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COVID-19 Pandemic Implications (Narrative) (Details) - USD ($)
6 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2019
Unusual Risk Or Uncertainty [Line Items]              
Loans and leases receivable, net, carrying amount $ 3,089,799,000 $ 2,370,659,000   $ 3,089,799,000 $ 2,370,659,000 $ 3,089,799,000  
Loans and leases receivable, gross, carrying amount 3,104,396,000 2,384,041,000   3,104,396,000 2,384,041,000 3,104,396,000 $ 1,762,756,000
CARES Act [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Loans and leases receivable, gross, carrying amount $ 3,571,000 $ 11,681,000   $ 3,571,000 $ 11,681,000 $ 3,571,000  
CARES Act [Member] | Maximum [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Qualifying deferment status percentage of loan portfolio 1.00% 1.00%   1.00% 1.00% 1.00%  
Coronavirus Aid, Relief, and Economic Security Act [Member] | CARES Act [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Loans and leases receivable, gross, carrying amount $ 3,571,000 $ 11,681,000   $ 3,571,000 $ 11,681,000 $ 3,571,000  
Coronavirus Aid, Relief, and Economic Security Act [Member] | CARES Act [Member] | Maximum [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Qualifying deferment status percentage of loan portfolio 1.00% 1.00%   1.00% 1.00% 1.00%  
PPP Loans [Member] | Small Business Administration [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Loan guarantee description       The PPP loans, which are 100 percent guaranteed by the SBA, have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term      
Loans and leases receivable, net, carrying amount $ 111,286,000 $ 388,313,000   $ 111,286,000 $ 388,313,000 $ 111,286,000  
Nonrefundable loan processing fees received       17,997,000 20,883,000 38,880,000  
Loan processing fees       $ 21,954,000 13,137,000    
PPP Loans [Member] | Small Business Administration [Member] | Coronavirus Aid, Relief, and Economic Security Act [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Loan guarantee description       The PPP loans, which are 100 percent guaranteed by the SBA, have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term.      
Loans and leases receivable, net, carrying amount 111,286,000 388,313,000   $ 111,286,000 388,313,000 $ 111,286,000  
Loans and leases receivable, disbursed amount     $ 101,175,000   5,210,000    
Nonrefundable loan processing fees received 38,880,000     17,997,000 20,883,000    
Deferred loan processing fees not yet realized $ 3,811,000 $ 7,746,000   3,784,000 27,000    
PPP Loans [Member] | Small Business Administration [Member] | Coronavirus Aid, Relief, and Economic Security Act [Member] | Interest and Fees on Loans and Leases [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Loan processing fees       21,954,000 $ 13,137,000    
PPP Loans [Member] | Small Business Administration [Member] | Coronavirus Aid, Relief, and Economic Security Act [Member] | Riverview [Member]              
Unusual Risk Or Uncertainty [Line Items]              
Loans and leases receivable, disbursed amount       $ 4,901,000