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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 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Allowance for Loan Losses and the Loans Receivables by Impairment Methodology          
Accrued interest receivable on loans $ 35,700 $ 36,200   $ 35,700  
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 151,580 136,774 $ 189,452 140,550 $ 206,741
Provision (credit) for credit/loan losses 9,200   (10,000) 1,400 (13,700)
Loans charged off (550)   (44,583) (2,765) (60,896)
Recoveries of charge offs 331   1,905 21,376 4,629
Balance, end of period 160,561 140,550 136,774 160,561 136,774
Allowance for credit losses:          
Individually evaluated 7,199 5,115   7,199  
Collectively evaluated 153,362 135,435   153,362  
Total 160,561 140,550   160,561  
Loans outstanding:          
Individually evaluated 89,649 106,633   89,649  
Collectively evaluated 15,401,538 13,846,110   15,401,538  
Total 15,491,187 13,952,743   15,491,187  
Reserve for unfunded loan commitments recorded in other liabilities 1,200 1,100   1,200  
Additions to reserves for unfunded loan commitments recorded in credit related expenses (250)   0 130 105
Provision for accrued interest receivables on loans       1,650 770
ACL for the TDRs that had payment defaults 771   51 771 84
Total charge-offs of TDR loans modified 0   0 0 0
Real estate          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 99,824 105,569 155,253 108,440 162,196
Provision (credit) for credit/loan losses 109   (9,142) (25,433) (2,570)
Loans charged off (185) (29,600) (41,655) (1,936) (56,645)
Recoveries of charge offs 176   1,113 18,853 2,588
Balance, end of period 99,924 108,440 105,569 99,924 105,569
Allowance for credit losses:          
Individually evaluated 2,956 2,025   2,956  
Collectively evaluated 96,968 106,415   96,968  
Total 99,924 108,440   99,924  
Loans outstanding:          
Individually evaluated 62,936 83,347   62,936  
Collectively evaluated 9,441,957 9,022,584   9,441,957  
Total 9,504,893 9,105,931   9,504,893  
Commercial business          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 44,852 27,372 29,500 27,811 39,155
Provision (credit) for credit/loan losses 8,276   (1,011) 23,327 (10,565)
Loans charged off (262)   (1,895) (611) (3,077)
Recoveries of charge offs 147   778 2,486 1,859
Balance, end of period 53,013 27,811 27,372 53,013 27,372
Allowance for credit losses:          
Individually evaluated 4,207 3,056   4,207  
Collectively evaluated 48,806 24,755   48,806  
Total 53,013 27,811   53,013  
Loans outstanding:          
Individually evaluated 17,553 19,407   17,553  
Collectively evaluated 5,106,868 4,189,267   5,106,868  
Total 5,124,421 4,208,674   5,124,421  
Residential mortgage          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 6,079 2,689 3,612 3,316 4,227
Provision (credit) for credit/loan losses 837   0 3,600 (615)
Loans charged off (22)   (923) (22) (923)
Recoveries of charge offs 0   0 0 0
Balance, end of period 6,894 3,316 2,689 6,894 2,689
Allowance for credit losses:          
Individually evaluated 15 11   15  
Collectively evaluated 6,879 3,305   6,879  
Total 6,894 3,316   6,894  
Loans outstanding:          
Individually evaluated 8,731 3,470   8,731  
Collectively evaluated 815,078 576,156   815,078  
Total 823,809 579,626   823,809  
Consumer and other          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 825 1,144 1,087 983 1,163
Provision (credit) for credit/loan losses (22)   153 (94) 50
Loans charged off (81)   (110) (196) (251)
Recoveries of charge offs 8   14 37 182
Balance, end of period 730 983 $ 1,144 730 $ 1,144
Allowance for credit losses:          
Individually evaluated 21 23   21  
Collectively evaluated 709 960   709  
Total 730 983   730  
Loans outstanding:          
Individually evaluated 429 409   429  
Collectively evaluated 37,635 58,103   37,635  
Total $ 38,064 $ 58,512   $ 38,064