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Loans Receivable, Net - Summary of Loans Individually Evaluated for Impairment by Loan Portfolio Segment Excluding PCI Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 33,088 |  | $ 33,088 |  | $ 46,988
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
With No Related Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 36,410 |  | 36,410 |  | 50,076
Recorded Investment | 33,088 |  | 33,088 |  | 46,988
Average Recorded Investment | 32,180 | $ 38,558 | 37,645 | $ 31,595 |
Interest Income Recognized | 398 | 765 | 1,087 | 1,564 |
With an Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 736 | 4,551 | 1,574 | 6,362 |
Interest Income Recognized | 0 | 13 | 0 | 149 |
Commercial and Industrial | With No Related Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 1,824 |  | 1,824 |  | 895
Recorded Investment | 1,738 |  | 1,738 |  | 864
Average Recorded Investment | 982 | 908 | 906 | 588 |
Interest Income Recognized | 69 | 26 | 85 | 50 |
Commercial and Industrial | With an Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 736 | 0 | 736 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Commercial Real Estate - Owner Occupied | With No Related Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 5,459 |  | 5,459 |  | 15,832
Recorded Investment | 5,446 |  | 5,446 |  | 15,132
Average Recorded Investment | 5,484 | 11,217 | 8,978 | 11,080 |
Interest Income Recognized | 75 | 335 | 226 | 520 |
Commercial Real Estate - Owner Occupied | With an Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance |  |  |  |  | 0
Recorded Investment |  |  |  |  | 0
Allowance for Loan Losses Allocated |  |  |  |  | 0
Average Recorded Investment | 0 | 0 | 0 | 0 |
Interest Income Recognized |  | 0 |  | 0 |
Commercial Real Estate - Investor | With No Related Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 15,290 |  | 15,290 |  | 19,457
Recorded Investment | 12,760 |  | 12,760 |  | 17,923
Average Recorded Investment | 12,191 | 11,147 | 14,259 | 6,550 |
Interest Income Recognized | 102 | 240 | 304 | 487 |
Commercial Real Estate - Investor | With an Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 4,551 | 838 | 4,233 |
Interest Income Recognized | 0 | 13 | 0 | 81 |
Residential Real Estate | With No Related Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 10,828 |  | 10,828 |  | 10,951
Recorded Investment | 10,454 |  | 10,454 |  | 10,605
Average Recorded Investment | 10,741 | 12,791 | 10,873 | 11,009 |
Interest Income Recognized | 119 | 128 | 356 | 401 |
Residential Real Estate | With an Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 0 | 0 | 0 | 1,981 |
Interest Income Recognized | 0 | 0 | 0 | 62 |
Consumer | With No Related Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 3,009 |  | 3,009 |  | 2,941
Recorded Investment | 2,690 |  | 2,690 |  | 2,464
Average Recorded Investment | 2,782 | 2,495 | 2,629 | 2,368 |
Interest Income Recognized | 33 | 36 | 116 | 106 |
Consumer | With an Allowance Recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 0 |  | 0 |  | 0
Recorded Investment | 0 |  | 0 |  | 0
Allowance for Loan Losses Allocated | 0 |  | 0 |  | $ 0
Average Recorded Investment | 0 | 0 | 0 | 148 |
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 6 |

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