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Allowance for Loan Losses - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans considered nonperforming (in days) 90 days    
Threshold for evaluation for impairment of substandard and nonaccrual commercial loans $ 500    
Change-off arising from participation loan agreement 5,236 $ (184)  
Commercial and industrial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Change-off arising from participation loan agreement 5,060 $ 712  
Commercial | Substandard      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Decrease in substandard loans resulted in loans downgraded 15,900    
Substandard loans $ 165,300   $ 181,200