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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