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Loans and Allowance for Loan Losses - Schedule of Impaired Loans and Related Allowance (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance $ 29,931 $ 46,207 $ 29,931 $ 46,207 $ 38,379
Recorded Investment With No Allowance 4,772 8,784 4,772 8,784 7,657
Recorded Investment With Allowance 16,717 30,120 16,717 30,120 19,714
Total Recorded Investment 21,489 38,904 21,489 38,904 27,371
Related Allowance 4,543 7,102 4,543 7,102 5,012
Average Recorded Investment 24,818 39,855 32,885 38,996 22,055
Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 9,362 19,571 9,362 19,571 13,389
Recorded Investment With No Allowance 708 1,103 708 1,103 1,148
Recorded Investment With Allowance 4,696 16,151 4,696 16,151 6,136
Total Recorded Investment 5,404 17,254 5,404 17,254 7,284
Related Allowance 1,683 4,144 1,683 4,144 2,128
Average Recorded Investment 7,985 17,319 13,590 16,970 4,921
Agriculture [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 66 20 66 20 103
Recorded Investment With Allowance 61 20 61 20 99
Total Recorded Investment 61 20 61 20 99
Related Allowance 17 20 17 20 25
Average Recorded Investment 66 21 69 22 50
Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 19,071 25,241 19,071 25,241 23,466
Recorded Investment With No Allowance 3,755 7,427 3,755 7,427 6,229
Recorded Investment With Allowance 11,046 13,008 11,046 13,008 12,525
Total Recorded Investment 14,801 20,435 14,801 20,435 18,754
Related Allowance 2,369 2,565 2,369 2,565 2,428
Average Recorded Investment 15,473 21,227 17,769 20,856 16,170
Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Unpaid Contractual Principal Balance 1,432 1,375 1,432 1,375 1,421
Recorded Investment With No Allowance 309 254 309 254 280
Recorded Investment With Allowance 914 941 914 941 954
Total Recorded Investment 1,223 1,195 1,223 1,195 1,234
Related Allowance 474 373 474 373 431
Average Recorded Investment $ 1,294 $ 1,288 $ 1,457 $ 1,148 $ 914