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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 515 $ 1,257 $ 1,483 $ 515 $ 1,483 $ 1,257
With a specific allowance recorded, Recorded Investment 891 879 1,058 891 1,058 879
With a specific allowance recorded, Related Allowance 125 330 465 125 465 330
Recorded Investment 1,406 2,136 2,541 1,406 2,541 2,136
Related Allowance 125 330 465 125 465 330
Average Recorded Investment 1,499 $ 2,207 2,924 1,843 2,609 $ 2,509
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 132   222 132 222  
With no related allowance recorded, Unpaid Principal Balance 132   222 132 222  
With no related allowance recorded, Average Recorded Investment 132   222 152 99  
With no related allowance recorded, Interest Income Recognized       1    
With a specific allowance recorded, Average Recorded Investment       13    
Recorded Investment 132   222 132 222  
Unpaid Principal Balance 132   222 132 222  
Average Recorded Investment 132   222 165 99  
Interest Income Recognized       1    
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 383   201 383 201  
With no related allowance recorded, Unpaid Principal Balance 383   201 383 201  
With no related allowance recorded, Average Recorded Investment 51   159 78 159  
With no related allowance recorded, Interest Income Recognized     2 1 2  
With no related allowance recorded, Interest Income Recognized Cash Basis     2 1 2  
With a specific allowance recorded, Recorded Investment 329   305 329 305  
With a specific allowance recorded, Unpaid Principal Balance 329   305 329 305  
With a specific allowance recorded, Related Allowance 35   76 35 76  
With a specific allowance recorded, Average Recorded Investment 377   182 387 133  
With a specific allowance recorded, Interest Income Recognized 4   1 11 8  
With a specific allowance recorded, Interest Income Recognized Cash Basis 1     7 7  
Recorded Investment 712   506 712 506  
Unpaid Principal Balance 712   506 712 506  
Related Allowance 35   76 35 76  
Average Recorded Investment 428   341 465 292  
Interest Income Recognized 4   3 12 10  
Interest Income Recognized Cash Basis 1   2 8 9  
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment     482   482  
With no related allowance recorded, Unpaid Principal Balance     482   482  
With no related allowance recorded, Average Recorded Investment 345   567 367 400  
With no related allowance recorded, Interest Income Recognized 4   10 17 10  
With no related allowance recorded, Interest Income Recognized Cash Basis 4   10 16 10  
With a specific allowance recorded, Recorded Investment 444   560 444 560  
With a specific allowance recorded, Unpaid Principal Balance 444   560 444 560  
With a specific allowance recorded, Related Allowance 68   201 68 201  
With a specific allowance recorded, Average Recorded Investment 30   1,013 254 1,069  
Recorded Investment 444   1,042 444 1,042  
Unpaid Principal Balance 444   1,042 444 1,042  
Related Allowance 68   201 68 201  
Average Recorded Investment 375   1,580 621 1,469  
Interest Income Recognized 4   10 17 10  
Interest Income Recognized Cash Basis 4   10 16 10  
Consumer [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Interest Income Recognized         13  
With a specific allowance recorded, Average Recorded Investment         2  
Average Recorded Investment         2  
Interest Income Recognized         13  
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment     578   578  
With no related allowance recorded, Unpaid Principal Balance     578   578  
With no related allowance recorded, Average Recorded Investment 446   462 450 420  
With no related allowance recorded, Interest Income Recognized 6   7 18 20  
With a specific allowance recorded, Recorded Investment 118   193 118 193  
With a specific allowance recorded, Unpaid Principal Balance 118   193 118 193  
With a specific allowance recorded, Related Allowance 22   188 22 188  
With a specific allowance recorded, Average Recorded Investment 118   319 142 327  
Recorded Investment 118   771 118 771  
Unpaid Principal Balance 118   771 118 771  
Related Allowance 22   188 22 188  
Average Recorded Investment 564   781 592 747  
Interest Income Recognized $ 6   $ 7 $ 18 $ 20