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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period $ 163,544 $ 147,450 $ 162,359 $ 140,550  
Provision (credit) for credit/loan losses 8,900 3,200 10,600 (7,800)  
Loans charged off (979) (712) (1,474) (2,215)  
Recoveries of charge offs 1,531 1,642 1,918 21,045  
Balance, end of period 172,996 151,580 172,996 151,580  
Allowance for credit losses:          
Individually evaluated 13,173   13,173   $ 3,856
Collectively evaluated 159,823   159,823   158,503
Total 172,996 151,580 172,996 151,580 162,359
Loans outstanding:          
Individually evaluated 60,901   60,901   66,149
Collectively evaluated 14,803,909   14,803,909   15,337,391
Total 14,864,810   14,864,810   15,403,540
Reserve for unfunded loan commitments recorded in other liabilities 3,100   3,100   1,400
Additions to reserves for unfunded loan commitments recorded in credit related expenses 110 180 $ 1,730 380  
Threshold period for loans to be placed on nonaccrual status     90 days    
ASU 2022-02          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period     $ (407)    
Allowance for credit losses:          
Total         (407)
Real estate          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 108,835 106,545 95,884 108,440  
Provision (credit) for credit/loan losses (3,076) (7,229) 9,787 (25,542)  
Loans charged off (561) (476) (561) (1,751)  
Recoveries of charge offs 123 984 192 18,677  
Balance, end of period 105,321 99,824 105,321 99,824  
Allowance for credit losses:          
Individually evaluated 1,150   1,150   870
Collectively evaluated 104,171   104,171   95,014
Total 105,321 99,824 105,321 99,824 95,884
Loans outstanding:          
Individually evaluated 29,096   29,096   43,461
Collectively evaluated 9,163,064   9,163,064   9,371,119
Total 9,192,160   9,192,160   9,414,580
Real estate | ASU 2022-02          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period     19    
Allowance for credit losses:          
Total         19
C&I loans          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 42,790 35,676 56,872 27,811  
Provision (credit) for credit/loan losses 11,013 8,715 (2,487) 15,051  
Loans charged off (298) (172) (738) (349)  
Recoveries of charge offs 1,389 633 1,673 2,339  
Balance, end of period 54,894 44,852 54,894 44,852  
Allowance for credit losses:          
Individually evaluated 11,706   11,706   2,941
Collectively evaluated 43,188   43,188   53,931
Total 54,894 44,852 54,894 44,852 56,872
Loans outstanding:          
Individually evaluated 23,042   23,042   12,477
Collectively evaluated 4,782,084   4,782,084   5,097,055
Total 4,805,126   4,805,126   5,109,532
C&I loans | ASU 2022-02          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period     (426)    
Allowance for credit losses:          
Total         (426)
Residential mortgage loans          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 11,253 4,262 8,920 3,316  
Provision (credit) for credit/loan losses 730 1,817 3,063 2,763  
Loans charged off 0 0 0 0  
Recoveries of charge offs 0 0 0 0  
Balance, end of period 11,983 6,079 11,983 6,079  
Allowance for credit losses:          
Individually evaluated 245   245   24
Collectively evaluated 11,738   11,738   8,896
Total 11,983 6,079 11,983 6,079 8,920
Loans outstanding:          
Individually evaluated 8,583   8,583   9,775
Collectively evaluated 825,794   825,794   836,305
Total 834,377   834,377   846,080
Residential mortgage loans | ASU 2022-02          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period     0    
Allowance for credit losses:          
Total         0
Consumer and other loans          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period 666 967 683 983  
Provision (credit) for credit/loan losses 233 (103) 237 (72)  
Loans charged off (120) (64) (175) (115)  
Recoveries of charge offs 19 25 53 29  
Balance, end of period 798 825 798 825  
Allowance for credit losses:          
Individually evaluated 72   72   21
Collectively evaluated 726   726   662
Total 798 $ 825 798 $ 825 683
Loans outstanding:          
Individually evaluated 180   180   436
Collectively evaluated 32,967   32,967   32,912
Total $ 33,147   33,147   33,348
Consumer and other loans | ASU 2022-02          
Allowance for Loan Losses by Portfolio Segment          
Balance, beginning of period     $ 0    
Allowance for credit losses:          
Total         $ 0