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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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 MSR as of December 31 were as follows:

 
2018
 
2017
Constant prepayment rate
8.58%
 
10.80%
Discount rate
10.01%
 
10.02%
Weighted average life (years)
6.79
 
6.02