securities | 440,023 |  |  |  |  |
Stock in Federal Home Loan Bank, at cost | 13,200 |  | 10,000 |  |  |
Allowance for credit losses | (69,456) | $ (67,211) | (71,130) | (78,252) | $ (91,793) | $ (101,201)
Total loans, net | 5,357,539 |  | 5,139,984 |  |  |
Loans held for sale, at lower of cost or fair value | 3,738 |  | 10,404 |  |  |
Other assets | 883,594 |  | 747,469 |  |  |
Goodwill | 82,190 |  | 82,190 |  |  |
Total assets | 16,001,743 |  | 15,822,637 |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |
Other | 686,982 |  | 669,215 |  |  |
Total liabilities | 13,733,946 |  | 13,397,460 |  |  |
Retained earnings | 803,027 |  | 757,921 |  |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax benefits | (257,532) |  | (52,533) |  |  |
Total shareholders’ equity | 2,233,504 | $ 2,303,642 | 2,390,884 | $ 2,367,329 | $ 2,321,293 | $ 2,337,502
Total liabilities and shareholders’ equity | 16,001,743 |  | 15,822,637 |  |  |
Other assets |  |  |  |  |  |
Premises and equipment, net | 5,429,420 |  | 5,392,068 |  |  |
Other assets | 883,594 |  | 747,469 |  |  |
Other liabilities |  |  |  |  |  |
Other liabilities | 686,982 |  | 669,215 |  |  |
American Savings Bank (ASB) |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and due from banks | 128,971 |  | 100,051 |  |  |
Interest-bearing deposits | 12,054 |  | 151,189 |  |  |
Cash and cash equivalents | 141,025 |  | 251,240 |  |  |
Investment securities |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 2,444,267 |  | 2,574,618 |  |  |
Held-to-maturity, at amortized cost (fair value of $440,023 and $510,474, respectively) | 513,767 |  | 522,270 |  |  |
Held-to-maturity investment securities | 440,023 |  | 510,474 |  |  |
Stock in Federal Home Loan Bank, at cost | 13,200 |  | 10,000 |  |  |
Loans held for investment | 5,426,995 |  | 5,211,114 |  |  |
Allowance for credit losses | (69,456) |  | (71,130) |  |  |
Total loans, net | 5,357,539 |  | 5,139,984 |  |  |
Loans held for sale, at lower of cost or fair value | 3,738 |  | 10,404 |  |  |
Other assets | 659,139 |  | 590,897 |  |  |
Goodwill | 82,190 |  | 82,190 |  |  |
Total assets | 9,214,865 |  | 9,181,603 |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |
Deposit liabilities—noninterest-bearing | 2,993,900 |  | 2,976,632 |  |  |
Deposit liabilities—interest-bearing | 5,259,636 |  | 5,195,580 |  |  |
Other borrowings | 241,610 |  | 88,305 |  |  |
Other | 187,770 |  | 193,268 |  |  |
Total liabilities | 8,682,916 |  | 8,453,785 |  |  |
Common stock | 1 |  | 1 |  |  |
Additional paid-in capital | 354,966 |  | 353,895 |  |  |
Retained earnings | 426,040 |  | 411,704 |  |  |
Accumulated other comprehensive loss, net of tax benefits |  |  |  |  |  |
Net unrealized losses on securities | (241,301) |  | (32,037) |  |  |
Retirement benefit plans | (7,757) |  | (5,745) |  |  |
Accumulated other comprehensive loss, net of tax benefits | (249,058) |  | (37,782) |  |  |
Total shareholders’ equity | 531,949 |  | 727,818 |  |  |
Total liabilities and shareholders’ equity | 9,214,865 |  | 9,181,603 |  |  |
Other assets |  |  |  |  |  |
Bank-owned life insurance | 181,166 |  | 177,566 |  |  |
Premises and equipment, net | 199,429 |  | 202,299 |  |  |
Accrued interest receivable | 21,335 |  | 20,854 |  |  |
Mortgage-servicing rights | 9,696 |  | 9,950 |  |  |
Low-income housing investments | 104,592 |  | 110,989 |  |  |
Real estate acquired in settlement of loans, net | 271 |  | 0 |  |  |
Real estate held for sale | 3,030 |  | 0 |  |  |
Deferred tax asset | 84,814 |  | 7,699 |  |  |
Other | 54,806 |  | 61,540 |  |  |
Other assets | 659,139 |  | 590,897 |  |  |
Other liabilities |  |  |  |  |  |
Accrued expenses | 83,915 |  | 87,905 |  |  |
Federal and state income taxes payable | 0 |  | 0 |  |  |
Cashier’s checks | 33,747 |  | 33,675 |  |  |
Advance payments by borrowers | 9,980 |  | 9,994 |  |  |
Other | 60,128 |  | 61,694 |  |  |
Other liabilities | $ 187,770 |  | $ 193,268 |  |  |

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