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Loans and Allowance for Loan Losses - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Recorded Investment, Total $ 118,221 $ 124,054
Unpaid Principal Balance, Total 119,574 125,349
Related Allowance 10,983 14,486
Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 4,534 6,035
Recorded Investment with no related allowance 25,345 22,031
Unpaid Principal Balance with no related allowance 25,552 22,292
Recorded Investment with related allowance 9,315 13,379
Unpaid Principal Balance with related allowance 9,368 13,432
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 1,634 1,830
Recorded Investment with no related allowance 10,953  
Unpaid Principal Balance with no related allowance 10,953  
Recorded Investment with related allowance 3,555 13,824
Unpaid Principal Balance with related allowance 3,555 13,824
Commercial Real Estate - Other [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 4,702 6,476
Recorded Investment with no related allowance 39,143 41,126
Unpaid Principal Balance with no related allowance 40,043 41,914
Recorded Investment with related allowance 24,404 28,154
Unpaid Principal Balance with related allowance 24,404 28,154
Residential [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 44 44
Recorded Investment with no related allowance 2,302 2,276
Unpaid Principal Balance with no related allowance 2,323 2,296
Recorded Investment with related allowance 873 889
Unpaid Principal Balance with related allowance 873 889
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 69 101
Recorded Investment with no related allowance 958 362
Unpaid Principal Balance with no related allowance 1,130 535
Recorded Investment with related allowance 1,373 2,013
Unpaid Principal Balance with related allowance $ 1,373 $ 2,013