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Non-performing Assets and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance total | $ 7,005 | $ 11,053 | $ 7,426
Total ending loans balance | 7,019 | 11,055 | 7,448
Allowance For Loan Loss Allocated | 202 | 1,589 | 1,312
Average Balance in Impaired Loans total | 7,110 | 5,277 | 7,336
Cash/Accrual Interest Income Recognized, Total | 58 | 379 | 271
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 6,428 | 3,216 | 5,227
Recorded Investment With no recorded allowance | 6,442 | 3,218 | 5,249
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 6,699 | 2,343 | 5,545
Cash/Accrual Interest Income Recognized, With no recorded allowance | 37 | 143 | 240
Unpaid Principal Balance With an allowance recorded | 577 | 7,837 | 2,199
Recorded Investment With an allowance recorded | 577 | 7,837 | 2,199
Allowance For Loan Loss Allocated | 202 | 1,589 | 1,312
Average Balance in Impaired Loans With an allowance recorded | 411 | 2,934 | 1,791
Cash/Accrual Interest Income Recognized, With an allowance recorded | 21 | 236 | 31
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 1,340 | 1,169 | 1,293
Recorded Investment With no recorded allowance | 1,339 | 1,170 | 1,296
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,001 | 645 | 1,845
Cash/Accrual Interest Income Recognized, With no recorded allowance | 22 | 65 | 68
Unpaid Principal Balance With an allowance recorded | 410 | 422 |
Recorded Investment With an allowance recorded | 410 | 422 |
Allowance For Loan Loss Allocated | 105 | 165 |
Average Balance in Impaired Loans With an allowance recorded | 243 | 141 |
Cash/Accrual Interest Income Recognized, With an allowance recorded | 8 | 16 |
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 4,938 | 1,193 | 3,521
Recorded Investment With no recorded allowance | 4,953 | 1,194 | 3,525
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 5,417 | 1,341 | 2,963
Cash/Accrual Interest Income Recognized, With no recorded allowance | 8 | 51 | 172
Unpaid Principal Balance With an allowance recorded | 70 | 6,453 | 403
Recorded Investment With an allowance recorded | 70 | 6,453 | 403
Allowance For Loan Loss Allocated | 32 | 744 | 202
Average Balance in Impaired Loans With an allowance recorded | 6 | 1,995 | 485
Cash/Accrual Interest Income Recognized, With an allowance recorded | 13 | 208 |
Commercial [Member] | Residential Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Commercial [Member] | Development & Spec Land Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 71 |  | 23
Recorded Investment With no recorded allowance | 71 |  | 23
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 6 |  | 25
Cash/Accrual Interest Income Recognized, With no recorded allowance | 3 |  |
Unpaid Principal Balance With an allowance recorded |  |  | 159
Recorded Investment With an allowance recorded |  |  | 159
Allowance For Loan Loss Allocated |  |  | 48
Average Balance in Impaired Loans With an allowance recorded |  |  | 166
Commercial [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Unpaid Principal Balance With no recorded allowance | 79 | 854 | 390
Recorded Investment With no recorded allowance | 79 | 854 | 405
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 275 | 357 | 712
Cash/Accrual Interest Income Recognized, With no recorded allowance | 4 | 27 |
Unpaid Principal Balance With an allowance recorded | 97 | 962 | 1,637
Recorded Investment With an allowance recorded | 97 | 962 | 1,637
Allowance For Loan Loss Allocated | 65 | 680 | 1,062
Average Balance in Impaired Loans With an allowance recorded | $ 162 | 798 | 1,140
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | $ 12 | $ 31

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