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Loans and Allowance for Credit Losses - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment, Total $ 118,638 $ 104,872
Unpaid Principal Balance, Total 120,286 109,235
Related Allowance 11,632 11,307
Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 7,489 7,111
Recorded Investment with no related allowance 36,975 40,414
Unpaid Principal Balance with no related allowance 34,584 41,212
Recorded Investment with related allowance 18,903 16,377
Unpaid Principal Balance with related allowance 18,905 16,483
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance   6
Recorded Investment with related allowance   237
Unpaid Principal Balance with related allowance   237
Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 139 126
Recorded Investment with no related allowance 904 1,201
Unpaid Principal Balance with no related allowance 1,041 1,305
Recorded Investment with related allowance 2,785 2,525
Unpaid Principal Balance with related allowance 2,785 2,525
Commercial Real Estate - Other [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 3,949 4,015
Recorded Investment with no related allowance 41,334 26,998
Unpaid Principal Balance with no related allowance 45,139 30,264
Recorded Investment with related allowance 15,279 14,752
Unpaid Principal Balance with related allowance 15,353 14,802
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 55 49
Recorded Investment with no related allowance 1,353 1,383
Unpaid Principal Balance with no related allowance 1,374 1,422
Recorded Investment with related allowance 1,105 985
Unpaid Principal Balance with related allowance $ 1,105 $ 985