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COVID-19 Pandemic Implications (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Borrower
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Unusual Risk Or Uncertainty [Line Items]        
Loans and leases receivable, gross, carrying amount $ 2,445,765,000 $ 2,445,765,000 $ 1,762,756,000 $ 1,688,173,000
Loan modifications to number of borrowers affected by Covid | Borrower   1,000    
COVID-19 Pandemic Implications [Member]        
Unusual Risk Or Uncertainty [Line Items]        
Loans and leases receivable, gross, carrying amount 444,886,000 $ 444,886,000    
Maximum [Member] | COVID-19 Pandemic Implications [Member]        
Unusual Risk Or Uncertainty [Line Items]        
Modification from deferrals of principal and interest payments   6 months    
Borrowers reverting to interest only payments   6 months    
Minimum [Member] | COVID-19 Pandemic Implications [Member]        
Unusual Risk Or Uncertainty [Line Items]        
Modification from deferrals of principal and interest payments   3 months    
Borrowers reverting to interest only payments   3 months    
PPP Loans [Member] | Small Business Administration [Member]        
Unusual Risk Or Uncertainty [Line Items]        
Loans and leases receivable, gross, carrying amount 588,667,000 $ 588,667,000    
Loan guarantee description   The PPP loans, which are 100 percent guaranteed by the Small Business Administration (“SBA”), have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term.    
Nonrefundable loan processing fees received   $ 20,329,000    
Loan processing fees   2,371,000    
Deferred loan processing fees 17,958,000 $ 17,958,000    
Amortization of loan processing fees description   The PPP loan processing fees will be amortized over the life of the loan.    
PPP Loans [Member] | Small Business Administration [Member] | Interest and Fees on Loans and Leases [Member]        
Unusual Risk Or Uncertainty [Line Items]        
Loan processing fees 2,371,000 $ 2,371,000    
PPP Loans [Member] | Small Business Administration [Member] | Loan Origination Cost [Member]        
Unusual Risk Or Uncertainty [Line Items]        
Deferred loan processing fees $ 17,958,000 $ 17,958,000    
PPP Loans [Member] | Small Business Administration [Member] | Maximum [Member]        
Unusual Risk Or Uncertainty [Line Items]        
Loans maturity term   2 years