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Loans and Allowance for Loan Losses - Schedule of Impaired Loans and Related Allowance (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance $ 42,306 $ 33,546 $ 38,379
Recorded Investment With No Allowance 7,725 7,183 7,657
Recorded Investment With Allowance 20,355 19,992 19,714
Total Recorded Investment 28,080 27,175 27,371
Related Allowance 5,072 5,262 5,012
Three Month Average Recorded Investment 29,286 26,412 22,055
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 15,986 8,309 13,389
Recorded Investment With No Allowance 770 1,227 1,148
Recorded Investment With Allowance 6,183 6,165 6,136
Total Recorded Investment 6,953 7,392 7,284
Related Allowance 2,017 2,165 2,128
Three Month Average Recorded Investment 9,069 6,812 4,921
Agriculture [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 76 19 103
Recorded Investment With Allowance 72 19 99
Total Recorded Investment 72 19 99
Related Allowance 17 7 25
Three Month Average Recorded Investment 72 11 50
Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 24,748 23,740 23,466
Recorded Investment With No Allowance 6,609 5,746 6,229
Recorded Investment With Allowance 13,154 12,727 12,525
Total Recorded Investment 19,763 18,473 18,754
Related Allowance 2,605 2,658 2,428
Three Month Average Recorded Investment 18,935 18,504 16,170
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Contractual Principal Balance 1,496 1,478 1,421
Recorded Investment With No Allowance 346 210 280
Recorded Investment With Allowance 946 1,081 954
Total Recorded Investment 1,292 1,291 1,234
Related Allowance 433 432 431
Three Month Average Recorded Investment $ 1,210 $ 1,085 $ 914