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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 49,391 $ 47,665
Recorded Investment with Allowance 39,688 35,709
Related Allowance 5,647 5,797
Average Recorded Investment 35,181 35,105
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,011 894
Recorded Investment with Allowance 1,945 806
Related Allowance 141 101
Average Recorded Investment 1,858 825
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,323 7,742
Recorded Investment with Allowance 10,240 5,688
Related Allowance 496 574
Average Recorded Investment 3,975 5,854
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,745 1,878
Recorded Investment with Allowance 1,542 1,683
Related Allowance 146 124
Average Recorded Investment 1,440 1,612
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,837 5,871
Recorded Investment with Allowance 5,549 5,614
Related Allowance 2,135 1,538
Average Recorded Investment 5,258 5,445
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 18,101 12,015
Recorded Investment with Allowance 11,158 6,272
Related Allowance 2,412 1,457
Average Recorded Investment 11,131 6,478
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 545 686
Recorded Investment with Allowance 514 650
Related Allowance 127 133
Average Recorded Investment 541 788
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,092 9,799
Recorded Investment with Allowance 5,595 8,415
Related Allowance 178 1,870
Average Recorded Investment 7,439 8,062
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 4,737 8,780
Recorded Investment with Allowance 3,145 6,581
Related Allowance 12  
Average Recorded Investment $ 3,539 $ 6,041