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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 6 Months Ended
Jun. 30, 2021
USD ($)
credit
Jun. 30, 2020
USD ($)
credit
Jun. 30, 2021
USD ($)
credit
Jun. 30, 2020
USD ($)
credit
Dec. 31, 2020
USD ($)
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]          
Investments in tax credit and other investments, net $ 364,187,000   $ 364,187,000   $ 266,525,000
Accrued expenses and other liabilities — Unfunded commitments 195,631,000   195,631,000   105,282,000
Amortization expense of tax credit and other investments 27,291,000 $ 21,829,000 52,649,000 $ 40,611,000  
Unrealized gains (losses) recognized on equity securities with readily determinable fair values 69,000 720,000 (428,000) 758,000  
Adjustments to equity securities without readily determinable fair values 0 0 0 0  
Investment in tax credit and other investments          
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]          
Pre-tax recoveries   $ 109,000      
OTTI charges 0   0    
Investment in Tax Credit and Other Investments, Single Credit          
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]          
Pre-tax recoveries     $ 1,300,000    
Number of historic tax credits | credit   1 1    
Investment in Tax Credit and Other Investments, Multiple Credit          
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]          
Pre-tax recoveries $ 877,000     $ 259,000  
Number of energy tax credits | credit 2   2    
Number of historic tax credits | credit       2  
Investment in Tax Credit and Other Investments, OTTI, Single Credit          
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]          
OTTI charges   $ 733,000   $ 733,000  
Number of historic tax credits | credit   1   1  
Number of CRA investment | credit   1   1  
Tax credit investments          
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]          
Equity securities with readily determinable fair values $ 26,800,000   $ 26,800,000   31,300,000
Investments in Tax Credit and Other Investments and Other Assets          
Investments in Tax Credit and Other Investments, Net, And Related Unfunded Commitments [Abstract]          
Equity securities without readily determinable fair values $ 29,300,000   $ 29,300,000   $ 23,700,000