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Loans and Allowance for Loan Losses - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment, Total $ 99,540 $ 108,632
Unpaid Principal Balance, Total 107,700 112,089
Related Allowance 10,232 8,148
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with related allowance 5,713 16,959
Unpaid Principal Balance with related allowance 5,713 17,283
Related Allowance 3,424 4,561
Recorded Investment with no related allowance 20,557 29,001
Unpaid Principal Balance with no related allowance 21,483 29,634
Commercial Real Estate - Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with related allowance 26,478 26,178
Unpaid Principal Balance with related allowance 26,902 26,710
Related Allowance 6,253 3,330
Recorded Investment with no related allowance 38,678 30,585
Unpaid Principal Balance with no related allowance 44,564 32,413
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with related allowance 870 1,081
Unpaid Principal Balance with related allowance 870 1,081
Related Allowance 44 54
Recorded Investment with no related allowance 2,443 1,610
Unpaid Principal Balance with no related allowance 2,464 1,631
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with related allowance 2,211 1,924
Unpaid Principal Balance with related allowance 2,228 1,924
Related Allowance 110 96
Recorded Investment with no related allowance 1,685 827
Unpaid Principal Balance with no related allowance 2,105 946
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with related allowance 905 467
Unpaid Principal Balance with related allowance 1,371 467
Related Allowance $ 401 $ 107