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Employee Benefit Plans - Defined Benefit Plans - Change in Plan Obligation and Fair Value, Funded Status and Fair Value Inputs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in accumulated other comprehensive loss      
Total recognized in accumulated other comprehensive loss $ 3,512 $ 2,649  
The Bank | Cash Balance Plan      
Change in benefit obligation      
Projected benefit obligation, beginning 17,808 15,870  
Service cost 1,232 1,120 $ 1,076
Interest cost 521 552 528
Actuarial (gain) loss (1,308) 1,194  
Benefits paid (1,048) (928)  
Projected benefit obligation, ending 17,205 17,808 15,870
Change in plan assets      
Fair value of plan assets, beginning 19,254 16,202  
Actual return on plan assets (1,050) 2,480  
Employer contributions 3,000 1,500  
Benefits paid (1,048) (928)  
Fair value of plan assets, ending 20,156 19,254 $ 16,202
Funded status 2,951 1,446  
Amounts recognized as an other asset (liability) 2,951 1,446  
Amounts recognized in accumulated other comprehensive loss      
Net loss 5,017 3,987  
Prior service cost (572) (634)  
Deferred taxes (933) (704)  
Total recognized in accumulated other comprehensive loss $ 3,512 $ 2,649  
Weighted-average assumptions for benefit obligation at valuation date      
Discount rate 4.00% 3.30%  
Rate of compensation increase 3.00% 3.00%  
Interest crediting rate 5.00% 5.00%