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Loans Receivable and Allowance for Credit Losses - Allowance for Credit Losses on Financing Receivables (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Allowance for Loan Losses and the Loans Receivables by Impairment Methodology            
Accrued interest receivable on loans $ 47,100,000   $ 47,100,000     $ 54,600,000
Allowance for Loan Losses by Portfolio Segment            
Balance, beginning of period 207,943,000 $ 144,923,000 206,741,000 $ 94,144,000 $ 94,144,000 94,144,000
Provision (credit) for credit/loan losses (7,000,000) 17,500,000 (3,700,000) 45,500,000    
Loans charged off (12,792,000) (904,000) (16,313,000) (6,861,000)    
Recoveries of charge offs 1,301,000 252,000 2,724,000 2,788,000    
Balance, end of period 189,452,000 161,771,000 189,452,000 161,771,000   206,741,000
Allowance for credit losses:            
Individually evaluated 30,592,000   30,592,000     7,325,000
Collectively evaluated 158,860,000   158,860,000     199,416,000
Total 189,452,000   189,452,000     206,741,000
Loans outstanding:            
Individually evaluated 162,635,000   162,635,000     123,203,000
Collectively evaluated 13,261,666,000   13,261,666,000     13,440,010,000
Total 13,424,301,000   13,424,301,000     13,563,213,000
Reserve for unfunded loan commitments recorded in other liabilities 1,400,000   1,400,000     1,300,000
Additions to reserves for unfunded loan commitments recorded in credit related expenses 0 50,000 105,000 $ 660,000    
CECL impact       us-gaap:AccountingStandardsUpdate201613Member Accounting Standards Update 2020-06  
Financing Receivable, Accrued Interest, Allowance For Credit Loss     600,000 $ 0    
ACL for the TDRs that had payment defaults 23,600,000 86,000 23,600,000 143,000    
Total charge-offs of TDR loans modified 0 0 0 0    
COVID-19 Payment Deferral Modifications            
Loans outstanding:            
Financing Receivable, Accrued Interest, Allowance For Credit Loss     751,000     1,000,000.0
Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan Losses by Portfolio Segment            
Balance, end of period   26,200,000   26,200,000    
Real estate            
Allowance for Loan Losses by Portfolio Segment            
Balance, beginning of period 162,307,000 94,645,000 162,196,000 53,593,000 $ 53,593,000 53,593,000
Provision (credit) for credit/loan losses 4,227,000 24,534,000 6,572,000 40,025,000    
Loans charged off (12,172,000) (174,000) (14,990,000) (2,571,000)    
Recoveries of charge offs 891,000 25,000 1,475,000 192,000    
Balance, end of period 155,253,000 119,030,000 155,253,000 119,030,000   162,196,000
Allowance for credit losses:            
Individually evaluated 27,226,000   27,226,000     3,683,000
Collectively evaluated 128,027,000   128,027,000     158,513,000
Total 155,253,000   155,253,000     162,196,000
Loans outstanding:            
Individually evaluated 138,368,000   138,368,000     93,476,000
Collectively evaluated 8,693,908,000   8,693,908,000     8,678,658,000
Total 8,832,276,000   8,832,276,000     8,772,134,000
Real estate | Hotel & motel            
Allowance for Loan Losses by Portfolio Segment            
Loans charged off (11,800,000)          
Real estate | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan Losses by Portfolio Segment            
Balance, end of period   27,791,000   27,791,000    
Commercial business            
Allowance for Loan Losses by Portfolio Segment            
Balance, beginning of period 41,860,000 42,883,000 39,155,000 33,032,000 33,032,000 33,032,000
Provision (credit) for credit/loan losses (12,179,000) (7,151,000) (9,554,000) 4,398,000    
Loans charged off (572,000) (459,000) (1,182,000) (3,494,000)    
Recoveries of charge offs 391,000 220,000 1,081,000 2,579,000    
Balance, end of period 29,500,000 35,493,000 29,500,000 35,493,000   39,155,000
Allowance for credit losses:            
Individually evaluated 3,325,000   3,325,000     3,575,000
Collectively evaluated 26,175,000   26,175,000     35,580,000
Total 29,500,000   29,500,000     39,155,000
Loans outstanding:            
Individually evaluated 20,978,000   20,978,000     25,706,000
Collectively evaluated 3,980,445,000   3,980,445,000     4,132,081,000
Total 4,001,423,000   4,001,423,000     4,157,787,000
Commercial business | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan Losses by Portfolio Segment            
Balance, end of period   (1,022,000)   (1,022,000)    
Residential mortgage            
Allowance for Loan Losses by Portfolio Segment            
Balance, beginning of period 2,735,000 5,779,000 4,227,000 5,925,000 5,925,000 5,925,000
Provision (credit) for credit/loan losses 877,000 89,000 (615,000) 486,000    
Loans charged off 0 0 0 0    
Recoveries of charge offs 0 0 0 0    
Balance, end of period 3,612,000 5,868,000 3,612,000 5,868,000   4,227,000
Allowance for credit losses:            
Individually evaluated 15,000   15,000     25,000
Collectively evaluated 3,597,000   3,597,000     4,202,000
Total 3,612,000   3,612,000     4,227,000
Loans outstanding:            
Individually evaluated 3,053,000   3,053,000     3,416,000
Collectively evaluated 540,569,000   540,569,000     578,816,000
Total 543,622,000   543,622,000     582,232,000
Residential mortgage | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan Losses by Portfolio Segment            
Balance, end of period   (543,000)   (543,000)    
Consumer and other            
Allowance for Loan Losses by Portfolio Segment            
Balance, beginning of period 1,041,000 1,616,000 1,163,000 1,594,000 $ 1,594,000 1,594,000
Provision (credit) for credit/loan losses 75,000 28,000 (103,000) 591,000    
Loans charged off (48,000) (271,000) (141,000) (796,000)    
Recoveries of charge offs 19,000 7,000 168,000 17,000    
Balance, end of period 1,087,000 1,380,000 1,087,000 1,380,000   1,163,000
Allowance for credit losses:            
Individually evaluated 26,000   26,000     42,000
Collectively evaluated 1,061,000   1,061,000     1,121,000
Total 1,087,000   1,087,000     1,163,000
Loans outstanding:            
Individually evaluated 236,000   236,000     605,000
Collectively evaluated 46,744,000   46,744,000     50,455,000
Total $ 46,980,000   $ 46,980,000     $ 51,060,000
Consumer and other | Cumulative Effect, Period of Adoption, Adjustment            
Allowance for Loan Losses by Portfolio Segment            
Balance, end of period   $ (26,000)   $ (26,000)