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Loans and Allowance for Loan Losses - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable Impaired [Line Items]    
Recorded Investment, Total $ 109,239 $ 124,054
Unpaid Principal Balance, Total 110,353 125,349
Related Allowance 8,991 14,486
Commercial [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 7,891 6,035
Recorded Investment with no related allowance 23,227 22,031
Unpaid Principal Balance with no related allowance 23,665 22,292
Recorded Investment with related allowance 18,252 13,379
Unpaid Principal Balance with related allowance 18,305 13,432
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance   1,830
Recorded Investment with no related allowance 12,929  
Unpaid Principal Balance with no related allowance 12,929  
Recorded Investment with related allowance   13,824
Unpaid Principal Balance with related allowance   13,824
Commercial Real Estate - Other [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 1,006 6,476
Recorded Investment with no related allowance 37,674 41,126
Unpaid Principal Balance with no related allowance 38,112 41,914
Recorded Investment with related allowance 12,685 28,154
Unpaid Principal Balance with related allowance 12,685 28,154
Residential [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 39 44
Recorded Investment with no related allowance 1,774 2,276
Unpaid Principal Balance with no related allowance 1,794 2,296
Recorded Investment with related allowance 1,201 889
Unpaid Principal Balance with related allowance 1,201 889
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
Related Allowance 55 101
Recorded Investment with no related allowance 403 362
Unpaid Principal Balance with no related allowance 568 535
Recorded Investment with related allowance 1,094 2,013
Unpaid Principal Balance with related allowance $ 1,094 $ 2,013