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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 |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 113,159 |  | $ 113,159 | $ 35,123
Non-accrual | 67,341 |  | 67,341 | 20,021
Loans and leases not past due | 7,159,288 |  | 7,159,288 | 7,244,271
Purchased-credit-impaired loans | 15,700 | $ 17,488 |  |
Loans and lease receivable, gross | 7,272,447 |  | $ 7,272,447 | 7,318,988
Financing receivable, at amortized cost or lower of cost or market |  |  |  | 7,316,903
Delinquent period |  |  | 30 days |
Loans receivable, PPP | 4,760,427 |  | $ 4,760,427 | 0
30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 21,838 |  | 21,838 |
60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 22,242 |  | 22,242 |
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 | 69,079 |  | 69,079 | 1,794
Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 23,803 |  | 23,803 | 2,133
Non-accrual | 7,013 |  | 7,013 | 4,117
Loans and leases not past due | 1,558,036 |  | 1,558,036 | 1,901,336
Purchased-credit-impaired loans |  | 1,688 |  |
Loans and lease receivable, gross | 1,581,839 |  | 1,581,839 | 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 | 16,790 |  | 16,790 |
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 | 7,013 |  | 7,013 | 0
Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 10,620 |  | 10,620 | 2,395
Non-accrual | 9,974 |  | 9,974 | 4,531
Loans and leases not past due | 2,088,822 |  | 2,088,822 | 1,882,700
Purchased-credit-impaired loans |  | 354 |  |
Loans and lease receivable, gross | 2,099,442 |  | 2,099,442 | 1,889,980
Commercial and industrial | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 523 |  | 523 |
Commercial and industrial | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 123 |  | 123 |
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 | 9,974 |  | 9,974 | 0
Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 8,910 |  | 8,910 | 5,388
Non-accrual | 4,022 |  | 4,022 | 1,963
Loans and leases not past due | 535,862 |  | 535,862 | 537,992
Purchased-credit-impaired loans |  | 6,664 |  |
Loans and lease receivable, gross | 544,772 |  | 544,772 | 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 | 4,888 |  | 4,888 |
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 | 4,022 |  | 4,022 | 0
Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 30,354 |  | 30,354 | 8,034
Non-accrual | 30,257 |  | 30,257 | 76
Loans and leases not past due | 1,214,419 |  | 1,214,419 | 1,211,892
Purchased-credit-impaired loans |  | 3,527 |  |
Loans and lease receivable, gross | 1,244,773 |  | 1,244,773 | 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 | 97 |  | 97 |
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 | 30,257 |  | 30,257 | 0
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 | 0
Non-accrual | 0 |  | 0 | 0
Loans and leases not past due | 128,834 |  | 128,834 | 118,418
Purchased-credit-impaired loans |  | 0 |  |
Loans and lease receivable, gross | 128,834 |  | 128,834 | 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 | 16,929 |  | 16,929 | 5,924
Non-accrual | 7,857 |  | 7,857 | 6,128
Loans and leases not past due | 331,180 |  | 331,180 | 359,491
Purchased-credit-impaired loans |  | 3,471 |  |
Loans and lease receivable, gross | 348,109 |  | 348,109 | 375,014
Residential real estate | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 8,631 |  | 8,631 |
Residential real estate | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 441 |  | 441 |
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 | 7,857 |  | 7,857 | 0
Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 6,241 |  | 6,241 | 5,493
Non-accrual | 3,331 |  | 3,331 | 1,655
Loans and leases not past due | 60,624 |  | 60,624 | 61,649
Purchased-credit-impaired loans |  | 1,601 |  |
Loans and lease receivable, gross | 66,865 |  | 66,865 | 70,398
Manufactured housing | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 1,172 |  | 1,172 |
Manufactured housing | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
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 | 5,069 |  | 5,069 | 1,794
Other consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 16,302 |  | 16,302 | 5,756
Non-accrual | 4,887 |  | 4,887 | 1,551
Loans and leases not past due | 1,241,511 |  | 1,241,511 | 1,170,793
Purchased-credit-impaired loans |  | $ 183 |  |
Loans and lease receivable, gross | 1,257,813 |  | 1,257,813 | 1,178,283
Other consumer | 30 to 59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 11,415 |  | 11,415 |
Other consumer | 60 to 89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Other consumer | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due |  |  |  | 5,756
Other consumer | 90 Days or More Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 4,887 |  | $ 4,887 | $ 0

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