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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 38,279 $ 47,665
Recorded Investment with Allowance 28,072 35,709
Related Allowance 4,463 5,797
Average Recorded Investment 31,437 35,105
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,766 894
Recorded Investment with Allowance 1,672 806
Related Allowance 73 101
Average Recorded Investment 1,026 825
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,175 7,742
Recorded Investment with Allowance 2,087 5,688
Related Allowance 448 574
Average Recorded Investment 4,809 5,854
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,884 1,878
Recorded Investment with Allowance 1,682 1,683
Related Allowance 129 124
Average Recorded Investment 1,808 1,612
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,364 5,871
Recorded Investment with Allowance 5,123 5,614
Related Allowance 1,513 1,538
Average Recorded Investment 5,388 5,445
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 11,474 12,015
Recorded Investment with Allowance 5,461 6,272
Related Allowance 1,486 1,457
Average Recorded Investment 5,882 6,478
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 814 686
Recorded Investment with Allowance 777 650
Related Allowance 141 133
Average Recorded Investment 776 788
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,606 9,799
Recorded Investment with Allowance 5,084 8,415
Related Allowance 673 1,870
Average Recorded Investment 5,276 8,062
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 8,196 8,780
Recorded Investment with Allowance 6,186 6,581
Average Recorded Investment $ 6,472 $ 6,041