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Non-performing Assets and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Schedule Of Financial Receivables [Line Items] |  |
Unpaid Principal Balance total | $ 7,313 | $ 10,054
Total ending loans balance | 7,335 | 10,078
Allowance For Loan Loss Allocated | 1,290 | 1,945
Average Balance in Impaired Loans total | 8,126 | 13,879
Cash/Accrual Interest Income Recognized, Total | 19 | 25
Commercial [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 4,945 | 6,935
Recorded Investment With no recorded allowance | 4,967 | 6,959
Allowance For Loan Loss Allocated With no recorded allowance |  |
Average Balance in Impaired Loans With no recorded allowance | 5,905 | 10,742
Cash/Accrual Interest Income Recognized, With no recorded allowance | 17 | 25
Unpaid Principal Balance With an allowance recorded | 2,368 | 3,119
Recorded Investment With an allowance recorded | 2,368 | 3,119
Allowance For Loan Loss Allocated | 1,290 | 1,945
Average Balance in Impaired Loans With an allowance recorded | 2,221 | 3,137
Cash/Accrual Interest Income Recognized, With an allowance recorded | 2 |
Commercial [Member] | Owner Occupied Real Estate [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 1,145 | 3,310
Recorded Investment With no recorded allowance | 1,148 | 3,317
Allowance For Loan Loss Allocated With no recorded allowance |  |
Average Balance in Impaired Loans With no recorded allowance | 1,759 | 4,906
Cash/Accrual Interest Income Recognized, With no recorded allowance | 12 | 14
Unpaid Principal Balance With an allowance recorded |  |
Recorded Investment With an allowance recorded |  |
Allowance For Loan Loss Allocated |  |
Average Balance in Impaired Loans With an allowance recorded | (1) |
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |
Commercial [Member] | Non-owner Occupied Real Estate [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 3,443 | 2,578
Recorded Investment With no recorded allowance | 3,446 | 2,579
Allowance For Loan Loss Allocated With no recorded allowance |  |
Average Balance in Impaired Loans With no recorded allowance | 3,514 | 3,793
Cash/Accrual Interest Income Recognized, With no recorded allowance | 5 | 11
Unpaid Principal Balance With an allowance recorded | 347 | 1,763
Recorded Investment With an allowance recorded | 347 | 1,763
Allowance For Loan Loss Allocated | 170 | 1,080
Average Balance in Impaired Loans With an allowance recorded | 353 | 1,774
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |
Commercial [Member] | Residential Development [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Unpaid Principal Balance With no recorded allowance |  |
Recorded Investment With no recorded allowance |  |
Allowance For Loan Loss Allocated With no recorded allowance |  |
Average Balance in Impaired Loans With no recorded allowance |  |
Cash/Accrual Interest Income Recognized, With no recorded allowance |  |
Unpaid Principal Balance With an allowance recorded |  |
Recorded Investment With an allowance recorded |  |
Allowance For Loan Loss Allocated |  |
Average Balance in Impaired Loans With an allowance recorded |  |
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |
Commercial [Member] | Development & Spec Land Loans [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 24 | 135
Recorded Investment With no recorded allowance | 24 | 135
Allowance For Loan Loss Allocated With no recorded allowance |  |
Average Balance in Impaired Loans With no recorded allowance | 24 | 166
Cash/Accrual Interest Income Recognized, With no recorded allowance |  |
Unpaid Principal Balance With an allowance recorded | 138 | 564
Recorded Investment With an allowance recorded | 138 | 564
Allowance For Loan Loss Allocated | 40 | 600
Average Balance in Impaired Loans With an allowance recorded | 142 | 569
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |
Commercial [Member] | Commercial and Industrial [Member] |  |
Schedule Of Financial Receivables [Line Items] |  |
Unpaid Principal Balance With no recorded allowance | 333 | 912
Recorded Investment With no recorded allowance | 349 | 928
Allowance For Loan Loss Allocated With no recorded allowance |  |
Average Balance in Impaired Loans With no recorded allowance | 608 | 1,877
Cash/Accrual Interest Income Recognized, With no recorded allowance |  |
Unpaid Principal Balance With an allowance recorded | 1,883 | 792
Recorded Investment With an allowance recorded | 1,883 | 792
Allowance For Loan Loss Allocated | 1,080 | 265
Average Balance in Impaired Loans With an allowance recorded | 1,727 | 794
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 2 |

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