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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 12 Months Ended
Jan. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Valuation Allowance [Line Items]          
Balance, beginning of period $ 147,638 $ 194,043 $ 147,638 $ 147,638 $ 159,820
Accounting Standards Update [Extensible List]   Accounting Standards Update 2016-13   Accounting Standards Update 2016-13  
Charge-offs   $ (4,324) (10,385) $ (22,178) (20,307)
Recoveries 1,900 4,841 189 3,393 1,020
Balance, end of period   197,758 162,244 194,043 147,638
Cumulative Effect, Period of Adoption, Adjustment          
Valuation Allowance [Line Items]          
Balance, beginning of period 1,911   $ 1,911 $ 1,911  
Accounting Standards Update [Extensible List]     Accounting Standards Update 2016-13 Accounting Standards Update 2016-13  
Balance, end of period         1,911
Adjusted Balance          
Valuation Allowance [Line Items]          
Balance, beginning of period 149,549 194,043 $ 149,549 $ 149,549 159,820
Balance, end of period       194,043 149,549
Mortgage Receivable          
Valuation Allowance [Line Items]          
Balance, beginning of period 122,694 176,538 $ 122,694 $ 122,694 130,983
Accounting Standards Update [Extensible List]     Accounting Standards Update 2016-13 Accounting Standards Update 2016-13  
Charge-offs   (658)   $ (1,872) (1,613)
Recoveries   20 $ 11 1,172 61
Balance, end of period   176,427 141,314 176,538 122,694
Mortgage Receivable | Cumulative Effect, Period of Adoption, Adjustment          
Valuation Allowance [Line Items]          
Balance, beginning of period 99   99 99  
Balance, end of period         99
Mortgage Receivable | Adjusted Balance          
Valuation Allowance [Line Items]          
Balance, beginning of period 122,793 176,538 122,793 122,793 130,983
Balance, end of period       176,538 122,793
Other Loans          
Valuation Allowance [Line Items]          
Balance, beginning of period 24,944 17,505 $ 24,944 $ 24,944 28,837
Accounting Standards Update [Extensible List]     Accounting Standards Update 2016-13 Accounting Standards Update 2016-13  
Charge-offs   (3,666) $ (10,385) $ (20,306) (18,694)
Recoveries   4,821 178 2,221 959
Balance, end of period   21,331 20,930 17,505 24,944
Other Loans | Cumulative Effect, Period of Adoption, Adjustment          
Valuation Allowance [Line Items]          
Balance, beginning of period 1,812   1,812 1,812  
Balance, end of period         1,812
Other Loans | Adjusted Balance          
Valuation Allowance [Line Items]          
Balance, beginning of period 26,756 17,505 26,756 26,756 28,837
Balance, end of period       17,505 26,756
Allowance for Credit Losses | Mortgage Receivable          
Valuation Allowance [Line Items]          
Balance, beginning of period 122,695   122,695 122,695  
Balance, end of period         122,695
Allowance for Credit Losses | Mortgage Receivable | Cumulative Effect, Period of Adoption, Adjustment          
Valuation Allowance [Line Items]          
Balance, beginning of period (178)   (178) (178)  
Balance, end of period         (178)
Allowance for Credit Losses | Mortgage Receivable | Adjusted Balance          
Valuation Allowance [Line Items]          
Balance, beginning of period 122,517   122,517 122,517  
Balance, end of period         122,517
Allowance for Credit Losses | Other Loans          
Valuation Allowance [Line Items]          
Balance, beginning of period 24,943   24,943 24,943  
Balance, end of period         24,943
Allowance for Credit Losses | Other Loans | Cumulative Effect, Period of Adoption, Adjustment          
Valuation Allowance [Line Items]          
Balance, beginning of period 2,089   2,089 2,089  
Balance, end of period         2,089
Allowance for Credit Losses | Other Loans | Adjusted Balance          
Valuation Allowance [Line Items]          
Balance, beginning of period $ 27,032   27,032 27,032  
Balance, end of period         27,032
Non-Covered Loans          
Valuation Allowance [Line Items]          
Provision for (recovery of) credit losses on loans and leases   3,198 22,891 63,279 7,105
Non-Covered Loans | Mortgage Receivable          
Valuation Allowance [Line Items]          
Provision for (recovery of) credit losses on loans and leases   527 18,786 54,445 (6,737)
Non-Covered Loans | Other Loans          
Valuation Allowance [Line Items]          
Provision for (recovery of) credit losses on loans and leases   $ 2,671 $ 4,105 $ 8,834 $ 13,842