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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, 2016 | Mar. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance total | $ 5,773 | $ 8,541
Total ending loans balance | 5,788 | 8,547
Allowance For Loan Loss Allocated | 900 | 1,029
Average Balance in Impaired Loans total | 6,266 | 9,470
Cash/Accrual Interest Income Recognized, Total | 1 | 8
Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 3,016 | 5,592
Recorded Investment With no recorded allowance | 3,021 | 5,598
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 3,499 | 6,512
Cash/Accrual Interest Income Recognized, With no recorded allowance | 1 | 8
Unpaid Principal Balance With an allowance recorded | 2,757 | 2,949
Recorded Investment With an allowance recorded | 2,767 | 2,949
Allowance For Loan Loss Allocated | 900 | 1,029
Average Balance in Impaired Loans With an allowance recorded | 2,767 | 2,958
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 | 1,089 | 1,076
Recorded Investment With no recorded allowance | 1,089 | 1,077
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,106 | 1,329
Cash/Accrual Interest Income Recognized, With no recorded allowance |  | 2
Unpaid Principal Balance With an allowance recorded |  | 417
Recorded Investment With an allowance recorded |  | 417
Allowance For Loan Loss Allocated |  | 165
Average Balance in Impaired Loans With an allowance recorded |  | 419
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 | 1,851 | 3,907
Recorded Investment With no recorded allowance | 1,856 | 3,912
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 2,063 | 4,534
Cash/Accrual Interest Income Recognized, With no recorded allowance | 1 | 6
Unpaid Principal Balance With an allowance recorded | 2,757 | 1,590
Recorded Investment With an allowance recorded | 2,767 | 1,590
Allowance For Loan Loss Allocated | 900 | 184
Average Balance in Impaired Loans With an allowance recorded | 2,767 | 1,590
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] |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
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 | 76 | 609
Recorded Investment With no recorded allowance | 76 | 609
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 330 | 649
Unpaid Principal Balance With an allowance recorded |  | 942
Recorded Investment With an allowance recorded |  | 942
Allowance For Loan Loss Allocated |  | 680
Average Balance in Impaired Loans With an allowance recorded |  | 949
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 0 | $ 0

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