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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
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance total | $ 1,379 | $ 5,773
Total ending loans balance | 1,379 | 5,788
Allowance For Loan Loss Allocated |  | 900
Average Balance in Impaired Loans total | 2,002 | 6,266
Cash/Accrual Interest Income Recognized, Total |  | 1
Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 1,379 | 3,016
Recorded Investment With no recorded allowance | 1,379 | 3,021
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 2,002 | 3,499
Cash/Accrual Interest Income Recognized, With no recorded allowance |  | 1
Unpaid Principal Balance With an allowance recorded |  | 2,757
Recorded Investment With an allowance recorded |  | 2,767
Allowance For Loan Loss Allocated |  | 900
Average Balance in Impaired Loans With an allowance recorded |  | 2,767
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 759 | 1,089
Recorded Investment With no recorded allowance | 759 | 1,089
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,021 | 1,106
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 387 | 1,851
Recorded Investment With no recorded allowance | 387 | 1,856
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 393 | 2,063
Cash/Accrual Interest Income Recognized, With no recorded allowance |  | 1
Unpaid Principal Balance With an allowance recorded |  | 2,757
Recorded Investment With an allowance recorded |  | 2,767
Allowance For Loan Loss Allocated |  | 900
Average Balance in Impaired Loans With an allowance recorded |  | 2,767
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0
Commercial [Member] | Residential Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 112 |
Recorded Investment With no recorded allowance | 112 |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 238 |
Cash/Accrual Interest Income Recognized, With an allowance recorded | 0 | 0
Commercial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 121 | 76
Recorded Investment With no recorded allowance | 121 | 76
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 350 | 330
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 0 | $ 0

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