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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 | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 10,884 | $ 19,813
Non-Accrual | 23,191 | 26,415
Current | 6,884,094 | 6,695,032
Loans receivable | 6,943,566 | 6,768,258
Loans receivable, gross | $ 6,944,266 | 6,768,175
Due days for loan payments | 30 days |
Delinquent period | 90 days |
Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | $ 26,097 | 26,915
30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 8,138 | 17,070
90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,746 | 2,743
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 4,900
Non-Accrual | 0 | 0
Current | 3,643,539 | 3,495,600
Loans receivable, gross | 3,645,374 | 3,502,381
Multi-family | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 1,835 | 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 | 129 | 103
Non-Accrual | 14,220 | 17,392
Current | 1,187,571 | 1,130,831
Loans receivable, gross | 1,202,641 | 1,149,090
Commercial and industrial | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 721 | 764
Commercial and industrial | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 129 | 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 | 1,437 | 1,453
Current | 490,277 | 472,501
Loans receivable, gross | 502,150 | 484,728
Commercial real estate - owner occupied | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 10,436 | 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 | 242 | 160
Current | 1,190,591 | 1,213,216
Loans receivable, gross | 1,195,904 | 1,218,719
Commercial real estate - non-owner occupied | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 5,071 | 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 | 81,101 | 85,393
Loans receivable, gross | 81,101 | 85,393
Construction | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 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 | 4,490 | 7,628
Non-Accrual | 5,216 | 5,420
Current | 210,825 | 215,361
Loans receivable, gross | 225,839 | 234,090
Residential real estate | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 5,308 | 5,681
Residential real estate | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 4,490 | 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 | 6,190 | 6,771
Non-Accrual | 1,979 | 1,959
Current | 77,042 | 78,946
Loans receivable, gross | 87,687 | 90,227
Manufactured housing | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 2,476 | 2,551
Manufactured housing | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,444 | 4,028
Manufactured housing | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,746 | 2,743
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 75 | 116
Non-Accrual | 97 | 31
Current | 3,148 | 3,184
Loans receivable, gross | 3,570 | 3,547
Other | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable | 250 | 216
Other | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 75 | 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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