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Loans and Leases - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]          
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties $ 38,000   $ 38,000   $ 38,200
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates 16,510   $ 18,082    
CARES act of 2020 aid, election description     the Company made the election to deem that loan modifications do not result in TDRs if they are (1) related to the novel coronavirus disease (“COVID-19”); (2) executed on a loan that was not more than 30 days past due as of December 31, 2019; and (3) executed between March 1, 2020, and the earlier of (A) 60 days after the date of termination of the National Emergency or (B) December 31, 2020. This includes short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant. Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented. At June 30, 2020, total payment deferrals for the entire loan portfolio were $7.4 billion.    
Commercial and Industrial          
Financing Receivable, Recorded Investment [Line Items]          
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates 1,391 $ 18,004 $ 2,963 $ 21,092  
Loan classified as non accrual TDRs 6,400 $ 3,300 6,400 $ 3,300  
Payment Deferrals          
Financing Receivable, Recorded Investment [Line Items]          
Troubled debt restructurings $ 7,400,000   7,400,000    
Financing Receivable Troubled Debt Restructurings Rate Reductions          
Financing Receivable, Recorded Investment [Line Items]          
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates     18,600    
Financing Receivable Troubled Debt Restructurings Forbearance of Arrears          
Financing Receivable, Recorded Investment [Line Items]          
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates     $ 26,300