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Loans Receivable, Net - Summary of Loans Individually Evaluated for Impairment by Loan Portfolio Segment Excluding PCI Loans (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 27,817,000 |  | $ 27,817,000 |  | $ 29,797,000
Allowance for Loan Losses Allocated | 547,000 |  | 547,000 |  | 0
With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 27,517,000 |  | 27,517,000 |  | 33,538,000
Recorded Investment | 25,539,000 |  | 25,539,000 |  | 29,797,000
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 26,107,000 | $ 32,180,000 | 27,990,000 | $ 37,645,000 |
Interest Income Recognized | 262,000 | 398,000 | 911,000 | 1,087,000 |
With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 2,415,000 |  | 2,415,000 |  | 0
Recorded Investment | 2,278,000 |  | 2,278,000 |  | 0
Allowance for Loan Losses Allocated | 547,000 |  | 547,000 |  | 0
Average Recorded Investment | 2,086,000 | 736,000 | 2,168,000 | 1,574,000 |
Interest Income Recognized | 70,000 | 0 | 106,000 | 0 |
Commercial and Industrial | With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 268,000 |  | 268,000 |  | 1,750,000
Recorded Investment | 246,000 |  | 246,000 |  | 1,626,000
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 247,000 | 982,000 | 593,000 | 906,000 |
Interest Income Recognized | 1,000 | 69,000 | 5,000 | 85,000 |
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 | 0 | 736,000 | 0 | 736,000 |
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 | 3,908,000 |  | 3,908,000 |  | 5,413,000
Recorded Investment | 3,874,000 |  | 3,874,000 |  | 5,395,000
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 4,290,000 | 5,484,000 | 4,221,000 | 8,978,000 |
Interest Income Recognized | 6,000 | 75,000 | 128,000 | 226,000 |
Commercial real estate – owner occupied | With an allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 2,415,000 |  | 2,415,000 |  | 0
Recorded Investment | 2,278,000 |  | 2,278,000 |  | 0
Allowance for Loan Losses Allocated | 547,000 |  | 547,000 |  | 0
Average Recorded Investment | 2,086,000 | 0 | 2,168,000 | 0 |
Interest Income Recognized | 70,000 | 0 | 106,000 | 0 |
Commercial real estate – investor | With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 9,152,000 |  | 9,152,000 |  | 12,633,000
Recorded Investment | 7,975,000 |  | 7,975,000 |  | 9,738,000
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 8,072,000 | 12,191,000 | 9,869,000 | 14,259,000 |
Interest Income Recognized | 85,000 | 102,000 | 243,000 | 304,000 |
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 | 0 | 0 | 838,000 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Residential real estate | With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 10,459,000 |  | 10,459,000 |  | 10,441,000
Recorded Investment | 10,093,000 |  | 10,093,000 |  | 10,064,000
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 10,136,000 | 10,741,000 | 10,091,000 | 10,873,000 |
Interest Income Recognized | 128,000 | 119,000 | 399,000 | 356,000 |
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 | 0 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Consumer | With no related allowance recorded |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Principal Balance | 3,730,000 |  | 3,730,000 |  | 3,301,000
Recorded Investment | 3,351,000 |  | 3,351,000 |  | 2,974,000
Allowance for Loan Losses Allocated | 0 |  | 0 |  | 0
Average Recorded Investment | 3,362,000 | 2,782,000 | 3,216,000 | 2,629,000 |
Interest Income Recognized | 42,000 | 33,000 | 136,000 | 116,000 |
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 | 0 |
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 0 |

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