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Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loan (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance total | $ 8,355 | $ 3,433 | $ 8,355 | $ 3,433
Total ending loans balance | 8,358 | 3,451 | 8,358 | 3,451
Allowance For Loan Loss Allocated | 924 |  | 924 |
Average Balance in Impaired Loans total | 9,228 | 3,923 | 9,311 | 2,642
Cash/Accrual Interest Income Recognized, Total | (17) | 7 | 96 | 25
Commercial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 6,573 | 3,433 | 6,573 | 3,433
Recorded Investment With no recorded allowance | 6,576 | 3,451 | 6,576 | 3,451
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 7,437 | 3,923 | 7,509 | 2,642
Cash/Accrual Interest Income Recognized, With no recorded allowance | (25) | 7 | 88 | 25
Unpaid Principal Balance With an allowance recorded | 1,782 |  | 1,782 |
Recorded Investment With an allowance recorded | 1,782 |  | 1,782 |
Allowance For Loan Loss Allocated | 924 |  | 924 |
Average Balance in Impaired Loans With an allowance recorded | 1,791 |  | 1,802 |
Cash/Accrual Interest Income Recognized, With an allowance recorded | 8 |  | 8 |
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 4,496 | 923 | 4,496 | 923
Recorded Investment With no recorded allowance | 4,490 | 934 | 4,490 | 934
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 5,014 | 1,167 | 5,077 | 1,033
Cash/Accrual Interest Income Recognized, With no recorded allowance | (25) | 4 | 71 | 4
Unpaid Principal Balance With an allowance recorded | 845 |  | 845 |
Recorded Investment With an allowance recorded | 845 |  | 845 |
Allowance For Loan Loss Allocated | 145 |  | 145 |
Average Balance in Impaired Loans With an allowance recorded | 852 |  | 874 |
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 841 | 701 | 841 | 701
Recorded Investment With no recorded allowance | 857 | 701 | 857 | 701
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 936 | 468 | 1,119 | 308
Cash/Accrual Interest Income Recognized, With no recorded allowance | (5) |  | 5 | 2
Unpaid Principal Balance With an allowance recorded | 187 |  | 187 |
Recorded Investment With an allowance recorded | 187 |  | 187 |
Allowance For Loan Loss Allocated | 30 |  | 30 |
Average Balance in Impaired Loans With an allowance recorded | 189 |  | 178 |
Cash/Accrual Interest Income Recognized, With an allowance recorded | 4 |  | 4 |
Commercial [Member] | Residential Spec Homes [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Commercial [Member] | Development & Spec Land [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 71 | 102 | 71 | 102
Recorded Investment With no recorded allowance | 69 | 102 | 69 | 102
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 69 | 222 | 72 | 230
Commercial [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 1,165 | 1,707 | 1,165 | 1,707
Recorded Investment With no recorded allowance | 1,160 | 1,714 | 1,160 | 1,714
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,418 | 2,066 | 1,241 | 1,071
Cash/Accrual Interest Income Recognized, With no recorded allowance | 5 | $ 3 | 12 | $ 19
Unpaid Principal Balance With an allowance recorded | 750 |  | 750 |
Recorded Investment With an allowance recorded | 750 |  | 750 |
Allowance For Loan Loss Allocated | 749 |  | 749 |
Average Balance in Impaired Loans With an allowance recorded | 750 |  | 750 |
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 4 |  | $ 4 |

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