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Loans and Leases Receivable and Allowance for Credit Losses - Non-Covered Loans and Covered Loans by Class and Performance Status (Detail) - USD ($) $ in Thousands |  | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 64,700 |  | $ 64,700 | $ 35,123
Non-accrual | 43,880 |  | 43,880 | 20,021
Loans and leases not past due | 7,636,192 |  | 7,636,192 | 7,244,271
Purchased-credit-impaired loans | 14,400 | $ 17,488 |  |
Loans and lease receivable, gross | 7,700,892 |  | $ 7,700,892 | 7,318,988
Financing receivable, at amortized cost or lower of cost or market |  |  |  | 7,316,903
Delinquent period |  |  | 30 days |
Loans receivable, PPP | 4,964,105 |  | $ 4,964,105 | 0
30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 6,688 |  | 6,688 |
60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 26,847 |  | 26,847 |
30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 33,329
90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 31,165 |  | 31,165 | 1,794
Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 20,236 |  | 20,236 | 2,133
Non-accrual | 11,710 |  | 11,710 | 4,117
Loans and leases not past due | 1,930,064 |  | 1,930,064 | 1,901,336
Purchased-credit-impaired loans |  | 1,688 |  |
Loans and lease receivable, gross | 1,950,300 |  | 1,950,300 | 1,909,274
Multi-family | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Multi-family | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 15,446 |  | 15,446 |
Multi-family | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 2,133
Multi-family | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 4,790 |  | 4,790 | 0
Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 9,767 |  | 9,767 | 2,395
Non-accrual | 9,633 |  | 9,633 | 4,531
Loans and leases not past due | 2,210,948 |  | 2,210,948 | 1,882,700
Purchased-credit-impaired loans |  | 354 |  |
Loans and lease receivable, gross | 2,220,715 |  | 2,220,715 | 1,889,980
Commercial and industrial | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial and industrial | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,072 |  | 2,072 |
Commercial and industrial | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 2,395
Commercial and industrial | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 7,695 |  | 7,695 | 0
Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 3,388 |  | 3,388 | 5,388
Non-accrual | 3,599 |  | 3,599 | 1,963
Loans and leases not past due | 554,207 |  | 554,207 | 537,992
Purchased-credit-impaired loans |  | 6,664 |  |
Loans and lease receivable, gross | 557,595 |  | 557,595 | 552,007
Commercial real estate owner occupied | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial real estate owner occupied | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 952 |  | 952 |
Commercial real estate owner occupied | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 5,388
Commercial real estate owner occupied | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,436 |  | 2,436 | 0
Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,356 |  | 2,356 | 8,034
Non-accrual | 2,408 |  | 2,408 | 76
Loans and leases not past due | 1,213,160 |  | 1,213,160 | 1,211,892
Purchased-credit-impaired loans |  | 3,527 |  |
Loans and lease receivable, gross | 1,215,516 |  | 1,215,516 | 1,223,529
Commercial real estate non-owner occupied | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial real estate non-owner occupied | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial real estate non-owner occupied | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 8,034
Commercial real estate non-owner occupied | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,356 |  | 2,356 | 0
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 | 0
Non-accrual |  |  |  | 0
Loans and leases not past due | 122,963 |  | 122,963 | 118,418
Purchased-credit-impaired loans |  | 0 |  |
Loans and lease receivable, gross | 122,963 |  | 122,963 | 118,418
Construction | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 0
Construction | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 | 0
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 9,923 |  | 9,923 | 5,924
Non-accrual | 10,634 |  | 10,634 | 6,128
Loans and leases not past due | 325,529 |  | 325,529 | 359,491
Purchased-credit-impaired loans |  | 3,471 |  |
Loans and lease receivable, gross | 335,452 |  | 335,452 | 375,014
Residential real estate | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 436 |  | 436 |
Residential real estate | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 3,160 |  | 3,160 |
Residential real estate | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 5,924
Residential real estate | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 6,327 |  | 6,327 | 0
Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 5,855 |  | 5,855 | 5,493
Non-accrual | 2,778 |  | 2,778 | 1,655
Loans and leases not past due | 58,783 |  | 58,783 | 61,649
Purchased-credit-impaired loans |  | 1,601 |  |
Loans and lease receivable, gross | 64,638 |  | 64,638 | 70,398
Manufactured housing | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 784 |  | 784 |
Manufactured housing | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 608 |  | 608 |
Manufactured housing | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 3,699
Manufactured housing | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 4,463 |  | 4,463 | 1,794
Installment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 13,175 |  | 13,175 | 5,756
Non-accrual | 3,118 |  | 3,118 | 1,551
Loans and leases not past due | 1,220,538 |  | 1,220,538 | 1,170,793
Purchased-credit-impaired loans |  | $ 183 |  |
Loans and lease receivable, gross | 1,233,713 |  | 1,233,713 | 1,178,283
Installment | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 5,468 |  | 5,468 |
Installment | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 4,609 |  | 4,609 |
Installment | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 5,756
Installment | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 3,098 |  | $ 3,098 | $ 0

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