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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Amounts recognized in accumulated other comprehensive loss      
Total recognized in accumulated other comprehensive loss $ 2,649 $ 2,336 $ 2,213
The Bank | Cash Balance Plan      
Change in benefit obligation      
Projected benefit obligation, beginning 15,870 14,518 13,582
Service cost 1,120 1,076 1,040
Interest cost 552 528 468
Actuarial loss (gain) 1,194 276 (347)
Benefits paid (928) (528) (351)
Prior service cost attributed to CVB participation     126
Projected benefit obligation, ending 17,808 15,870 14,518
Change in plan assets      
Fair value of plan assets, beginning 16,202 14,697 14,084
Actual return on plan assets 2,480 1,033 (36)
Employer contributions 1,500 1,000 1,000
Benefits paid (928) (528) (351)
Fair value of plan assets, ending 19,254 16,202 14,697
Funded status 1,446 332 179
Amounts recognized as an other asset (liability) 1,446 332 179
Amounts recognized in accumulated other comprehensive loss      
Net loss 3,987 4,290 4,160
Prior service cost (634) (695) (755)
Deferred taxes (704) (1,259) (1,192)
Total recognized in accumulated other comprehensive loss $ 2,649 $ 2,336 $ 2,213
Weighted-average assumptions for benefit obligation at valuation date      
Discount rate 3.30% 3.70% 3.80%
Expected return on plan assets (as a percent) 7.30% 7.50% 7.50%
Rate of compensation increase 3.00% 3.00% 3.00%