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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment $ 1,915 $ 1,808 $ 999 $ 1,808
With a specific allowance recorded, Recorded Investment 254 246 607 246
Related Allowance 59 31 104 31
Recorded Investment 2,169 2,054 1,606 2,054
Average Recorded Investment 2,135 $ 2,533 1,688 $ 1,958
Consumer Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 648   489  
With no related allowance recorded, Unpaid Principal Balance 648   489  
With no related allowance recorded, Average Recorded Investment 603   492  
With no related allowance recorded, Interest Income Recognized 7   8  
With no related allowance recorded, Interest Income Recognized Cash Basis 1   6  
With a specific allowance recorded, Recorded Investment 254   80  
With a specific allowance recorded, Unpaid Principal Balance 254   80  
Related Allowance 59   20  
With a specific allowance recorded, Average Recorded Investment 254   80  
Recorded Investment 902   569  
Unpaid Principal Balance 902   569  
Average Recorded Investment 857   572  
Interest Income Recognized 7   8  
Interest Income Recognized Cash Basis 1   6  
Agricultural Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Average Recorded Investment     67  
Average Recorded Investment     67  
Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 192   200  
With no related allowance recorded, Unpaid Principal Balance 192   200  
With no related allowance recorded, Average Recorded Investment 193   201  
With no related allowance recorded, Interest Income Recognized 3   3  
With a specific allowance recorded, Recorded Investment     418  
With a specific allowance recorded, Unpaid Principal Balance     418  
Related Allowance     42  
With a specific allowance recorded, Average Recorded Investment     420  
With a specific allowance recorded, Interest Income Recognized     4  
Recorded Investment 192   618  
Unpaid Principal Balance 192   618  
Average Recorded Investment 193   621  
Interest Income Recognized 3   7  
Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 1,075   310  
With no related allowance recorded, Unpaid Principal Balance 1,075   310  
With no related allowance recorded, Average Recorded Investment 1,085   209  
With no related allowance recorded, Interest Income Recognized 15   4  
With a specific allowance recorded, Recorded Investment     109  
With a specific allowance recorded, Unpaid Principal Balance     109  
Related Allowance     42  
With a specific allowance recorded, Average Recorded Investment     219  
Recorded Investment 1,075   419  
Unpaid Principal Balance 1,075   419  
Average Recorded Investment 1,085   428  
Interest Income Recognized $ 15   $ 4