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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 | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment | $ 29,800 | $ 47,000
Allowance for Loan Losses Allocated | 0 |
With No Related Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 33,538 | 50,076
Recorded Investment | 29,797 | 46,988
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 36,824 | 34,674
Interest Income Recognized | 1,416 | 2,250
With an Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 1,259 | 5,090
Interest Income Recognized | 0 | 149
Commercial and industrial | With No Related Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 1,750 | 895
Recorded Investment | 1,626 | 864
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 1,075 | 643
Interest Income Recognized | 107 | 60
Commercial and industrial | With an Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 589 | 0
Interest Income Recognized | 0 | 0
Commercial real estate - owner occupied | With No Related Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 5,413 | 15,832
Recorded Investment | 5,395 | 15,132
Allowance for Loan Losses Allocated | 0 |
Average Recorded Investment | 8,264 | 11,890
Interest Income Recognized | 297 | 797
Commercial real estate - owner occupied | With an Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 0 | 0
Interest Income Recognized | 0 | 0
Commercial real estate – investor | With No Related Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 12,633 | 19,457
Recorded Investment | 9,738 | 17,923
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 13,934 | 8,825
Interest Income Recognized | 382 | 768
Commercial real estate – investor | With an Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 670 | 3,386
Interest Income Recognized | 0 | 81
Residential mortgage | With No Related Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 10,441 | 10,951
Recorded Investment | 10,064 | 10,605
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 10,787 | 10,928
Interest Income Recognized | 475 | 481
Residential mortgage | With an Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 0 | 1,585
Interest Income Recognized | 0 | 62
Consumer | With No Related Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 3,301 | 2,941
Recorded Investment | 2,974 | 2,464
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 2,764 | 2,388
Interest Income Recognized | 155 | 144
Consumer | With an Allowance Recorded |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance | 0 | 0
Recorded Investment | 0 | 0
Allowance for Loan Losses Allocated | 0 | 0
Average Recorded Investment | 0 | 119
Interest Income Recognized | $ 0 | $ 6

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