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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance total | $ 3,433 | $ 5,840 | $ 3,433 | $ 5,840
Total ending loans balance | 3,451 | 5,855 | 3,451 | 5,855
Allowance For Loan Loss Allocated | 0 | 0 | 0 | 0
Average Balance in Impaired Loans total | 3,923 | 6,163 | 2,642 | 5,716
Cash/Accrual Interest Income Recognized, Total |  | 1 | 25 | 3
Commercial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 3,433 | 5,840 | 3,433 | 5,840
Recorded Investment With no recorded allowance | 3,451 | 5,855 | 3,451 | 5,855
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 3,923 | 6,163 | 2,642 | 5,716
Cash/Accrual Interest Income Recognized, With no recorded allowance | 7 | 1 | 25 | 3
Unpaid Principal Balance With an allowance recorded | 0 | 0 | 0 | 0
Recorded Investment With an allowance recorded | 0 | 0 | 0 | 0
Allowance For Loan Loss Allocated | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With an allowance recorded | 0 | 0 | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 | 0
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 923 | 994 | 923 | 994
Recorded Investment With no recorded allowance | 934 | 995 | 934 | 995
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,167 | 1,029 | 1,033 | 1,062
Cash/Accrual Interest Income Recognized, With no recorded allowance | 4 |  | 4 |
Unpaid Principal Balance With an allowance recorded | 0 | 0 | 0 | 0
Recorded Investment With an allowance recorded | 0 | 0 | 0 | 0
Allowance For Loan Loss Allocated | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With an allowance recorded | 0 | 0 | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 | 0
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 701 | 3,106 | 701 | 3,106
Recorded Investment With no recorded allowance | 701 | 3,120 | 701 | 3,120
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 468 | 3,150 | 308 | 3,776
Cash/Accrual Interest Income Recognized, With no recorded allowance |  | 1 | 2 | 3
Unpaid Principal Balance With an allowance recorded | 0 | 0 | 0 | 0
Recorded Investment With an allowance recorded | 0 | 0 | 0 | 0
Allowance For Loan Loss Allocated | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With an allowance recorded | 0 | 0 | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 | 0
Commercial [Member] | Residential Development [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Unpaid Principal Balance With an allowance recorded | 0 | 0 | 0 | 0
Recorded Investment With an allowance recorded | 0 | 0 | 0 | 0
Allowance For Loan Loss Allocated | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With an allowance recorded | 0 | 0 | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 | 0
Commercial [Member] | Development & Spec Land Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 102 |  | 102 |
Recorded Investment With no recorded allowance | 102 |  | 102 |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 222 |  | 230 |
Unpaid Principal Balance With an allowance recorded | 0 | 0 | 0 | 0
Recorded Investment With an allowance recorded | 0 | 0 | 0 | 0
Allowance For Loan Loss Allocated | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With an allowance recorded | 0 | 0 | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 | 0
Commercial [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 1,707 | 1,740 | 1,707 | 1,740
Recorded Investment With no recorded allowance | 1,714 | 1,740 | 1,714 | 1,740
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 2,066 | 1,984 | 1,071 | 878
Cash/Accrual Interest Income Recognized, With no recorded allowance | 3 |  | 19 |
Unpaid Principal Balance With an allowance recorded | 0 | 0 | 0 | 0
Recorded Investment With an allowance recorded | 0 | 0 | 0 | 0
Allowance For Loan Loss Allocated | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With an allowance recorded | 0 | 0 | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 0 | $ 0 | $ 0 | $ 0

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