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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Amounts recognized in accumulated other comprehensive loss      
Total recognized in accumulated other comprehensive loss $ 2,336 $ 2,213 $ 1,700
The Bank | Cash Balance Plan      
Change in benefit obligation      
Projected benefit obligation, beginning 14,518 13,582 10,659
Service cost 1,076 1,040 763
Interest cost 528 468 451
Actuarial (gain) loss 276 (347) 1,882
Benefits paid (528) (351) (173)
Prior service cost attributed to CVB participation   126  
Projected benefit obligation, ending 15,870 14,518 13,582
Change in plan assets      
Fair value of plan assets, beginning 14,697 14,084 11,624
Actual return on plan assets 1,033 (36) 633
Employer contributions 1,000 1,000 2,000
Benefits paid (528) (351) (173)
Fair value of plan assets, ending 16,202 14,697 14,084
Funded status 332 179 502
Amounts recognized as an other asset (liability) 332 179 502
Amounts recognized in accumulated other comprehensive loss      
Net loss 4,290 4,160 3,558
Prior service cost (695) (755) (942)
Deferred taxes (1,259) (1,192) (916)
Total recognized in accumulated other comprehensive loss $ (2,336) $ (2,213) $ (1,700)
Weighted-average assumptions for benefit obligation at valuation date      
Discount rate 3.70% 3.80% 3.60%
Expected return on plan assets (as a percent) 7.50% 7.50% 7.50%
Rate of compensation increase 3.00% 3.00% 3.00%