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Loans Receivable and Allowance for Credit Losses - Allowance for Loans, by Portfolio Segment and Evaluation Method (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 162,635   $ 123,203      
ACL on individually evaluated loans $ 30,592   $ 7,325      
Individually evaluated loans ACL coverage 18.81%   5.95%      
Collectively evaluated loans $ 13,261,666   $ 13,440,010      
ACL on collectively evaluated loans $ 158,860   $ 199,416      
Collectively evaluated loans ACL coverage 1.20%   1.48%      
Total loans $ 13,424,301   $ 13,563,213      
Allowance for credit loss $ 189,452 $ 207,943 $ 206,741 $ 161,771 $ 144,923 $ 94,144
Total ACL to total loans 1.41%   1.52%      
Real estate loans            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 138,368   $ 93,476      
ACL on individually evaluated loans 27,226   3,683      
Collectively evaluated loans 8,693,908   8,678,658      
ACL on collectively evaluated loans 128,027   158,513      
Total loans 8,832,276   8,772,134      
Allowance for credit loss 155,253 162,307 162,196 119,030 94,645 53,593
Commercial business            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans 20,978   25,706      
ACL on individually evaluated loans $ 3,325   $ 3,575      
Individually evaluated loans ACL coverage 15.85%   13.91%      
Collectively evaluated loans $ 3,980,445   $ 4,132,081      
ACL on collectively evaluated loans $ 26,175   $ 35,580      
Collectively evaluated loans ACL coverage 0.66%   0.86%      
Total loans $ 4,001,423   $ 4,157,787      
Allowance for credit loss $ 29,500 41,860 $ 39,155 35,493 42,883 33,032
Total ACL to total loans 0.74%   0.94%      
Residential Portfolio Segment            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 3,053   $ 3,416      
ACL on individually evaluated loans $ 15   $ 25      
Individually evaluated loans ACL coverage 0.49%   0.73%      
Collectively evaluated loans $ 540,569   $ 578,816      
ACL on collectively evaluated loans $ 3,597   $ 4,202      
Collectively evaluated loans ACL coverage 0.67%   0.73%      
Total loans $ 543,622   $ 582,232      
Allowance for credit loss $ 3,612 2,735 $ 4,227 5,868 5,779 5,925
Total ACL to total loans 0.66%   0.73%      
Consumer            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 236   $ 605      
ACL on individually evaluated loans $ 26   $ 42      
Individually evaluated loans ACL coverage 11.02%   6.94%      
Collectively evaluated loans $ 46,744   $ 50,455      
ACL on collectively evaluated loans $ 1,061   $ 1,121      
Collectively evaluated loans ACL coverage 2.27%   2.22%      
Total loans $ 46,980   $ 51,060      
Allowance for credit loss $ 1,087 $ 1,041 $ 1,163 $ 1,380 $ 1,616 $ 1,594
Total ACL to total loans 2.31%   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 61,360   54,795      
ACL on collectively evaluated loans $ 330   $ 391      
Collectively evaluated loans ACL coverage 0.54%   0.71%      
Total loans $ 61,360   $ 54,795      
Allowance for credit loss $ 330   $ 391      
Total ACL to total loans 0.54%   0.71%      
Commercial | Real estate loans            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 130,944   $ 74,753      
ACL on individually evaluated loans $ 27,226   $ 2,862      
Individually evaluated loans ACL coverage 20.79%   3.83%      
Collectively evaluated loans $ 8,387,171   $ 8,351,206      
ACL on collectively evaluated loans $ 126,040   $ 156,665      
Collectively evaluated loans ACL coverage 1.50%   1.88%      
Total loans $ 8,518,115   $ 8,425,959      
Allowance for credit loss $ 153,266   $ 159,527      
Total ACL to total loans 1.80%   1.89%      
Construction | Real estate loans            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 7,424   $ 18,723      
ACL on individually evaluated loans 0   $ 821      
Individually evaluated loans ACL coverage     4.38%      
Collectively evaluated loans 245,377   $ 272,657      
ACL on collectively evaluated loans $ 1,657   $ 1,457      
Collectively evaluated loans ACL coverage 0.68%   0.53%      
Total loans $ 252,801   $ 291,380      
Allowance for credit loss $ 1,657   $ 2,278      
Total ACL to total loans 0.66%   0.78%