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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | $ 11,884,664 | $ 11,889,120 |  |
Loans and leases receivable | 11,936,621 | 11,963,855 |  |
Loans receivable, mortgage finance, at fair value | 962,610 | 897,912 |  |
Allowance for credit losses on loans and leases | (133,296) | (135,311) | $ (130,281) | $ (130,924)
Total loans and leases receivable, net of allowance for credit losses on loans and leases | 12,765,935 | 12,726,456 |  |
Loans and leases receivable | 11,936,621 | 11,963,855 |  |
Loans receivable, PPP | 52,000 | 74,700 |  |
Deferred (fees) costs and unamortized (discounts) premiums, net | (20,400) | (22,700) |  |
Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 2,123,675 | 2,138,622 |  |
Allowance for credit losses on loans and leases | (18,307) | (16,343) | (15,084) | (14,541)
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 185,601 | 166,393 |  |
Allowance for credit losses on loans and leases | (1,866) | (1,482) | (2,336) | (1,913)
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 482,537 | 484,435 |  |
Allowance for credit losses on loans and leases | (6,707) | (6,586) | (6,853) | (6,094)
Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 37,382 | 38,670 |  |
Allowance for credit losses on loans and leases | (4,160) | (4,239) | $ (4,339) | $ (4,430)
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 10,624,096 | 10,565,824 |  |
Commercial | Specialized lending |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 5,104,405 | 5,006,693 |  |
Commercial | Other commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 1,222,053 | 1,279,147 |  |
Commercial | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 2,123,675 | 2,138,622 |  |
Commercial | Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 806,278 | 797,319 |  |
Commercial | Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 1,182,084 | 1,177,650 |  |
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 185,601 | 166,393 |  |
Commercial | Direct finance equipment leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 212,100 | 205,700 |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 1,312,525 | 1,398,031 |  |
Consumer | Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 482,537 | 484,435 |  |
Consumer | Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 37,382 | 38,670 |  |
Consumer | Personal |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | 492,892 | 555,533 |  |
Consumer | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total consumer loans receivable | $ 299,714 | $ 319,393 |  |

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