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Bank segment - Balance sheet data (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Cash and cash equivalents | $ 247,443 |  | $ 341,421 | $ 574,482 |  |
Investment securities |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 2,509,906 |  | 1,970,417 |  |  |
Held-to-maturity investment securities, at amortized cost | 375,655 |  | 226,947 |  |  |
Held-to-maturity investment securities | 374,141 |  | 229,963 |  |  |
Stock in Federal Home Loan Bank, at cost | 10,000 |  | 8,680 |  |  |
Allowance for credit losses | (78,252) | $ (91,793) | (101,201) | (81,307) | $ (77,084) | $ (53,355)
Total loans, net | 5,106,207 |  | 5,232,642 |  |  |
Loans held for sale, at lower of cost or fair value | 50,877 |  | 28,275 |  |  |
Other assets | 668,368 |  | 629,149 |  |  |
Goodwill | 82,190 |  | 82,190 |  |  |
Total assets | 15,606,729 |  | 15,004,007 |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |
Other | 584,610 |  | 618,438 |  |  |
Total liabilities | 13,205,107 |  | 12,632,212 |  |  |
Commitments and contingencies |  |  |  |  |  |
Retained earnings | 714,317 |  | 660,398 |  |  |
Accumulated other comprehensive income (loss), net of taxes |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax benefits | (28,808) |  | (1,264) |  |  |
Total shareholders’ equity | 2,367,329 | $ 2,321,293 | 2,337,502 | $ 2,291,398 | $ 2,276,505 | $ 2,280,260
Total liabilities and shareholders’ equity | 15,606,729 |  | 15,004,007 |  |  |
Other assets |  |  |  |  |  |
Premises and equipment, net | 5,310,162 |  | 5,265,735 |  |  |
Other assets | 668,368 |  | 629,149 |  |  |
Other liabilities |  |  |  |  |  |
Other liabilities | 584,610 |  | 618,438 |  |  |
American Savings Bank (ASB) |  |  |  |  |  |
Assets |  |  |  |  |  |
Cash and due from banks | 115,567 |  | 178,422 |  |  |
Interest-bearing deposits | 105,800 |  | 114,304 |  |  |
Cash and cash equivalents | 221,367 |  | 292,726 |  |  |
Investment securities |  |  |  |  |  |
Available-for-sale investment securities, at fair value | 2,509,906 |  | 1,970,417 |  |  |
Held-to-maturity investment securities, at amortized cost | 375,655 |  | 226,947 |  |  |
Held-to-maturity investment securities | 374,141 |  | 229,963 |  |  |
Stock in Federal Home Loan Bank, at cost | 10,000 |  | 8,680 |  |  |
Collateral-dependent loans, amortized cost | 5,184,459 |  | 5,333,843 |  |  |
Allowance for credit losses | (78,252) |  | (101,201) |  |  |
Total loans, net | 5,106,207 |  | 5,232,642 |  |  |
Loans held for sale, at lower of cost or fair value | 50,877 |  | 28,275 |  |  |
Other assets | 553,702 |  | 554,656 |  |  |
Goodwill | 82,190 |  | 82,190 |  |  |
Total assets | 8,909,904 |  | 8,396,533 |  |  |
Liabilities and shareholder’s equity |  |  |  |  |  |
Deposit liabilities—noninterest-bearing | 2,868,770 |  | 2,598,500 |  |  |
Deposit liabilities—interest-bearing | 5,004,660 |  | 4,788,457 |  |  |
Other borrowings | 129,665 |  | 89,670 |  |  |
Other | 166,419 |  | 183,731 |  |  |
Total liabilities | 8,169,514 |  | 7,660,358 |  |  |
Commitments and contingencies |  |  |  |  |  |
Common stock | 1 |  | 1 |  |  |
Additional paid-in capital | 352,888 |  | 351,758 |  |  |
Retained earnings | 401,310 |  | 369,470 |  |  |
Accumulated other comprehensive income (loss), net of taxes |  |  |  |  |  |
Net unrealized gains (losses) on securities | (8,815) |  | 19,986 |  |  |
Retirement benefit plans | (4,994) |  | (5,040) |  |  |
Accumulated other comprehensive loss, net of tax benefits | (13,809) |  | 14,946 |  |  |
Total shareholders’ equity | 740,390 |  | 736,175 |  |  |
Total liabilities and shareholders’ equity | 8,909,904 |  | 8,396,533 |  |  |
Other assets |  |  |  |  |  |
Bank-owned life insurance | 164,453 |  | 163,265 |  |  |
Premises and equipment, net | 205,917 |  | 206,134 |  |  |
Accrued interest receivable | 23,064 |  | 24,616 |  |  |
Mortgage-servicing rights | 10,754 |  | 10,020 |  |  |
Low-income housing investments | 87,371 |  | 83,435 |  |  |
Other | 62,143 |  | 67,186 |  |  |
Other assets | 553,702 |  | 554,656 |  |  |
Other liabilities |  |  |  |  |  |
Accrued expenses | 61,156 |  | 62,694 |  |  |
Federal and state income taxes payable | 1,508 |  | 6,582 |  |  |
Cashier’s checks | 30,818 |  | 38,011 |  |  |
Advance payments by borrowers | 10,374 |  | 10,207 |  |  |
Other | 62,563 |  | 66,237 |  |  |
Other liabilities | $ 166,419 |  | $ 183,731 |  |  |

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