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Loans and Allowance for Loan Losses - Schedule of Impaired Loans and Related Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance $ 38,379 $ 35,030
Recorded Investment With No Allowance 7,657 6,546
Recorded Investment With Allowance 19,714 22,055
Total Recorded Investment 27,371 28,601
Related Allowance 5,012 5,071
12 Month Average Recorded Investment 22,055 21,735
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 13,389 10,056
Recorded Investment With No Allowance 1,148 608
Recorded Investment With Allowance 6,136 8,153
Total Recorded Investment 7,284 8,761
Related Allowance 2,128 2,030
12 Month Average Recorded Investment 4,921 5,812
Agriculture [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 103 97
Recorded Investment With Allowance 99 97
Total Recorded Investment 99 97
Related Allowance 25 70
12 Month Average Recorded Investment 50 48
Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 23,466 23,710
Recorded Investment With No Allowance 6,229 5,314
Recorded Investment With Allowance 12,525 13,452
Total Recorded Investment 18,754 18,766
Related Allowance 2,428 2,827
12 Month Average Recorded Investment 16,170 15,211
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Contractual Principal Balance 1,421 1,167
Recorded Investment With No Allowance 280 624
Recorded Investment With Allowance 954 353
Total Recorded Investment 1,234 977
Related Allowance 431 144
12 Month Average Recorded Investment $ 914 $ 664