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Loans and Allowance for Loan Losses - Impaired Loans, Segregated by Portfolio and Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance $ 11,847 $ 3,521
With no related allowance recorded, Recorded Investment 10,615 2,828
With no related allowance recorded, Average Recorded Investment 6,938 6,170
With no related allowance recorded, Interest Income Recognized 634 49
With an allowance recorded, Unpaid Principal Balance 13,968 7,666
With an allowance recorded, Recorded Investment 10,215 5,491
Allowance for Loan Losses Allocated 935 627
With an allowance recorded, Average Recorded Investment 7,836 3,551
With an allowance recorded, Interest Income Recognized 195 67
Unpaid Principal Balance 25,815 11,187
Recorded Investment 20,830 8,319
Average Recorded Investment 14,774 9,721
Interest Income Recognized 829 116
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 1,878 904
With no related allowance recorded, Recorded Investment 1,567 676
With no related allowance recorded, Average Recorded Investment 1,426 2,764
With no related allowance recorded, Interest Income Recognized 267 6
With an allowance recorded, Unpaid Principal Balance 4,049 4,493
With an allowance recorded, Recorded Investment 1,597 2,506
Allowance for Loan Losses Allocated 158 270
With an allowance recorded, Average Recorded Investment 1,813 1,792
With an allowance recorded, Interest Income Recognized 16 20
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 8,679 510
With no related allowance recorded, Recorded Investment 8,020 309
With no related allowance recorded, Average Recorded Investment 4,572 1,475
With no related allowance recorded, Interest Income Recognized 252  
With an allowance recorded, Unpaid Principal Balance 1,310 265
With an allowance recorded, Recorded Investment 1,113 240
Allowance for Loan Losses Allocated 108 22
With an allowance recorded, Average Recorded Investment 663 122
With an allowance recorded, Interest Income Recognized 51 1
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 1,230 1,230
With no related allowance recorded, Recorded Investment 969 980
With no related allowance recorded, Average Recorded Investment 587 957
With no related allowance recorded, Interest Income Recognized 29 15
With an allowance recorded, Unpaid Principal Balance 4,868 2,433
With an allowance recorded, Recorded Investment 4,468 2,341
Allowance for Loan Losses Allocated 447 288
With an allowance recorded, Average Recorded Investment 3,916 1,336
With an allowance recorded, Interest Income Recognized 95 32
Agricultural Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 52 824
With no related allowance recorded, Recorded Investment 52 812
With no related allowance recorded, Average Recorded Investment 270 872
With no related allowance recorded, Interest Income Recognized 12 27
With an allowance recorded, Unpaid Principal Balance 1,266 23
With an allowance recorded, Recorded Investment 1,034 23
Allowance for Loan Losses Allocated 129 2
With an allowance recorded, Average Recorded Investment 527 6
With an allowance recorded, Interest Income Recognized 16  
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 1 53
With no related allowance recorded, Recorded Investment   51
With no related allowance recorded, Average Recorded Investment   35
With no related allowance recorded, Interest Income Recognized 1  
With an allowance recorded, Unpaid Principal Balance 677 449
With an allowance recorded, Recorded Investment 559 378
Allowance for Loan Losses Allocated 56 45
With an allowance recorded, Average Recorded Investment 448 271
With an allowance recorded, Interest Income Recognized 15 9
Agricultural [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 7  
With no related allowance recorded, Recorded Investment 7  
With no related allowance recorded, Average Recorded Investment 83 67
With no related allowance recorded, Interest Income Recognized 73 1
With an allowance recorded, Unpaid Principal Balance 1,798 3
With an allowance recorded, Recorded Investment 1,444 3
Allowance for Loan Losses Allocated 37  
With an allowance recorded, Average Recorded Investment 469 24
With an allowance recorded, Interest Income Recognized $ 2 $ 5