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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 | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule Of Financial Receivables [Line Items] |  |  |
Unpaid Principal Balance total | $ 7,426 | $ 10,597 | $ 7,958
Total ending loans balance | 7,448 | 10,627 | 7,960
Allowance For Loan Loss Allocated | 1,312 | 1,945 | 2,136
Average Balance in Impaired Loans total | 7,336 | 6,137 | 4,841
Cash/Accrual Interest Income Recognized, Total | 271 | 201 | 181
Commercial [Member] |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 5,227 | 7,433 | 1,632
Recorded Investment With no recorded allowance | 5,249 | 7,463 | 1,634
Allowance For Loan Loss Allocated With no recorded allowance |  |  |
Average Balance in Impaired Loans With no recorded allowance | 5,545 | 4,324 | 1,261
Cash/Accrual Interest Income Recognized, With no recorded allowance | 240 | 100 | 51
Unpaid Principal Balance With an allowance recorded | 2,199 | 3,164 | 6,326
Recorded Investment With an allowance recorded | 2,199 | 3,164 | 6,326
Allowance For Loan Loss Allocated | 1,312 | 1,945 | 2,136
Average Balance in Impaired Loans With an allowance recorded | 1,791 | 1,813 | 3,580
Cash/Accrual Interest Income Recognized, With an allowance recorded | 31 | 101 | 130
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 1,293 | 4,890 | 192
Recorded Investment With no recorded allowance | 1,296 | 4,901 | 192
Allowance For Loan Loss Allocated With no recorded allowance |  |  |
Average Balance in Impaired Loans With no recorded allowance | 1,845 | 2,422 | 110
Cash/Accrual Interest Income Recognized, With no recorded allowance | 68 | 80 | 2
Unpaid Principal Balance With an allowance recorded |  |  | 2,323
Recorded Investment With an allowance recorded |  |  | 2,323
Allowance For Loan Loss Allocated |  |  | 770
Average Balance in Impaired Loans With an allowance recorded |  |  | 1,911
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |  | 25
Commercial [Member] | Non-owner Occupied Real Estate [Member] |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 3,521 | 1,961 | 954
Recorded Investment With no recorded allowance | 3,525 | 1,963 | 956
Allowance For Loan Loss Allocated With no recorded allowance |  |  |
Average Balance in Impaired Loans With no recorded allowance | 2,963 | 1,544 | 639
Cash/Accrual Interest Income Recognized, With no recorded allowance | 172 | 20 | 43
Unpaid Principal Balance With an allowance recorded | 403 | 1,795 | 3,168
Recorded Investment With an allowance recorded | 403 | 1,795 | 3,168
Allowance For Loan Loss Allocated | 202 | 1,080 | 1,080
Average Balance in Impaired Loans With an allowance recorded | 485 | 481 | 830
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | 95 | 83
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 | 23 | 133 | 90
Recorded Investment With no recorded allowance | 23 | 133 | 90
Allowance For Loan Loss Allocated With no recorded allowance |  |  |
Average Balance in Impaired Loans With no recorded allowance | 25 | 61 | 157
Cash/Accrual Interest Income Recognized, With no recorded allowance |  |  |
Unpaid Principal Balance With an allowance recorded | 159 | 572 |
Recorded Investment With an allowance recorded | 159 | 572 |
Allowance For Loan Loss Allocated | 48 | 600 |
Average Balance in Impaired Loans With an allowance recorded | 166 | 526 |
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | 6 |
Commercial [Member] | Commercial and Industrial [Member] |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 390 | 449 | 396
Recorded Investment With no recorded allowance | 405 | 466 | 396
Allowance For Loan Loss Allocated With no recorded allowance |  |  |
Average Balance in Impaired Loans With no recorded allowance | 712 | 297 | 355
Cash/Accrual Interest Income Recognized, With no recorded allowance |  |  | 6
Unpaid Principal Balance With an allowance recorded | 1,637 | 797 | 835
Recorded Investment With an allowance recorded | 1,637 | 797 | 835
Allowance For Loan Loss Allocated | 1,062 | 265 | 286
Average Balance in Impaired Loans With an allowance recorded | 1,140 | 806 | 839
Cash/Accrual Interest Income Recognized, With an allowance recorded | $ 31 |  | $ 22

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