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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, 2015
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 1,483 $ 675 $ 1,209 $ 1,483 $ 1,209 $ 675
With a specific allowance recorded, Recorded Investment 1,058 1,168 477 1,058 477 1,168
With a specific allowance recorded, Related Allowance 465 387 252 465 252 387
Recorded Investment 2,541 1,843 1,686 2,541 1,686 1,843
Related Allowance 465 387 252 465 252 387
Average Recorded Investment 2,924 $ 1,730 1,788 2,609 1,989 $ 1,929
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 222     222    
With no related allowance recorded, Unpaid Principal Balance 222     222    
With no related allowance recorded, Average Recorded Investment 222   94 99 125  
With no related allowance recorded, Interest Income Recognized     7   8  
Recorded Investment 222     222    
Unpaid Principal Balance 222     222    
Average Recorded Investment 222   94 99 125  
Interest Income Recognized     7   8  
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 201   26 201 26  
With no related allowance recorded, Unpaid Principal Balance 201   26 201 26  
With no related allowance recorded, Average Recorded Investment 159   26 159 38  
With no related allowance recorded, Interest Income Recognized 2     2 1  
With no related allowance recorded, Interest Income Recognized on a Cash Basis 2     2    
With a specific allowance recorded, Recorded Investment 305   139 305 139  
With a specific allowance recorded, Unpaid Principal Balance 305   139 305 139  
With a specific allowance recorded, Related Allowance 76   49 76 49  
With a specific allowance recorded, Average Recorded Investment 182   112 133 122  
With a specific allowance recorded, Interest Income Recognized 1   1 8 24  
With a specific allowance recorded, Interest Income Recognized on a Cash Basis       7    
Recorded Investment 506   165 506 165  
Unpaid Principal Balance 506   165 506 165  
Related Allowance 76   49 76 49  
Average Recorded Investment 341   138 292 160  
Interest Income Recognized 3   1 10 25  
Interest Income Recognized on a Cash Basis 2     9    
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 482   709 482 709  
With no related allowance recorded, Unpaid Principal Balance 482   709 482 709  
With no related allowance recorded, Average Recorded Investment 567   739 400 829  
With no related allowance recorded, Interest Income Recognized 10     10 9  
With no related allowance recorded, Interest Income Recognized on a Cash Basis 10     10    
With a specific allowance recorded, Recorded Investment 560     560    
With a specific allowance recorded, Unpaid Principal Balance 560     560    
With a specific allowance recorded, Related Allowance 201     201    
With a specific allowance recorded, Average Recorded Investment 1,013     1,069 32  
Recorded Investment 1,042   709 1,042 709  
Unpaid Principal Balance 1,042   709 1,042 709  
Related Allowance 201     201    
Average Recorded Investment 1,580   739 1,469 861  
Interest Income Recognized 10     10 9  
Interest Income Recognized on a Cash Basis 10     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   474 578 474  
With no related allowance recorded, Unpaid Principal Balance 578   474 578 474  
With no related allowance recorded, Average Recorded Investment 462   476 420 279  
With no related allowance recorded, Interest Income Recognized 7   7 20 7  
With a specific allowance recorded, Recorded Investment 193   338 193 338  
With a specific allowance recorded, Unpaid Principal Balance 193   345 193 345  
With a specific allowance recorded, Related Allowance 188   203 188 203  
With a specific allowance recorded, Average Recorded Investment 319   341 327 564  
Recorded Investment 771   812 771 812  
Unpaid Principal Balance 771   819 771 819  
Related Allowance 188   203 188 203  
Average Recorded Investment 781   817 747 843  
Interest Income Recognized $ 7   $ 7 $ 20 $ 7