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Allowance for Credit Losses on Loans and Leases - Summary of Activity in Allowance for Loan and Lease Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Valuation Allowance [Line Items]    
Balance, beginning of period $ 194,043 $ 147,638
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member  
Charge-offs $ (4,324) (10,385)
Recoveries 4,841 189
Balance, end of period 197,758 162,244
Cumulative Effect, Period of Adoption, Adjustment    
Valuation Allowance [Line Items]    
Balance, beginning of period   $ 1,911
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member
Adjusted Balance    
Valuation Allowance [Line Items]    
Balance, beginning of period 194,043 $ 149,549
Mortgage Receivable    
Valuation Allowance [Line Items]    
Balance, beginning of period 176,538 $ 122,695
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member
Charge-offs (658)  
Recoveries 20 $ 11
Balance, end of period 176,427 141,314
Mortgage Receivable | Cumulative Effect, Period of Adoption, Adjustment    
Valuation Allowance [Line Items]    
Balance, beginning of period   (178)
Mortgage Receivable | Adjusted Balance    
Valuation Allowance [Line Items]    
Balance, beginning of period 176,538 122,517
Other Loans    
Valuation Allowance [Line Items]    
Balance, beginning of period 17,505 $ 24,943
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member
Charge-offs (3,666) $ (10,385)
Recoveries 4,821 178
Balance, end of period 21,331 20,930
Other Loans | Cumulative Effect, Period of Adoption, Adjustment    
Valuation Allowance [Line Items]    
Balance, beginning of period   2,089
Other Loans | Adjusted Balance    
Valuation Allowance [Line Items]    
Balance, beginning of period 17,505 27,032
Non-Covered Loans    
Valuation Allowance [Line Items]    
Provision for credit losses 3,198 22,891
Non-Covered Loans | Mortgage Receivable    
Valuation Allowance [Line Items]    
Provision for credit losses 527 18,786
Non-Covered Loans | Other Loans    
Valuation Allowance [Line Items]    
Provision for credit losses $ 2,671 $ 4,105