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Benefit Plans - ESOP (Details) - USD ($)
12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block        
ESOP, requisite service period 1 year   1 year  
ESOP, requisite service period (per year) 1000 hours   1000 hours  
ESOP, shares purchased to partially fulfill annual discretionary allocation 32,000   28,000  
ESOP, cash contribution   $ 0 $ 539,000 $ 539,000
ESOP, vesting period 6 years      
ESOP expense $ 602,000   $ 1,100,000  
ESOP, number of allocated shares acquired with employer loan   40,000   30,000
Minimum        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block        
ESOP participation age limit 21 years   21 years