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Loans and Allowance for Loan Losses - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Recorded Investment, Total $ 118,872 $ 124,054
Unpaid Principal Balance, Total 120,844 125,349
Related Allowance 12,432 14,486
Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 7,855 6,035
Recorded Investment with no related allowance 19,154 22,031
Unpaid Principal Balance with no related allowance 19,462 22,292
Recorded Investment with related allowance 21,116 13,379
Unpaid Principal Balance with related allowance 21,169 13,432
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 1,183 1,830
Recorded Investment with no related allowance 10,890  
Unpaid Principal Balance with no related allowance 10,890  
Recorded Investment with related allowance 2,764 13,824
Unpaid Principal Balance with related allowance 2,764 13,824
Commercial Real Estate - Other [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 3,302 6,476
Recorded Investment with no related allowance 38,517 41,126
Unpaid Principal Balance with no related allowance 39,942 41,914
Recorded Investment with related allowance 21,456 28,154
Unpaid Principal Balance with related allowance 21,456 28,154
Residential [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 39 44
Recorded Investment with no related allowance 1,783 2,276
Unpaid Principal Balance with no related allowance 1,803 2,296
Recorded Investment with related allowance 990 889
Unpaid Principal Balance with related allowance 990 889
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 53 101
Recorded Investment with no related allowance 1,137 362
Unpaid Principal Balance with no related allowance 1,303 535
Recorded Investment with related allowance 1,065 2,013
Unpaid Principal Balance with related allowance $ 1,065 $ 2,013