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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance total | $ 4,330 | $ 10,269 | $ 4,330 | $ 10,269
Total ending loans balance | 4,344 | 10,274 | 4,344 | 10,274
Allowance For Loan Loss Allocated | 500 | 1,291 | 500 | 1,291
Average Balance in Impaired Loans total | 4,729 | 12,121 | 5,492 | 9,543
Cash/Accrual Interest Income Recognized, Total | 1 | 78 | 2 | 85
Commercial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 1,601 | 4,804 | 1,601 | 4,804
Recorded Investment With no recorded allowance | 1,605 | 4,809 | 1,605 | 4,809
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,982 | 5,157 | 2,735 | 4,987
Cash/Accrual Interest Income Recognized, With no recorded allowance | 1 | 24 | 2 | 31
Unpaid Principal Balance With an allowance recorded | 2,729 | 5,465 | 2,729 | 5,465
Recorded Investment With an allowance recorded | 2,739 | 5,465 | 2,739 | 5,465
Allowance For Loan Loss Allocated | 500 | 1,291 | 500 | 1,291
Average Balance in Impaired Loans With an allowance recorded | 2,747 | 6,964 | 2,757 | 4,556
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | 54 |  | 54
Commercial [Member] | Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 1,054 | 1,605 | 1,054 | 1,605
Recorded Investment With no recorded allowance | 1,054 | 1,606 | 1,054 | 1,606
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 1,062 | 1,350 | 1,079 | 1,118
Cash/Accrual Interest Income Recognized, With no recorded allowance |  | 17 |  | 17
Unpaid Principal Balance With an allowance recorded |  | 2,991 |  | 2,991
Recorded Investment With an allowance recorded |  | 2,991 |  | 2,991
Allowance For Loan Loss Allocated |  | 593 |  | 593
Average Balance in Impaired Loans With an allowance recorded |  | 4,366 |  | 1,992
Cash/Accrual Interest Income Recognized, With an allowance recorded |  | 54 |  | 54
Commercial [Member] | Non Owner Occupied Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 476 | 2,820 | 476 | 2,820
Recorded Investment With no recorded allowance | 480 | 2,824 | 480 | 2,824
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | 600 | 3,168 | 1,331 | 3,270
Cash/Accrual Interest Income Recognized, With no recorded allowance | 1 | 7 | 2 | 14
Unpaid Principal Balance With an allowance recorded | 2,729 | 1,590 | 2,729 | 1,590
Recorded Investment With an allowance recorded | 2,739 | 1,590 | 2,739 | 1,590
Allowance For Loan Loss Allocated | 500 | 200 | 500 | 200
Average Balance in Impaired Loans With an allowance recorded | 2,747 | 1,590 | 2,757 | 1,590
Commercial [Member] | Residential Development [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 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 | 0 | 0
Commercial [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Unpaid Principal Balance With no recorded allowance | 71 | 379 | 71 | 379
Recorded Investment With no recorded allowance | 71 | 379 | 71 | 379
Allowance For Loan Loss Allocated With no recorded allowance | 0 | 0 | 0 | 0
Average Balance in Impaired Loans With no recorded allowance | $ 320 | 639 | $ 325 | 599
Unpaid Principal Balance With an allowance recorded |  | 884 |  | 884
Recorded Investment With an allowance recorded |  | 884 |  | 884
Allowance For Loan Loss Allocated |  | 498 |  | 498
Average Balance in Impaired Loans With an allowance recorded |  | $ 1,008 |  | $ 974

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