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Loans and Allowance for Loan Losses - Schedule of Impaired Loans and Related Allowance (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Unpaid Contractual Principal Balance $ 29,966 $ 29,966 $ 28,577 $ 26,941
Recorded Investment With No Allowance 5,097 5,097 6,291 5,566
Recorded Investment With Allowance 16,691 16,691 15,802 14,628
Total Recorded Investment 21,788 21,788 22,093 20,194
Related Allowance 4,645 4,645 4,634 4,213
Year-to-Date Average Recorded Investment 20,026 19,755 26,524 24,497
Three-month Average Recorded Investment   20,026 24,893  
Commercial [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Unpaid Contractual Principal Balance 6,351 6,351 3,928 3,749
Recorded Investment With No Allowance 413 413 278 287
Recorded Investment With Allowance 4,664 4,664 3,203 2,906
Total Recorded Investment 5,077 5,077 3,481 3,193
Related Allowance 1,666 1,666 1,160 1,171
Year-to-Date Average Recorded Investment   4,037 3,990 3,698
Three-month Average Recorded Investment   4,316 3,713  
Agriculture [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Unpaid Contractual Principal Balance 121 121 113 177
Recorded Investment With Allowance 75 75 102 165
Total Recorded Investment 75 75 102 165
Related Allowance 47 47 37 57
Year-to-Date Average Recorded Investment   55 113 179
Three-month Average Recorded Investment   85 104  
Real Estate [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Unpaid Contractual Principal Balance 22,796 22,796 23,559 22,177
Recorded Investment With No Allowance 4,341 4,341 5,546 4,859
Recorded Investment With Allowance 11,783 11,783 12,166 11,359
Total Recorded Investment 16,124 16,124 17,712 16,218
Related Allowance 2,844 2,844 3,256 2,867
Year-to-Date Average Recorded Investment   15,222 21,510 19,837
Three-month Average Recorded Investment   15,114 20,212  
Consumer [Member]        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Unpaid Contractual Principal Balance 698 698 977 838
Recorded Investment With No Allowance 343 343 467 420
Recorded Investment With Allowance 169 169 331 198
Total Recorded Investment 512 512 798 618
Related Allowance $ 88 88 181 118
Year-to-Date Average Recorded Investment   441 911 $ 783
Three-month Average Recorded Investment   $ 511 $ 864