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Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Schedule Of Financial Receivables [Line Items] |  |  |  |
Unpaid Principal Balance total | $ 8,491 | $ 7,887 | $ 8,491 | $ 7,887
Total ending loans balance | 8,497 | 7,919 | 8,497 | 7,919
Allowance For Loan Loss Allocated | 1,175 | 1,316 | 1,175 | 1,316
Average Balance in Impaired Loans total | 8,051 | 10,136 | 7,416 | 9,794
Cash/Accrual Interest Income Recognized, Total | 128 | 24 | 278 | 87
Commercial [Member] |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 6,364 | 5,063 | 6,364 | 5,063
Recorded Investment With no recorded allowance | 6,370 | 5,083 | 6,370 | 5,083
Allowance For Loan Loss Allocated With no recorded allowance |  |  |  |
Average Balance in Impaired Loans With no recorded allowance | 5,750 | 7,094 | 5,232 | 7,319
Cash/Accrual Interest Income Recognized, With no recorded allowance | 128 | 24 | 270 | 64
Unpaid Principal Balance With an allowance recorded | 2,127 | 2,824 | 2,127 | 2,824
Recorded Investment With an allowance recorded | 2,127 | 2,836 | 2,127 | 2,836
Allowance For Loan Loss Allocated | 1,175 | 1,316 | 1,175 | 1,316
Average Balance in Impaired Loans With an allowance recorded | 2,301 | 3,042 | 2,184 | 2,475
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |  | 8 | 23
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 2,851 | 1,329 | 2,851 | 1,329
Recorded Investment With no recorded allowance | 2,854 | 1,331 | 2,854 | 1,331
Allowance For Loan Loss Allocated With no recorded allowance |  |  |  |
Average Balance in Impaired Loans With no recorded allowance | 2,126 | 1,959 | 1,525 | 2,685
Cash/Accrual Interest Income Recognized, With no recorded allowance | 85 | 16 | 129 | 43
Unpaid Principal Balance With an allowance recorded | 403 |  | 403 |
Recorded Investment With an allowance recorded | 403 |  | 403 |
Allowance For Loan Loss Allocated | 13 |  | 13 |
Average Balance in Impaired Loans With an allowance recorded | 406 | (1) | 274 |
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |  | 6 |
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 3,232 | 3,167 | 3,232 | 3,167
Recorded Investment With no recorded allowance | 3,235 | 3,170 | 3,235 | 3,170
Allowance For Loan Loss Allocated With no recorded allowance |  |  |  |
Average Balance in Impaired Loans With no recorded allowance | 3,257 | 3,814 | 3,274 | 3,298
Cash/Accrual Interest Income Recognized, With no recorded allowance | 43 | 8 | 141 | 23
Unpaid Principal Balance With an allowance recorded | 333 | 487 | 333 | 487
Recorded Investment With an allowance recorded | 333 | 487 | 333 | 487
Allowance For Loan Loss Allocated | 150 | 302 | 150 | 302
Average Balance in Impaired Loans With an allowance recorded | 335 | 491 | 343 | 502
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 |  | 21 |  | 21
Recorded Investment With no recorded allowance |  | 21 |  | 21
Allowance For Loan Loss Allocated With no recorded allowance |  |  |  |
Average Balance in Impaired Loans With no recorded allowance |  | 24 |  | 25
Cash/Accrual Interest Income Recognized, With no recorded allowance |  |  |  |
Unpaid Principal Balance With an allowance recorded |  | 149 |  | 149
Recorded Investment With an allowance recorded |  | 149 |  | 149
Allowance For Loan Loss Allocated |  | 48 |  | 48
Average Balance in Impaired Loans With an allowance recorded |  | 173 |  | 165
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 | 281 | 546 | 281 | 546
Recorded Investment With no recorded allowance | 281 | 561 | 281 | 561
Allowance For Loan Loss Allocated With no recorded allowance |  |  |  |
Average Balance in Impaired Loans With no recorded allowance | 367 | 1,297 | 433 | 1,311
Cash/Accrual Interest Income Recognized, With no recorded allowance | 0 |  | 0 |
Unpaid Principal Balance With an allowance recorded | 1,391 | 2,188 | 1,391 | 2,188
Recorded Investment With an allowance recorded | 1,391 | 2,200 | 1,391 | 2,200
Allowance For Loan Loss Allocated | 1,012 | 966 | 1,012 | 966
Average Balance in Impaired Loans With an allowance recorded | 1,560 | 2,379 | 1,567 | 1,808
Cash/Accrual Interest Income Recognized, With an allowance recorded |  |  | $ 2 | $ 23

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