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Summary of Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
plan
shares
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Number of compensation plans | plan 3        
Award vesting period (in years) 4 years        
ESPP, market price discount percentage 5.00%        
Outstanding balance on ESOP loan $ 0   $ 0    
Unallocated shares (in shares) | shares 0   0    
Cumulative effect of adoption $ 371,186,000   $ 334,392,000 $ 301,728,000 $ 269,584,000
Financing receivable, allowance for credit loss, excluding accrued interest 27,281,000   29,232,000 21,187,000 20,196,000
Off-balance sheet, credit loss, liability 1,800,000        
Deferred tax liabilities, net 3,359,000   1,558,000    
Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of adoption $ 54,078,000   41,899,000 $ 33,218,000 $ 29,257,000
Accounting Standards Update 2016-13          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Financing receivable, allowance for credit loss, excluding accrued interest   $ (1,300,000)      
Off-balance sheet, credit loss, liability   1,100,000      
Deferred tax liabilities, net   41,000      
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of adoption     120,000    
Financing receivable, allowance for credit loss, excluding accrued interest     (1,300,000)    
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of adoption     $ 120,000    
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained Earnings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of adoption   $ 120,000      
Option          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Award vesting period (in years) 4 years        
Restricted Stock Units (RSUs)          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Award vesting period (in years) 3 years        
Building and Building Improvements | Minimum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 20 years        
Building and Building Improvements | Maximum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 40 years        
Furniture and Fixtures | Minimum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 7 years        
Furniture and Fixtures | Maximum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 10 years        
Computer Equipment | Minimum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 5 years        
Computer Equipment | Maximum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 7 years