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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance $ 7,953 $ 9,495 $ 10,568
Recorded Investment With No Allowance 3,326 7,469 7,724
Recorded Investment With Allowance 3,847 1,262 1,495
Total Recorded Investment 7,173 8,731 9,219
Related Allowance 729 389 184
Average Recorded Investment 8,902 9,063 11,258
Interest Income Recognized 312 309 359
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 5,476 6,541 7,011
Recorded Investment With No Allowance 1,690 5,832 5,889
Recorded Investment With Allowance 3,354 301 37
Total Recorded Investment 5,044 6,133 5,926
Related Allowance 705 299  
Average Recorded Investment 6,609 5,972 6,739
Interest Income Recognized 241 230 208
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 796 1,265 1,836
Recorded Investment With No Allowance 600 670 950
Recorded Investment With Allowance 21 393 728
Total Recorded Investment 621 1,063 1,678
Related Allowance   64 109
Average Recorded Investment 786 1,420 2,723
Interest Income Recognized 10 18 90
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 1,681 1,689 1,721
Recorded Investment With No Allowance 1,036 967 885
Recorded Investment With Allowance 472 568 730
Total Recorded Investment 1,508 1,535 1,615
Related Allowance 24 26 75
Average Recorded Investment 1,507 1,671 1,796
Interest Income Recognized $ 61 $ 61 $ 61