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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Segment
DerivativeInstrument
Dec. 31, 2019
USD ($)
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 $ 3,000 $ 468  
FHLB stock 2,600 14,600  
FRB stock 6,100 6,100  
Equity method investments, asset amount $ 4,912,306 4,384,178  
Number of consecutive years used for compensation calculation 5 years    
Tax credit investments $ 34,370 16,524  
Retained earnings 324,850 313,364  
Reclassification from HTM 271,966 359,000  
Securities available for sale, at fair value $ 628,059 417,917  
Subordinated Debt Instrument [Member]      
Significant Accounting Policies [Line Items]      
Number of designated derivative instrument | DerivativeInstrument 1    
Debt instrument issued amount     $ 40,000
Subordinated Debt Instrument [Member] | LIBOR [Member]      
Significant Accounting Policies [Line Items]      
Debt instrument, fixed rate of interest     6.00%
ASU 2016-13 [Member]      
Significant Accounting Policies [Line Items]      
Change in Accounting Principle, Accounting Standards Update, Adopted true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020    
Retained earnings $ (8,700)    
Increase in the allowance for credit losses on loans 9,600    
Increase (decrease) in deferred tax assets 3,000    
ASU 2016-13 [Member] | Held To Maturity Investment Securities [Member]      
Significant Accounting Policies [Line Items]      
Increase in the allowance for credit losses on loans 14    
ASU 2016-13 [Member] | Unfunded Commitments [Member]      
Significant Accounting Policies [Line Items]      
Increase in the allowance for credit losses on loans $ 2,100    
ASU 2019-04 [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member]      
Significant Accounting Policies [Line Items]      
Change in Accounting Principle, Accounting Standards Update, Adopted true    
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020    
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect true    
Reclassification from HTM   (26,200)  
Securities available for sale, at fair value   26,200  
Other Assets [Member]      
Significant Accounting Policies [Line Items]      
Tax credit investments $ 34,400 16,500  
Small Business Investment Companies [Member] | Other Assets [Member]      
Significant Accounting Policies [Line Items]      
Equity method investments, asset amount $ 7,900 $ 7,600  
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