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COVID-19 Pandemic Implications (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Borrower
Oct. 26, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Unusual Risk Or Uncertainty [Line Items]            
Loans and leases receivable, net, carrying amount $ 2,509,657,000 $ 2,509,657,000     $ 1,753,241,000  
Loans and leases receivable, gross, carrying amount 2,521,827,000 $ 2,521,827,000     $ 1,762,756,000 $ 1,710,434,000
Loan modifications to number of borrowers affected by Covid | Borrower   1,000        
CARES Act [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Loans and leases receivable, gross, carrying amount $ 32,851,000 $ 32,851,000   $ 444,486,000    
Qualifying deferment status percentage of loan portfolio 1.00% 1.00%   18.00%    
CARES Act [Member] | Subsequent Event [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Loans and leases receivable, gross, carrying amount     $ 11,804,000      
Qualifying deferment status percentage of loan portfolio     1.00%      
PPP Loans [Member] | Small Business Administration [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Loans and leases receivable, net, carrying amount $ 613,924,000 $ 613,924,000        
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   $ 20,883,000        
Loan processing fees 2,583,000 4,954,000        
Deferred loan processing fees 15,929,000 $ 15,929,000        
Amortization of loan processing fees description   The PPP loan processing fees will be amortized over the life of the respective loans.        
Loans and leases receivable, gross, carrying amount 629,853,000 $ 629,853,000        
PPP Loans [Member] | Small Business Administration [Member] | Loans and Leases, Net of Unearned Interest [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Loans and leases receivable, gross, carrying amount 629,853,000 629,853,000        
PPP Loans [Member] | Small Business Administration [Member] | Interest and Fees on Loans and Leases [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Loan processing fees 2,583,000 4,954,000        
PPP Loans [Member] | Small Business Administration [Member] | Loan Origination Cost [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Deferred loan processing fees $ 15,929,000 $ 15,929,000        
PPP Loans [Member] | Small Business Administration [Member] | Maximum [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Loans maturity term   2 years        
Percentage of processing fee per loan   5.00%        
PPP Loans [Member] | Small Business Administration [Member] | Minimum [Member]            
Unusual Risk Or Uncertainty [Line Items]            
Percentage of processing fee per loan   1.00%