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Loans Receivable and Allowance for Credit Losses - Allowance for Loans, by Portfolio Segment and Evaluation Method (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans $ 151,953 $ 123,203    
ACL on individually evaluated loans $ 20,641 $ 7,325    
Individually evaluated loans ACL coverage 13.58% 5.95%    
Collectively evaluated loans $ 13,550,676 $ 13,440,010    
ACL on collectively evaluated loans $ 187,302 $ 199,416    
Collectively evaluated loans ACL coverage 1.38% 1.48%    
Total loans $ 13,702,629 $ 13,563,213    
Allowance for credit losses $ 207,943 $ 206,741 $ 144,923 $ 94,144
Total ACL to total loans 1.52% 1.52%    
Real estate loans        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans $ 125,326 $ 93,476    
ACL on individually evaluated loans 16,641 3,683    
Collectively evaluated loans 8,686,097 8,678,658    
ACL on collectively evaluated loans 145,666 158,513    
Total loans 8,811,423 8,772,134    
Allowance for credit losses 162,307 162,196 94,645 53,593
Commercial business        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans 22,620 25,706    
ACL on individually evaluated loans $ 3,969 $ 3,575    
Individually evaluated loans ACL coverage 17.55% 13.91%    
Collectively evaluated loans $ 4,323,624 $ 4,132,081    
ACL on collectively evaluated loans $ 37,891 $ 35,580    
Collectively evaluated loans ACL coverage 0.88% 0.86%    
Total loans $ 4,346,244 $ 4,157,787    
Allowance for credit losses $ 41,860 $ 39,155 42,883 33,032
Total ACL to total loans 0.96% 0.94%    
Residential Portfolio Segment        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans $ 3,379 $ 3,416    
ACL on individually evaluated loans $ 16 $ 25    
Individually evaluated loans ACL coverage 0.47% 0.73%    
Collectively evaluated loans $ 497,621 $ 578,816    
ACL on collectively evaluated loans $ 2,719 $ 4,202    
Collectively evaluated loans ACL coverage 0.55% 0.73%    
Total loans $ 501,000 $ 582,232    
Allowance for credit losses $ 2,735 $ 4,227 5,779 5,925
Total ACL to total loans 0.55% 0.73%    
Consumer        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans $ 628 $ 605    
ACL on individually evaluated loans $ 15 $ 42    
Individually evaluated loans ACL coverage 2.39% 6.94%    
Collectively evaluated loans $ 43,334 $ 50,455    
ACL on collectively evaluated loans $ 1,026 $ 1,121    
Collectively evaluated loans ACL coverage 2.37% 2.22%    
Total loans $ 43,962 $ 51,060    
Allowance for credit losses $ 1,041 $ 1,163 $ 1,616 $ 1,594
Total ACL to total loans 2.37% 2.28%    
Residential Mortgage [Member] | Real estate loans        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans $ 0 $ 0    
ACL on individually evaluated loans 0 0    
Collectively evaluated loans 52,671 54,795    
ACL on collectively evaluated loans $ 267 $ 391    
Collectively evaluated loans ACL coverage 0.51% 0.71%    
Total loans $ 52,671 $ 54,795    
Allowance for credit losses $ 267 $ 391    
Total ACL to total loans 0.51% 0.71%    
Commercial | Real estate loans        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans $ 107,205 $ 74,753    
ACL on individually evaluated loans $ 16,641 $ 2,862    
Individually evaluated loans ACL coverage 15.52% 3.83%    
Collectively evaluated loans $ 8,382,433 $ 8,351,206    
ACL on collectively evaluated loans $ 143,735 $ 156,665    
Collectively evaluated loans ACL coverage 1.71% 1.88%    
Total loans $ 8,489,638 $ 8,425,959    
Allowance for credit losses $ 160,376 $ 159,527    
Total ACL to total loans 1.89% 1.89%    
Construction | Real estate loans        
Loans by Portfolio Segment and Impairment Method [Abstract]        
Individually evaluated loans $ 18,121 $ 18,723    
ACL on individually evaluated loans 0 $ 821    
Individually evaluated loans ACL coverage   4.38%    
Collectively evaluated loans 250,993 $ 272,657    
ACL on collectively evaluated loans $ 1,664 $ 1,457    
Collectively evaluated loans ACL coverage 0.66% 0.53%    
Total loans $ 269,114 $ 291,380    
Allowance for credit losses $ 1,664 $ 2,278    
Total ACL to total loans 0.62% 0.78%