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Loans - Schedule of Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance $ 9,832 $ 7,953 $ 9,495
Recorded Investment with no Allowance 5,565 3,326 7,469
Recorded Investment with Allowance 2,317 3,847 1,262
Total Recorded Investment 7,882 7,173 8,731
Related Allowance 244 729 389
Average Recorded Investment 7,573 8,902 9,063
Interest Income Recognized 123 312 309
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 3,352 5,476 6,541
Recorded Investment with no Allowance 1,329 1,690 5,832
Recorded Investment with Allowance 399 3,354 301
Total Recorded Investment 1,728 5,044 6,133
Related Allowance 74 705 299
Average Recorded Investment 2,884 6,609 5,972
Interest Income Recognized 52 241 230
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 4,826 796 1,265
Recorded Investment with no Allowance 3,117 600 670
Recorded Investment with Allowance 1,566 21 393
Total Recorded Investment 4,683 621 1,063
Related Allowance 151   64
Average Recorded Investment 3,213 786 1,420
Interest Income Recognized 14 10 18
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance 1,654 1,681 1,689
Recorded Investment with no Allowance 1,119 1,036 967
Recorded Investment with Allowance 352 472 568
Total Recorded Investment 1,471 1,508 1,535
Related Allowance 19 24 26
Average Recorded Investment 1,476 1,507 1,671
Interest Income Recognized $ 57 $ 61 $ 61