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Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance total | $ 6,220 | $ 6,777
Total ending loans balance | 6,233 | 6,824
Allowance For Loan Loss Allocated | 915 | 184
Average Balance in Impaired Loans total | 6,644 | 7,987
Cash/Accrual Interest Income Recognized, Total | 102 | 42
Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 5,098 | 5,884
Recorded Investment With no recorded allowance | 5,111 | 5,931
Average Balance in Impaired Loans With no recorded allowance | 5,519 | 7,087
Cash/Accrual Interest Income Recognized, With no recorded allowance | 102 | 42
Unpaid Principal Balance With an allowance recorded | 1,122 |
Recorded Investment With an allowance recorded | 1,122 |
Allowance For Loan Loss Allocated | 915 |
Average Balance in Impaired Loans With an allowance recorded | 1,125 |
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 3,275 | 4,038
Recorded Investment With no recorded allowance | 3,269 | 4,063
Average Balance in Impaired Loans With no recorded allowance | 3,650 | 4,590
Cash/Accrual Interest Income Recognized, With no recorded allowance | 60 | 37
Unpaid Principal Balance With an allowance recorded | 355 | 893
Recorded Investment With an allowance recorded | 355 | 893
Allowance For Loan Loss Allocated | 25 | 184
Average Balance in Impaired Loans With an allowance recorded | 358 | 900
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 840 | 1,033
Recorded Investment With no recorded allowance | 869 | 1,049
Average Balance in Impaired Loans With no recorded allowance | 875 | 975
Cash/Accrual Interest Income Recognized, With no recorded allowance | 32 | 5
Unpaid Principal Balance With an allowance recorded | 135 |
Recorded Investment With an allowance recorded | 135 |
Allowance For Loan Loss Allocated | 40 |
Average Balance in Impaired Loans With an allowance recorded | 135 |
Commercial [Member] | Development & Spec Land [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 66 | 76
Recorded Investment With no recorded allowance | 64 | 74
Average Balance in Impaired Loans With no recorded allowance | 65 | 75
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 656 | 737
Recorded Investment With no recorded allowance | 648 | 745
Average Balance in Impaired Loans With no recorded allowance | 668 | 1,447
Cash/Accrual Interest Income Recognized, With no recorded allowance | 7 | 0
Unpaid Principal Balance With an allowance recorded | 632 | 893
Recorded Investment With an allowance recorded | 632 | 893
Allowance For Loan Loss Allocated | 850 | 184
Average Balance in Impaired Loans With an allowance recorded | 632 | $ 900
Commercial [Member] | Residential Spec Homes [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 261 |
Recorded Investment With no recorded allowance | 261 |
Average Balance in Impaired Loans With no recorded allowance | 261 |
Cash/Accrual Interest Income Recognized, With no recorded allowance | $ 3 |

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