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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 | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Jun. 15, 2023 | Dec. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | $ 12,463,485 |  | $ 13,144,894 | $ 12,463,485 |  | $ 12,463,485 |
Loans still accruing interest because collection is considered probable | 600 |  | 1,900 | 600 |  | 600 |
Purchased-credit-impaired loans | 195,800 |  | 8,300 |  |  |  |
Purchases |  |  |  | 101,735 | $ 137,814 | 750,400 | $ 368,776
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 137,100 |  | 998,200 | 137,100 |  | 137,100 |
Specialty lending | FDIC |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Purchases |  | $ 631,000 |  |  |  |  |
Purchased-credit-impaired loans |  | $ 228,700 |  |  |  |  |
Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 58,529 |  | 75,345 | 58,529 |  | 58,529 |
30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 16,294 |  | 38,471 | 16,294 |  | 16,294 |
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 | 1,300 |  | 600 | 1,300 |  | 1,300 |
60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 15,216 |  | 15,570 | 15,216 |  | 15,216 |
90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 27,019 |  | 21,304 | 27,019 |  | 27,019 |
Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 12,404,956 |  | 13,069,549 | 12,404,956 |  | 12,404,956 |
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 | 106,900 |  | 36,000 | 106,900 |  | 106,900 |
Commercial and industrial, including specialty lending |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 6,617,508 |  | 6,672,830 | 6,617,508 |  | 6,617,508 |
Commercial and industrial, including specialty lending | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 8,633 |  | 5,255 | 8,633 |  | 8,633 |
Commercial and industrial, including specialty lending | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,070 |  | 3,123 | 2,070 |  | 2,070 |
Commercial and industrial, including specialty lending | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,273 |  | 717 | 1,273 |  | 1,273 |
Commercial and industrial, including specialty lending | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 5,290 |  | 1,415 | 5,290 |  | 5,290 |
Commercial and industrial, including specialty lending | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 6,608,875 |  | 6,667,575 | 6,608,875 |  | 6,608,875 |
Multifamily |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,130,213 |  | 2,213,019 | 2,130,213 |  | 2,130,213 |
Multifamily | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 0 |  | 17,044 | 0 |  | 0 |
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 | 0 |  | 1,143 | 0 |  | 0 |
Multifamily | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,130,213 |  | 2,195,975 | 2,130,213 |  | 2,130,213 |
Commercial real estate owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 794,815 |  | 885,339 | 794,815 |  | 794,815 |
Commercial real estate owner occupied | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 10,676 |  | 7,877 | 10,676 |  | 10,676 |
Commercial real estate owner occupied | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 50 |  | 5,173 | 50 |  | 50 |
Commercial real estate owner occupied | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,234 |  | 0 | 3,234 |  | 3,234 |
Commercial real estate owner occupied | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 7,392 |  | 2,704 | 7,392 |  | 7,392 |
Commercial real estate owner occupied | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 784,139 |  | 877,462 | 784,139 |  | 784,139 |
Commercial real estate non-owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 1,178,203 |  | 1,290,730 | 1,178,203 |  | 1,178,203 |
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 | 1,178,203 |  | 1,288,583 | 1,178,203 |  | 1,178,203 |
Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 252,588 |  | 162,009 | 252,588 |  | 252,588 |
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 | 252,588 |  | 162,009 | 252,588 |  | 252,588 |
Residential real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 483,133 |  | 497,952 | 483,133 |  | 483,133 |
Purchases |  |  |  | 0 | $ 15,067 | 4,238 | $ 170,022
Residential real estate | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 10,502 |  | 9,523 | 10,502 |  | 10,502 |
Residential real estate | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,773 |  | 5,208 | 3,773 |  | 3,773 |
Residential real estate | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 2,898 |  | 1,157 | 2,898 |  | 2,898 |
Residential real estate | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,831 |  | 3,158 | 3,831 |  | 3,831 |
Residential real estate | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 472,631 |  | 488,429 | 472,631 |  | 472,631 |
Manufactured housing |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 40,129 |  | 45,076 | 40,129 |  | 40,129 |
Manufactured housing | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 4,247 |  | 4,784 | 4,247 |  | 4,247 |
Manufactured housing | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 673 |  | 901 | 673 |  | 673 |
Manufactured housing | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 367 |  | 537 | 367 |  | 367 |
Manufactured housing | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 3,207 |  | 3,346 | 3,207 |  | 3,207 |
Manufactured housing | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 35,882 |  | 40,292 | 35,882 |  | 35,882 |
Installment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 966,896 |  | 1,377,939 | 966,896 |  | 966,896 |
Installment | Total past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 24,471 |  | 28,715 | 24,471 |  | 24,471 |
Installment | 30-59 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 9,728 |  | 11,246 | 9,728 |  | 9,728 |
Installment | 60-89 Days past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 7,444 |  | 7,942 | 7,444 |  | 7,444 |
Installment | 90 Days or more past due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | 7,299 |  | 9,527 | 7,299 |  | 7,299 |
Installment | Current |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans and leases receivable | $ 942,425 |  | $ 1,349,224 | $ 942,425 |  | $ 942,425 |

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