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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance total | $ 6,696 | $ 7,141 | $ 2,250
Total ending loans balance | 6,708 | 7,187 | 2,250
Allowance For Loan Loss Allocated | 1,035 | 184 | 4
Average Balance in Impaired Loans total | 7,368 | 3,774 | 2,905
Cash/Accrual Interest Income Recognized, Total | 128 | 86 | 95
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 4,968 | 6,210 | 2,219
Recorded Investment With no recorded allowance | 4,980 | 6,256 | 2,218
Average Balance in Impaired Loans With no recorded allowance | 5,454 | 3,696 | 2,900
Cash/Accrual Interest Income Recognized, With no recorded allowance | 110 | 40 | 93
Unpaid Principal Balance With an allowance recorded | 1,728 | 931 | 31
Recorded Investment With an allowance recorded | 1,728 | 931 | 32
Allowance For Loan Loss Allocated | 1,035 | 184 | 4
Average Balance in Impaired Loans With an allowance recorded | 1,914 | 78 | 5
Cash/Accrual Interest Income Recognized, With an allowance recorded | 18 | 46 | 2
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 2,696 | 3,824 | 1,533
Recorded Investment With no recorded allowance | 2,689 | 3,849 | 1,533
Average Balance in Impaired Loans With no recorded allowance | 3,048 | 1,673 | 1,619
Cash/Accrual Interest Income Recognized, With no recorded allowance | 71 | 11 | 58
Unpaid Principal Balance With an allowance recorded | 827 | 931 |
Recorded Investment With an allowance recorded | 828 | 931 |
Allowance For Loan Loss Allocated | 145 | 184 |
Average Balance in Impaired Loans With an allowance recorded | 864 | 78 |
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | 46 |
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 860 | 554 | 440
Recorded Investment With no recorded allowance | 888 | 570 | 440
Average Balance in Impaired Loans With no recorded allowance | 1,096 | 345 | 871
Cash/Accrual Interest Income Recognized, With no recorded allowance | 12 |  | 18
Unpaid Principal Balance With an allowance recorded | 186 |  |
Recorded Investment With an allowance recorded | 186 |  |
Allowance For Loan Loss Allocated | 30 |  |
Average Balance in Impaired Loans With an allowance recorded | 180 |  |
Cash/Accrual Interest Income Recognized, With an allowance recorded | 4 |  |
Commercial [Member] | Development & Spec Land [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 68 | 176 | 118
Recorded Investment With no recorded allowance | 66 | 174 | 118
Average Balance in Impaired Loans With no recorded allowance | 71 | 233 | 61
Cash/Accrual Interest Income Recognized, With no recorded allowance |  | 4 | 16
Commercial [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 1,344 | 1,656 | 128
Recorded Investment With no recorded allowance | 1,337 | 1,663 | 127
Average Balance in Impaired Loans With no recorded allowance | 1,239 | 1,445 | 349
Cash/Accrual Interest Income Recognized, With no recorded allowance | 27 | 25 | 1
Unpaid Principal Balance With an allowance recorded | 715 |  | 31
Recorded Investment With an allowance recorded | 714 |  | 32
Allowance For Loan Loss Allocated | 860 |  | 4
Average Balance in Impaired Loans With an allowance recorded | 870 | $ 0 | 5
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 14 |  | $ 2

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