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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance total | $ 8,988 | $ 3,639 | $ 8,988 | $ 3,639
Total ending loans balance | 8,999 | 3,640 | 8,999 | 3,640
Allowance For Loan Loss Allocated | 184 |  | 184 |
Average Balance in Impaired Loans total | 9,720 | 3,262 | 9,706 | 2,518
Cash/Accrual Interest Income Recognized, Total | 71 | 40 | 113 | 40
Commercial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 8,124 | 3,639 | 8,124 | 3,639
Recorded Investment With no recorded allowance | 8,135 | 3,640 | 8,135 | 3,640
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 8,849 | 3,262 | 8,821 | 2,518
Cash/Accrual Interest Income Recognized, With no recorded allowance | 71 | 40 | 113 | 40
Unpaid Principal Balance With an allowance recorded | 864 |  | 864 |
Recorded Investment With an allowance recorded | 864 |  | 864 |
Allowance For Loan Loss Allocated | 184 |  | 184 |
Average Balance in Impaired Loans With an allowance recorded | 871 |  | 885 |
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 | 4,765 | 1,591 | 4,765 | 1,591
Recorded Investment With no recorded allowance | 4,762 | 1,592 | 4,762 | 1,592
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 5,271 | 1,538 | 5,303 | 1,233
Cash/Accrual Interest Income Recognized, With no recorded allowance | 59 | 22 | 96 | 22
Unpaid Principal Balance With an allowance recorded | 864 |  | 864 |
Recorded Investment With an allowance recorded | 864 |  | 864 |
Allowance For Loan Loss Allocated | 184 |  | 184 |
Average Balance in Impaired Loans With an allowance recorded | 871 |  | 885 |
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 | 1,344 | 467 | 1,344 | 467
Recorded Investment With no recorded allowance | 1,360 | 467 | 1,360 | 467
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,591 | 471 | 1,559 | 432
Cash/Accrual Interest Income Recognized, With no recorded allowance | 5 | 2 | 10 | 2
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 | 0
Commercial [Member] | Residential Spec Homes [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0 | 0 | 0
Commercial [Member] | Development & Spec Land [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 72 | 107 | 72 | 107
Recorded Investment With no recorded allowance | 70 | 107 | 70 | 107
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 71 | 230 | 73 | 234
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 | 1,943 | 1,474 | 1,943 | 1,474
Recorded Investment With no recorded allowance | 1,943 | 1,474 | 1,943 | 1,474
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,916 | 1,023 | 1,886 | 619
Cash/Accrual Interest Income Recognized, With no recorded allowance | 7 | 16 | 7 | 16
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 0 | $ 0 | $ 0 | $ 0

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