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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Performance Status (Detail) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 15, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | $ 12,637,768 |  | $ 13,144,894 | $ 12,637,768 |  | $ 12,637,768 |
Loans still accruing interest because collection is considered probable | 900 |  | 1,900 | 900 |  | 900 |
Purchased-credit-impaired loans | 204,100 |  | 8,300 |  |  |  |
Purchases |  |  |  | 636,115 | $ 24,632 | 648,665 | $ 230,962
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 188,800 |  | 998,200 | 188,800 |  | 188,800 |
Specialty lending | FDIC |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Purchased-credit-impaired loans |  | $ 194,455 |  |  |  |  |
Purchases |  | 631,000 |  |  |  |  |
Purchased-credit-impaired loans |  | $ 228,700 |  |  |  |  |
Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 48,335 |  | 75,345 | 48,335 |  | 48,335 |
30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 14,205 |  | 38,471 | 14,205 |  | 14,205 |
30-59 Days past due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,400 |  | 600 | 2,400 |  | 2,400 |
60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 10,009 |  | 15,570 | 10,009 |  | 10,009 |
90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 24,121 |  | 21,304 | 24,121 |  | 24,121 |
Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 12,589,433 |  | 13,069,549 | 12,589,433 |  | 12,589,433 |
60 Days or More Past Due | Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 144,200 |  | 36,000 | 144,200 |  | 144,200 |
Commercial and industrial, including specialty lending |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 6,689,307 |  | 6,672,830 | 6,689,307 |  | 6,689,307 |
Commercial and industrial, including specialty lending | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 6,701 |  | 5,255 | 6,701 |  | 6,701 |
Commercial and industrial, including specialty lending | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,516 |  | 3,123 | 2,516 |  | 2,516 |
Commercial and industrial, including specialty lending | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 104 |  | 717 | 104 |  | 104 |
Commercial and industrial, including specialty lending | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 4,081 |  | 1,415 | 4,081 |  | 4,081 |
Commercial and industrial, including specialty lending | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 6,682,606 |  | 6,667,575 | 6,682,606 |  | 6,682,606 |
Multifamily |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,151,734 |  | 2,213,019 | 2,151,734 |  | 2,151,734 |
Multifamily | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,950 |  | 17,044 | 2,950 |  | 2,950 |
Multifamily | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 10,684 | 0 |  | 0 |
Multifamily | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 5,217 | 0 |  | 0 |
Multifamily | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,950 |  | 1,143 | 2,950 |  | 2,950 |
Multifamily | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,148,784 |  | 2,195,975 | 2,148,784 |  | 2,148,784 |
Commercial real estate owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 842,042 |  | 885,339 | 842,042 |  | 842,042 |
Commercial real estate owner occupied | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,385 |  | 7,877 | 3,385 |  | 3,385 |
Commercial real estate owner occupied | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 5,173 | 0 |  | 0 |
Commercial real estate owner occupied | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 134 |  | 0 | 134 |  | 134 |
Commercial real estate owner occupied | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,251 |  | 2,704 | 3,251 |  | 3,251 |
Commercial real estate owner occupied | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 838,657 |  | 877,462 | 838,657 |  | 838,657 |
Commercial real estate non-owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,211,091 |  | 1,290,730 | 1,211,091 |  | 1,211,091 |
Commercial real estate non-owner occupied | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 2,147 | 0 |  | 0 |
Commercial real estate non-owner occupied | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 2,136 | 0 |  | 0 |
Commercial real estate non-owner occupied | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 0 | 0 |  | 0 |
Commercial real estate non-owner occupied | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 11 | 0 |  | 0 |
Commercial real estate non-owner occupied | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,211,091 |  | 1,288,583 | 1,211,091 |  | 1,211,091 |
Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 212,214 |  | 162,009 | 212,214 |  | 212,214 |
Construction | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 0 | 0 |  | 0 |
Construction | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 0 | 0 |  | 0 |
Construction | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 0 | 0 |  | 0 |
Construction | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 0 | 0 |  | 0 |
Construction | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 212,214 |  | 162,009 | 212,214 |  | 212,214 |
Residential real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 487,199 |  | 497,952 | 487,199 |  | 487,199 |
Purchases |  |  |  | 0 | $ 8,081 | 4,238 | $ 154,955
Residential real estate | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 7,101 |  | 9,523 | 7,101 |  | 7,101 |
Residential real estate | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,751 |  | 5,208 | 1,751 |  | 1,751 |
Residential real estate | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,586 |  | 1,157 | 1,586 |  | 1,586 |
Residential real estate | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,764 |  | 3,158 | 3,764 |  | 3,764 |
Residential real estate | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 480,098 |  | 488,429 | 480,098 |  | 480,098 |
Manufactured housing |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 41,664 |  | 45,076 | 41,664 |  | 41,664 |
Manufactured housing | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 4,424 |  | 4,784 | 4,424 |  | 4,424 |
Manufactured housing | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 380 |  | 901 | 380 |  | 380 |
Manufactured housing | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 506 |  | 537 | 506 |  | 506 |
Manufactured housing | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,538 |  | 3,346 | 3,538 |  | 3,538 |
Manufactured housing | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 37,240 |  | 40,292 | 37,240 |  | 37,240 |
Installment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,002,517 |  | 1,377,939 | 1,002,517 |  | 1,002,517 |
Installment | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 23,774 |  | 28,715 | 23,774 |  | 23,774 |
Installment | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 9,558 |  | 11,246 | 9,558 |  | 9,558 |
Installment | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 7,679 |  | 7,942 | 7,679 |  | 7,679 |
Installment | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 6,537 |  | 9,527 | 6,537 |  | 6,537 |
Installment | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | $ 978,743 |  | $ 1,349,224 | $ 978,743 |  | $ 978,743 |

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