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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) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Investments in Tax Credit and Other Investments, Net [Line Items]          
Investments in tax credit and other investments, net $ 254,512,000   $ 254,512,000   $ 254,140,000
Accrued expenses and other liabilities — Unfunded commitments 107,583,000   107,583,000   113,515,000
Amortization expense of tax credit and other investments 12,286,000 $ 16,833,000 54,370,000 $ 58,477,000  
Unrealized gains recognized on equity securities with readily determinable fair values 55,000 188,000 813,000 955,000  
Adjustments to equity securities without readily determinable fair values 0 0 0 0  
AFS debt securities, Fair Value 4,539,160,000   4,539,160,000   3,317,214,000
Investment in tax credit and other investments          
Investments in Tax Credit and Other Investments, Net [Line Items]          
OTTI charges 0 $ 1,700,000 474,000 11,600,000  
DC Solar          
Investments in Tax Credit and Other Investments, Net [Line Items]          
OTTI charges       $ 7,000,000.0  
Collateralized loan obligations (“CLOs”)          
Investments in Tax Credit and Other Investments, Net [Line Items]          
AFS debt securities, Fair Value 283,422,000   283,422,000   284,706,000
Tax credit investments          
Investments in Tax Credit and Other Investments, Net [Line Items]          
Equity securities with readily determinable fair values 31,300,000   31,300,000   31,700,000
Other Assets [Member]          
Investments in Tax Credit and Other Investments, Net [Line Items]          
Equity securities without readily determinable fair values $ 18,800,000   $ 18,800,000   $ 19,100,000