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Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses on Financing Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Allowance for Loan Losses and the Loans Receivables by Impairment Methodology          
Accrued interest receivable on loans       $ 55,900 $ 54,600
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period $ 206,741 $ 94,144 $ 94,144    
Provision (credit) for credit/loan losses 3,300 28,000      
Loans charged off (3,521) (5,957)      
Recoveries of charge offs 1,423 2,536      
Balance, end of period 207,943 144,923 206,741    
Allowance for credit losses:          
Individually evaluated       20,641 7,325
Collectively evaluated       187,302 199,416
Total 206,741 144,923 $ 206,741 207,943 206,741
Loans outstanding:          
Individually evaluated       151,953 123,203
Collectively evaluated       13,550,676 13,440,010
Total       13,702,629 13,563,213
Reserve for unfunded loan commitments recorded in other liabilities       1,400 1,300
Additions to reserves for unfunded loan commitments recorded in credit related expenses 105 $ 610      
CECL impact   us-gaap:AccountingStandardsUpdate201613Member Accounting Standards Update 2020-06    
Financing Receivable, Accrued Interest, Allowance For Credit Loss 600 $ 0      
COVID-19 Payment Deferral Modifications          
Loans outstanding:          
Financing Receivable, Accrued Interest, Allowance For Credit Loss 1,300   $ 1,000    
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan Losses by Portfolio Segment          
Balance, end of period   26,200      
Allowance for credit losses:          
Total   26,200      
Real estate          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 162,196 53,593 53,593    
Provision (credit) for credit/loan losses 2,345 15,491      
Loans charged off (2,818) (2,397)      
Recoveries of charge offs 584 167      
Balance, end of period 162,307 94,645 162,196    
Allowance for credit losses:          
Individually evaluated       16,641 3,683
Collectively evaluated       145,666 158,513
Total 162,196 94,645 162,196 162,307 162,196
Loans outstanding:          
Individually evaluated       125,326 93,476
Collectively evaluated       8,686,097 8,678,658
Total       8,811,423 8,772,134
Real estate | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan Losses by Portfolio Segment          
Balance, end of period   27,791      
Allowance for credit losses:          
Total   27,791      
Commercial business          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 39,155 33,032 33,032    
Provision (credit) for credit/loan losses 2,625 11,549      
Loans charged off (610) (3,035)      
Recoveries of charge offs 690 2,359      
Balance, end of period 41,860 42,883 39,155    
Allowance for credit losses:          
Individually evaluated       3,969 3,575
Collectively evaluated       37,891 35,580
Total 39,155 42,883 39,155 41,860 39,155
Loans outstanding:          
Individually evaluated       22,620 25,706
Collectively evaluated       4,323,624 4,132,081
Total       4,346,244 4,157,787
Commercial business | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan Losses by Portfolio Segment          
Balance, end of period   (1,022)      
Allowance for credit losses:          
Total   (1,022)      
Residential mortgage          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 4,227 5,925 5,925    
Provision (credit) for credit/loan losses (1,492) 397      
Loans charged off 0 0      
Recoveries of charge offs 0 0      
Balance, end of period 2,735 5,779 4,227    
Allowance for credit losses:          
Individually evaluated       16 25
Collectively evaluated       2,719 4,202
Total 4,227 5,779 4,227 2,735 4,227
Loans outstanding:          
Individually evaluated       3,379 3,416
Collectively evaluated       497,621 578,816
Total       501,000 582,232
Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan Losses by Portfolio Segment          
Balance, end of period   (543)      
Allowance for credit losses:          
Total   (543)      
Consumer and other          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 1,163 1,594 1,594    
Provision (credit) for credit/loan losses (178) 563      
Loans charged off (93) (525)      
Recoveries of charge offs 149 10      
Balance, end of period 1,041 1,616 1,163    
Allowance for credit losses:          
Individually evaluated       15 42
Collectively evaluated       1,026 1,121
Total $ 1,163 1,616 $ 1,163 1,041 1,163
Loans outstanding:          
Individually evaluated       628 605
Collectively evaluated       43,334 50,455
Total       $ 43,962 $ 51,060
Consumer and other | Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan Losses by Portfolio Segment          
Balance, end of period   (26)      
Allowance for credit losses:          
Total   $ (26)