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Loans and Allowance for Loan Losses - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment, Total $ 94,498 $ 108,632
Unpaid Principal Balance, Total 97,943 112,089
Related Allowance 8,935 8,148
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with no related allowance 28,559 29,001
Unpaid Principal Balance with no related allowance 29,659 29,634
Recorded Investment with related allowance 9,195 16,959
Unpaid Principal Balance with related allowance 9,214 17,283
Related Allowance 4,980 4,561
Commercial Real Estate - Other [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with no related allowance 34,755 30,585
Unpaid Principal Balance with no related allowance 36,272 32,413
Recorded Investment with related allowance 14,654 26,645
Unpaid Principal Balance with related allowance 15,200 27,177
Related Allowance 3,793 3,437
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with no related allowance 2,253 1,610
Unpaid Principal Balance with no related allowance 2,274 1,631
Recorded Investment with related allowance 1,154 1,081
Unpaid Principal Balance with related allowance 1,154 1,081
Related Allowance 58 54
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment with no related allowance 1,847 827
Unpaid Principal Balance with no related allowance 2,089 946
Recorded Investment with related allowance 2,081 1,924
Unpaid Principal Balance with related allowance 2,081 1,924
Related Allowance $ 104 $ 96