XML 121 R97.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Retirement and Share-based Compensation Plans (Employee Stock Ownership Plan) (Details)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
ESOP, requisite service period 6 months
ESOP, vesting percentage 100.00%
ESOP, vesting period 2 years