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Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities (Investments in Tax Credit and Other Investments, Net) (Details)
 3 Months Ended 12 Months Ended 60 Months Ended
Dec. 31, 2020
USD ($)
security
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
fund
Investments in Tax Credit and Other Investments, Net          
Investments in tax credit and other investments, net $ 266,525,000 $ 266,525,000 $ 254,140,000    
Accrued expenses and other liabilities — Unfunded commitments 105,282,000 105,282,000 113,515,000    
Amortization of tax credit and other investments   70,082,000 98,383,000 $ 96,152,000  
Unrealized gain (loss) recognized on marketable equity securities held   732,000 789,000    
New equity securities without readily determinable fair value $ 5,000,000.0        
Numbers of new equity securities without readily determinable fair value | security 1        
Equity Securities without readily determinable fair value, downward price adjustment, annual amount   360,000 0    
Unfunded commitments for investments in AHP and other tax credit investments $ 182,726,000 182,726,000 7,190,625,000    
Tax Credit Investments, Pre-tax Impairment Recoveries   1,100,000      
Investment in Tax Credit and Other Investments          
Investments in Tax Credit and Other Investments, Net          
Pre-tax recoveries   (1,500,000) (1,600,000)    
Asset impairment charges   4,800,000 14,600,000    
DC Solar Tax Credit Investments          
Investments in Tax Credit and Other Investments, Net          
Pre-tax recoveries   (10,700,000) (1,600,000)    
Asset impairment charges     7,000,000.0    
Pre-tax impairment charge or recovery     5,400,000    
Number of tax credit funds | fund         4
Accrued expenses and other liabilities, unfunded commitments | DC Solar Tax Credit Investments          
Investments in Tax Credit and Other Investments, Net          
Unfunded commitments for investments in AHP and other tax credit investments 0 0 0    
Investments in tax credit and other investments, net          
Investments in Tax Credit and Other Investments, Net          
Equity securities with readily determinable fair value 31,300,000 31,300,000 31,700,000    
Other assets and investments in tax credit other investments, net          
Investments in Tax Credit and Other Investments, Net          
Equity securities without readily determinable fair value, amount $ 23,700,000 $ 23,700,000 $ 19,100,000