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Loans Receivable and Allowance for Credit Losses - Allowance for Loans, by Portfolio Segment and Evaluation Method (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 89,649   $ 106,633      
ACL on individually evaluated loans $ 7,199   $ 5,115      
Individually evaluated loans ACL coverage 8.03%   4.80%      
Collectively evaluated loans $ 15,401,538   $ 13,846,110      
ACL on collectively evaluated loans $ 153,362   $ 135,435      
Collectively evaluated loans ACL coverage 1.00%   0.98%      
Total loans $ 15,491,187   $ 13,952,743      
Allowance for credit loss $ 160,561 $ 151,580 $ 140,550 $ 136,774 $ 189,452 $ 206,741
Total ACL to total loans 1.04%   1.01%      
Real estate loans            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 62,936   $ 83,347      
ACL on individually evaluated loans 2,956   2,025      
Collectively evaluated loans 9,441,957   9,022,584      
ACL on collectively evaluated loans 96,968   106,415      
Total loans 9,504,893   9,105,931      
Allowance for credit loss 99,924 99,824 108,440 105,569 155,253 162,196
Commercial business            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans 17,553   19,407      
ACL on individually evaluated loans $ 4,207   $ 3,056      
Individually evaluated loans ACL coverage 23.97%   15.75%      
Collectively evaluated loans $ 5,106,868   $ 4,189,267      
ACL on collectively evaluated loans $ 48,806   $ 24,755      
Collectively evaluated loans ACL coverage 0.96%   0.59%      
Total loans $ 5,124,421   $ 4,208,674      
Allowance for credit loss $ 53,013 44,852 $ 27,811 27,372 29,500 39,155
Total ACL to total loans 1.03%   0.66%      
Residential Portfolio Segment            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 8,731   $ 3,470      
ACL on individually evaluated loans $ 15   $ 11      
Individually evaluated loans ACL coverage 0.17%   0.32%      
Collectively evaluated loans $ 815,078   $ 576,156      
ACL on collectively evaluated loans $ 6,879   $ 3,305      
Collectively evaluated loans ACL coverage 0.84%   0.57%      
Total loans $ 823,809   $ 579,626      
Allowance for credit loss $ 6,894 6,079 $ 3,316 2,689 3,612 4,227
Total ACL to total loans 0.84%   0.57%      
Consumer            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 429   $ 409      
ACL on individually evaluated loans $ 21   $ 23      
Individually evaluated loans ACL coverage 4.90%   5.62%      
Collectively evaluated loans $ 37,635   $ 58,103      
ACL on collectively evaluated loans $ 709   $ 960      
Collectively evaluated loans ACL coverage 1.88%   1.65%      
Total loans $ 38,064   $ 58,512      
Allowance for credit loss $ 730 $ 825 $ 983 $ 1,144 $ 1,087 $ 1,163
Total ACL to total loans 1.92%   1.68%      
Residential | 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 75,488   69,199      
ACL on collectively evaluated loans $ 850   $ 729      
Collectively evaluated loans ACL coverage 1.13%   1.05%      
Total loans $ 75,488   $ 69,199      
Allowance for credit loss $ 850   $ 729      
Total ACL to total loans 1.13%   1.05%      
Commercial | Real estate loans            
Loans by Portfolio Segment and Impairment Method [Abstract]            
Individually evaluated loans $ 62,936   $ 83,347      
ACL on individually evaluated loans $ 2,956   $ 2,025      
Individually evaluated loans ACL coverage 4.70%   2.43%      
Collectively evaluated loans $ 9,153,258   $ 8,732,733      
ACL on collectively evaluated loans $ 94,579   $ 104,145      
Collectively evaluated loans ACL coverage 1.03%   1.19%      
Total loans $ 9,216,194   $ 8,816,080      
Allowance for credit loss $ 97,535   $ 106,170      
Total ACL to total loans 1.06%   1.20%      
Construction | 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 213,211   220,652      
ACL on collectively evaluated loans $ 1,539   $ 1,541      
Collectively evaluated loans ACL coverage 0.72%   0.70%      
Total loans $ 213,211   $ 220,652      
Allowance for credit loss $ 1,539   $ 1,541      
Total ACL to total loans 0.72%   0.70%