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Non-performing Assets and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance total | $ 7,141 | $ 2,250 | $ 7,005
Total ending loans balance | 7,187 | 2,250 | 7,019
Allowance For Loan Loss Allocated | 184 | 4 | 202
Average Balance in Impaired Loans total | 3,774 | 2,905 | 7,110
Cash/Accrual Interest Income Recognized, Total | 86 | 95 | 58
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 6,210 | 2,219 | 6,428
Recorded Investment With no recorded allowance | 6,256 | 2,218 | 6,442
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 3,696 | 2,900 | 6,699
Cash/Accrual Interest Income Recognized, With no recorded allowance | 40 | 93 | 37
Unpaid Principal Balance With an allowance recorded | 931 | 31 | 577
Recorded Investment With an allowance recorded | 931 | 32 | 577
Allowance For Loan Loss Allocated | 184 | 4 | 202
Average Balance in Impaired Loans With an allowance recorded | 78 | 5 | 411
Cash/Accrual Interest Income Recognized, With an allowance recorded | 46 | 2 | 21
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 3,824 | 1,533 | 1,340
Recorded Investment With no recorded allowance | 3,849 | 1,533 | 1,339
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,673 | 1,619 | 1,001
Cash/Accrual Interest Income Recognized, With no recorded allowance | 11 | 58 | 22
Unpaid Principal Balance With an allowance recorded | 931 |  | 410
Recorded Investment With an allowance recorded | 931 |  | 410
Allowance For Loan Loss Allocated | 184 |  | 105
Average Balance in Impaired Loans With an allowance recorded | 78 |  | 243
Cash/Accrual Interest Income Recognized, With an allowance recorded | 46 |  | 8
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 554 | 440 | 4,938
Recorded Investment With no recorded allowance | 570 | 440 | 4,953
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 345 | 871 | 5,417
Cash/Accrual Interest Income Recognized, With no recorded allowance |  | 18 | 8
Unpaid Principal Balance With an allowance recorded |  |  | 70
Recorded Investment With an allowance recorded |  |  | 70
Allowance For Loan Loss Allocated |  |  | 32
Average Balance in Impaired Loans With an allowance recorded |  |  | 6
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |  | 13
Commercial [Member] | Residential Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Commercial [Member] | Development & Spec Land Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 176 | 118 | 71
Recorded Investment With no recorded allowance | 174 | 118 | 71
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 233 | 61 | 6
Cash/Accrual Interest Income Recognized, With no recorded allowance | 4 | 16 | 3
Commercial [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 1,656 | 128 | 79
Recorded Investment With no recorded allowance | 1,663 | 127 | 79
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,445 | 349 | 275
Cash/Accrual Interest Income Recognized, With no recorded allowance | $ 25 | 1 | 4
Unpaid Principal Balance With an allowance recorded |  | 31 | 97
Recorded Investment With an allowance recorded |  | 32 | 97
Allowance For Loan Loss Allocated |  | 4 | 65
Average Balance in Impaired Loans With an allowance recorded |  | 5 | $ 162
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | $ 2 |

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