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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Transfer from level 2 to level 3 $ 1,500,000    
Transfers in or out of level 3   $ 0 $ 0
Accrued interest receivable on loans 54,800,000 64,500,000  
Accrued interest receivable 56,560,000 65,547,000  
Allowance for credit losses $ 155,937,000 204,809,000 116,539,000
LIBOR-based assets and liabilities, exposure percentage 6.50%    
Subordinated capital notes      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
LIBOR-based assets and liabilities, exposure amount $ 36,100,000    
Interest rate cap      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
LIBOR-based assets and liabilities, exposure amount 25,900,000    
Interest rate swaps      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
LIBOR-based assets and liabilities, exposure amount 28,500,000    
Commercial loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Allowance for credit losses 36,770,000 62,184,000 $ 34,886,000
Commercial loans | Adjustable Rate Loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
LIBOR-based assets and liabilities, exposure amount 511,000,000    
Residential mortgage loans | Variable Income Interest Rate      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
LIBOR-based assets and liabilities, exposure amount $ 39,600,000    
Other intangibles | Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Finite lived intangible asset, useful life (in years) 3 years    
Other intangibles | Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Finite lived intangible asset, useful life (in years) 10 years    
COVID-19 Deferral Program Loans      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued interest receivable $ 23,900,000 35,400,000  
Interest receivable, current status 21,500,000 30,500,000  
Allowance for credit losses $ 161,000 $ 711,000