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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Segment
DerivativeInstrument
Dec. 31, 2021
USD ($)
Dec. 31, 2020
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 $ 19 $ 0    
FHLB stock 13,000 4,400    
FRB stock 6,400 6,400    
Equity method investments, asset amount 5,797,272 5,520,779    
Tax credit investments 55,568 57,010    
Investment related liabilities 4,800 20,200    
Retained earnings 421,340 384,007    
Reclassification from HTM 188,975 205,581    
Securities available for sale, at fair value (amortized cost of $1,127,057 and $1,184,835, respectively) $ 954,371 1,178,515    
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 $ 55,600 57,000    
Small Business Investment Companies [Member] | Other Assets [Member]        
Significant Accounting Policies [Line Items]        
Equity method investments, asset amount $ 12,900 $ 9,900    
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