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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 | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 8,559 | $ 19,813
Non-Accrual | 23,641 | 26,415
Current | 7,188,087 | 6,695,032
Loans receivable, gross | 7,242,995 | 6,768,175
Loans and leases receivable, at amortized cost or lower of cost or market | $ 7,242,995 | 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 | $ 22,708 | 26,915
30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 6,259 | 17,070
90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,300 | 2,743
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 4,900
Non-Accrual | 1,343 | 0
Current | 3,501,450 | 3,495,600
Loans receivable, gross | 3,504,540 | 3,502,381
Multi-family | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,747 | 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 | 418 | 103
Non-Accrual | 13,287 | 17,392
Current | 1,271,813 | 1,130,831
Loans receivable, gross | 1,286,090 | 1,149,090
Commercial and industrial | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 572 | 764
Commercial and industrial | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 418 | 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 | 1,298 | 1,453
Current | 545,647 | 472,501
Loans receivable, gross | 555,614 | 484,728
Commercial real estate owner occupied | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 8,669 | 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 | 158 | 160
Current | 1,153,107 | 1,213,216
Loans receivable, gross | 1,157,849 | 1,218,719
Commercial real estate non-owner occupied | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 4,584 | 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 | 95,250 | 85,393
Loans receivable, gross | 95,250 | 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 | 2,321 | 7,628
Non-Accrual | 5,522 | 5,420
Current | 497,211 | 215,361
Loans receivable, gross | 509,853 | 234,090
Residential real estate | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 4,799 | 5,681
Residential real estate | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,321 | 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 | 5,775 | 6,771
Non-Accrual | 1,921 | 1,959
Current | 72,777 | 78,946
Loans receivable, gross | 82,589 | 90,227
Manufactured housing | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2,116 | 2,551
Manufactured housing | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,475 | 4,028
Manufactured housing | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,300 | 2,743
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 45 | 116
Non-Accrual | 112 | 31
Current | 50,832 | 3,184
Loans receivable, gross | 51,210 | 3,547
Other | Purchased Credit Impaired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 221 | 216
Other | 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 45 | 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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