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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Summary of Significant Accounting Policies [Abstract]  
Useful Lives Used in Computing Depreciation The useful lives used in computing depreciation are as follows:

Buildings and improvements
15 to 50 years
Furniture and equipment
3 to 10 years
Key Assumptions Used in Measuring the Fair Value of Mortgage Servicing Rights Key assumptions used in measuring the fair value of the MSR as of December 31, were as follows:

 
2021
   
2020
 
Constant prepayment rate
   
15.73
%
   
20.22
%
Discount rate
   
9.50
%
   
10.00
%
Weighted average life (years)
   
4.95
     
3.96