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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Schedule Of Significant Accounting Policies [Line Items]          
Allowance for estimated losses on commitments $ 38,973 $ 37,607 $ 28,707   $ 27,497
Unfounded credit commitment 1,852 808      
Operating lease right-of-use assets 33,943 36,741   $ 43,600  
Operating lease liabilities 39,851 42,734   $ 47,300  
Accrued interest receivable associated with debt securities available-for-sale 2,500        
Ending balance: individually evaluated for impairment 9,986 13,242      
Financing receivable, accrued interest receivable $ 9,400        
Threshold of membership investment component, percentage 0.125%        
Threshold of membership investment component $ 1        
Activity based investment component as a percentage of outstanding advances 4.50%        
Goodwill $ 41,012 $ 41,320      
ESOP repayment period (years) 30 years        
Effect of non-vested restricted stock and stock options outstanding (in shares) 337,768 64,459 380,362    
Cumulative Effect, Period of Adoption, Adjustment          
Schedule Of Significant Accounting Policies [Line Items]          
Increase in allowance for credit losses   $ 11,100      
Allowance for estimated losses on commitments $ 10,400 10,353 $ 0   $ 0
Unfounded credit commitment   737      
PCD loan related reserves $ 6,800 6,800      
Non-PCD loan related reserves   $ 4,300      
COVID-19          
Schedule Of Significant Accounting Policies [Line Items]          
Loan modification program, payment deferral period 90 days        
Loan modification program, extension for payment deferral period 90 days        
Loan modification program, maximum deferral period 180 days        
Minimum          
Schedule Of Significant Accounting Policies [Line Items]          
Ending balance: individually evaluated for impairment $ 500        
Building          
Schedule Of Significant Accounting Policies [Line Items]          
Estimated useful lives of significant classes of assets (years) 40 years        
Furniture And Equipment | Minimum          
Schedule Of Significant Accounting Policies [Line Items]          
Estimated useful lives of significant classes of assets (years) 5 years        
Furniture And Equipment | Maximum          
Schedule Of Significant Accounting Policies [Line Items]          
Estimated useful lives of significant classes of assets (years) 7 years        
Software          
Schedule Of Significant Accounting Policies [Line Items]          
Estimated useful lives of significant classes of assets (years) 3 years