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Loans Receivable and Allowance for Credit Losses - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
security
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
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) 2.00% 2.00%    
Positive or negative qualitative adjustment of the Loss Migration Ratio 0.25% 0.25%    
Financing receivable, balance threshold to determine individual evaluation for impairment $ 1,000 $ 1,000    
Retained earnings 1,127,624 1,127,624   $ 1,083,712
Loan Receivable, Modification to Borrowers Experiencing Financial Difficulty, Defaulted   0    
Financing Receivable, Modification, Commitment to Lend       40
Total TDR loans       41,100
Allowance for TDRs       2,800
Accrued interest receivable on loans 50,600 50,600   47,300
Loans held for sale, at lower of cost or fair value 49,246 49,246   49,245
Cumulative Effect, Period of Adoption, Adjustment | ASU 2022-02        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Retained earnings     $ 287  
TDR Loans on Accrual Status        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total TDR loans       16,900
Troubled Debt Restructuring Nonaccrual Status [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Total TDR loans       $ 24,200
Residential mortgage        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans held for sale, at lower of cost or fair value 3,200 3,200    
Commercial Real Estate and Commercial Business Loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans held for sale, at lower of cost or fair value 46,000 $ 46,000    
C&I loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Number of loan modifications | security   1    
Financing Receivable, Modifications to Borrowers Experiencing Financial Difficulty   $ 26,000    
Modifications to borrowers experiencing financial difficulty, percentage of total loans   0.54%    
Loan Receivable, Modification, Extension Term   4 months    
Modifications to borrowers experiencing financial difficulty, allowance for credit losses $ 115