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Loans Receivable and Allowance for Loan Losses - Loans by Type and Performance Status (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | $ 15,551 | $ 19,813
Non-Accrual | 27,494 | 26,415
Current | 7,073,879 | 6,695,032
Total loans | 7,138,498 | 6,768,175
Loans receivable, at amortized cost or lower of cost or market | $ 7,138,498 | 6,768,175
Due days for loan payments (days) | 30 days |
Delinquent period (days) | 90 days |
30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | $ 13,363 | 17,070
90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 2,188 | 2,743
Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 21,574 | 26,915
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 4,900
Non-Accrual | 1,155 | 0
Current | 3,282,452 | 3,495,600
Total loans | 3,285,297 | 3,502,381
Loans receivable, at amortized cost or lower of cost or market | 3,285,297 | 3,502,381
Multi-family | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 4,900
Multi-family | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Multi-family | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,690 | 1,881
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 1,914 | 103
Non-Accrual | 17,764 | 17,392
Current | 1,353,586 | 1,130,831
Total loans | 1,373,800 | 1,149,090
Loans receivable, at amortized cost or lower of cost or market | 1,373,800 | 1,149,090
Commercial and industrial | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 1,914 | 103
Commercial and industrial | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Commercial and industrial | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 536 | 764
Commercial real estate owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 193 | 202
Non-Accrual | 1,037 | 1,453
Current | 567,809 | 472,501
Total loans | 577,477 | 484,728
Loans receivable, at amortized cost or lower of cost or market | 577,477 | 484,728
Commercial real estate owner occupied | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 193 | 202
Commercial real estate owner occupied | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Commercial real estate owner occupied | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 8,438 | 10,572
Commercial real estate non-owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 1,190 | 93
Non-Accrual | 129 | 160
Current | 1,119,443 | 1,213,216
Total loans | 1,125,106 | 1,218,719
Loans receivable, at amortized cost or lower of cost or market | 1,125,106 | 1,218,719
Commercial real estate non-owner occupied | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 1,190 | 93
Commercial real estate non-owner occupied | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Commercial real estate non-owner occupied | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,344 | 5,250
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Non-Accrual | 0 | 0
Current | 56,491 | 85,393
Total loans | 56,491 | 85,393
Loans receivable, at amortized cost or lower of cost or market | 56,491 | 85,393
Construction | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Construction | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Construction | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 0 | 0
Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 5,940 | 7,628
Non-Accrual | 5,605 | 5,420
Current | 550,679 | 215,361
Total loans | 566,561 | 234,090
Loans receivable, at amortized cost or lower of cost or market | 566,561 | 234,090
Residential real estate | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 5,940 | 7,628
Residential real estate | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Residential real estate | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 4,337 | 5,681
Manufactured housing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 6,114 | 6,771
Non-Accrual | 1,693 | 1,959
Current | 69,916 | 78,946
Total loans | 79,731 | 90,227
Loans receivable, at amortized cost or lower of cost or market | 79,731 | 90,227
Manufactured housing | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 3,926 | 4,028
Manufactured housing | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 2,188 | 2,743
Manufactured housing | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 2,008 | 2,551
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 200 | 116
Non-Accrual | 111 | 31
Current | 73,503 | 3,184
Total loans | 74,035 | 3,547
Loans receivable, at amortized cost or lower of cost or market | 74,035 | 3,547
Other | 30 to 89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 200 | 116
Other | 90 Days Or More Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due Still Accruing | 0 | 0
Other | Purchased credit impaired loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 221 | $ 216

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