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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Apr. 15, 2015
Dec. 31, 2021
USD ($)
Segment
DerivativeInstrument
Dec. 31, 2020
USD ($)
Dec. 31, 2015
USD ($)
Significant Accounting Policies [Line Items]        
Days past due when loans are generally charged-off in full, in days   120 days    
Number of identified portfolio segments | Segment   6    
Number of designated segments | Segment   6    
Days past due when loans are generally placed on nonaccrual status, in days   90 days 90 days  
Other real estate owned   $ 0 $ 3,000  
FHLB stock   4,400 2,600  
FRB stock   6,400 6,100  
Equity method investments, asset amount   5,520,779 $ 4,912,306  
Number of consecutive years used for compensation calculation     5 years  
Tax credit investments   57,010 $ 34,370  
Investment related liabilities   20,200 17,500  
Retained earnings   384,007 324,850  
Reclassification from HTM   205,581 271,966  
Securities available for sale, at fair value   $ 1,178,515 $ 628,059  
Subordinated Notes [Member]        
Significant Accounting Policies [Line Items]        
Number of designated derivative instrument | DerivativeInstrument   1    
Debt instrument issued amount       $ 40,000
Subordinated Notes [Member] | LIBOR [Member]        
Significant Accounting Policies [Line Items]        
Debt instrument, fixed rate of interest       6.00%
Debt instrument, interest rate terms   three-month LIBOR plus 3.944%    
Debt instrument, percentage of basis spread on variable rate 3.944%      
ASU 2016-13 [Member]        
Significant Accounting Policies [Line Items]        
Change in Accounting Principle, Accounting Standards Update, Adopted     true  
Other Assets [Member]        
Significant Accounting Policies [Line Items]        
Tax credit investments   $ 57,000 $ 34,400  
Small Business Investment Companies [Member] | Other Assets [Member]        
Significant Accounting Policies [Line Items]        
Equity method investments, asset amount   $ 9,900 $ 7,900  
Core Deposits [Member]        
Significant Accounting Policies [Line Items]        
Estimated average life   9 years 6 months    
Other Intangible Assets [Member]        
Significant Accounting Policies [Line Items]        
Estimated average life   20 years    
Minimum [Member]        
Significant Accounting Policies [Line Items]        
Standby letters of credit outstanding original term, in years   1 year    
Loans placed on non-accrual status and criticized assets with exposure   $ 2,000    
Minimum [Member] | Building And Building Improvements [Member]        
Significant Accounting Policies [Line Items]        
Premise and equipment, estimated useful lives, in years   15 years    
Minimum [Member] | Software, Furniture And Equipment [Member]        
Significant Accounting Policies [Line Items]        
Premise and equipment, estimated useful lives, in years   3 years    
Maximum [Member]        
Significant Accounting Policies [Line Items]        
Standby letters of credit outstanding original term, in years   5 years    
Maximum [Member] | Building And Building Improvements [Member]        
Significant Accounting Policies [Line Items]        
Premise and equipment, estimated useful lives, in years   39 years    
Maximum [Member] | Software, Furniture And Equipment [Member]        
Significant Accounting Policies [Line Items]        
Premise and equipment, estimated useful lives, in years   10 years