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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 44,146 $ 47,665
Recorded Investment with Allowance 33,479 35,709
Related Allowance 5,437 5,797
Average Recorded Investment 31,137 35,105
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,886 894
Recorded Investment with Allowance 1,772 806
Related Allowance 64 101
Average Recorded Investment 1,223 825
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,079 7,742
Recorded Investment with Allowance 1,979 5,688
Related Allowance 187 574
Average Recorded Investment 1,933 5,854
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,691 1,878
Recorded Investment with Allowance 1,482 1,683
Related Allowance 132 124
Average Recorded Investment 1,406 1,612
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,116 5,871
Recorded Investment with Allowance 4,886 5,614
Related Allowance 1,893 1,538
Average Recorded Investment 5,079 5,445
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 17,295 12,015
Recorded Investment with Allowance 10,493 6,272
Related Allowance 2,279 1,457
Average Recorded Investment 7,868 6,478
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 639 686
Recorded Investment with Allowance 604 650
Related Allowance 110 133
Average Recorded Investment 691 788
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,873 9,799
Recorded Investment with Allowance 9,384 8,415
Related Allowance 772 1,870
Average Recorded Investment 9,728 8,062
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 4,567 8,780
Recorded Investment with Allowance 2,879 6,581
Average Recorded Investment $ 3,209 $ 6,041