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Loans and the Allowance for Credit Losses (Details) - Composition of loan portfolio - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 6,587,896 $ 6,247,681
Net deferred loan fees (11,457) (11,374)
Total loans receivable 6,576,439 6,236,307
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans [1] 1,325,488 1,521,967
Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 4,436,626 3,783,550
Commercial Construction Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 552,896 617,747
Residential Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans 270,793 322,564
Consumer Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross loans $ 2,093 $ 1,853
[1] Included in commercial loans as of September 30, 2021 and December 31, 2020 were PPP loans of $177.8 million and $397.5 million, respectively.