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Loans Receivable and Allowance for Loan Losses - Non-Covered Loans and Covered Loans by Class and Performance Status (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 8,955 | $ 19,813
Non-Accrual | 25,995 | 26,415
Current | 7,121,560 | 6,695,032
Loans receivable, gross | $ 7,181,084 | 6,768,175
Delinquent period | 30 days |
Due days for loan payments | 90 days |
Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | $ 24,574 | 26,915
30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 6,294 | 17,070
90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,661 | 2,743
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 4,900
Non-Accrual | 1,343 | 0
Current | 3,539,640 | 3,495,600
Loans receivable, gross | 3,542,770 | 3,502,381
Multi-family | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,787 | 1,881
Multi-family | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 4,900
Multi-family | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,087 | 103
Non-Accrual | 13,683 | 17,392
Current | 1,251,148 | 1,130,831
Loans receivable, gross | 1,266,520 | 1,149,090
Commercial and industrial | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 602 | 764
Commercial and industrial | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 1,087 | 103
Commercial and industrial | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial real estate - owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 202
Non-Accrual | 718 | 1,453
Current | 534,923 | 472,501
Loans receivable, gross | 545,231 | 484,728
Commercial real estate - owner occupied | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 9,590 | 10,572
Commercial real estate - owner occupied | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 202
Commercial real estate - owner occupied | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial real estate - non-owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 93
Non-Accrual | 2,536 | 160
Current | 1,148,581 | 1,213,216
Loans receivable, gross | 1,155,998 | 1,218,719
Commercial real estate - non-owner occupied | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 4,881 | 5,250
Commercial real estate - non-owner occupied | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 93
Commercial real estate - non-owner occupied | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Non-Accrual | 0 | 0
Current | 88,141 | 85,393
Loans receivable, gross | 88,141 | 85,393
Construction | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 0 | 0
Construction | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Construction | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,174 | 7,628
Non-Accrual | 5,606 | 5,420
Current | 480,381 | 215,361
Loans receivable, gross | 493,222 | 234,090
Residential real estate | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 5,061 | 5,681
Residential real estate | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,174 | 7,628
Residential real estate | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Manufactured housing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 5,638 | 6,771
Non-Accrual | 2,015 | 1,959
Current | 75,250 | 78,946
Loans receivable, gross | 85,328 | 90,227
Manufactured housing | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2,425 | 2,551
Manufactured housing | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,977 | 4,028
Manufactured housing | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,661 | 2,743
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 56 | 116
Non-Accrual | 94 | 31
Current | 3,496 | 3,184
Loans receivable, gross | 3,874 | 3,547
Other | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 228 | 216
Other | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 56 | 116
Other | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 0 | $ 0

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