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Loans Receivable and Allowance for Credit Losses - Additional Information (Details)
 3 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Jun. 30, 2020
loan
Dec. 31, 2020
USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]        
Reasonable and supportable period at which point loss assumptions revert back to historical loss information 2 years      
Reversion period 1 year      
Non-modeled loans as percentage of total loan portfolio (less than) 3.00%      
Positive or negative qualitative adjustment of the Loss Migration Ratio 0.25%      
Financing receivable, balance threshold to determine individual evaluation for impairment $ 500,000      
Total TDR loans $ 79,699,000     $ 51,609,000
Number of loans | loan 11 5    
Allowance for TDRs $ 18,900,000     4,800,000
ACL for TDRs modified during period 14,800,000 $ 49,000    
Total charge-offs of TDR loans modified 0 0    
ACL for the TDRs that had payment defaults 13,100,000 136,000    
Total charge offs for TDR loans that had payment defaults 0 $ 14,000    
Accrued interest receivable on loans 55,900,000     54,600,000
Total loans 13,702,629,000     13,563,213,000
Net deferred fees/costs 15,400,000     3,600,000
COVID-19 Pandemic        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Amount of loans modified 949,100,000      
SBA, Paycheck Protection Program Loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Net deferred fees/costs 18,300,000     6,400,000
Real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total loans $ 8,811,423,000     8,772,134,000
Real estate | COVID-19 Pandemic        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Percent of loans modified (more than) 94.00%      
Real estate | TDR Loans on Accrual Status        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total TDR loans $ 33,067,000     25,771,000
Real estate | Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total loans 8,489,638,000     8,425,959,000
Real estate | Commercial | TDR Loans on Accrual Status        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total TDR loans $ 33,100,000     25,800,000
Number of loans | loan 34   33  
Commercial business        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Number of loans | loan 1 1    
Total loans $ 4,346,244,000     4,157,787,000
Commercial business | SBA, Paycheck Protection Program Loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total loans 715,500,000     452,700,000
Commercial business | TDR Loans on Accrual Status        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total TDR loans $ 8,537,000     11,411,000
Number of loans | loan 21   25  
Consumer and other        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Number of loans | loan 4 1    
Total loans $ 43,962,000     51,060,000
Consumer and other | TDR Loans on Accrual Status        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total TDR loans $ 169,000     $ 172,000
Number of loans | loan 14   16  
Minimum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Temporary modifications, period of interest only payments 3 months      
Minimum | COVID-19 Pandemic        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Period of full payment deferrals related to most loan modifications 3 months      
Maximum        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Temporary modifications, period of interest only payments 6 months      
Maximum | COVID-19 Pandemic        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Period of full payment deferrals related to most loan modifications 9 months