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Employee Benefit and Deferred Compensation Plans (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits      
Components of net periodic benefit cost (income)      
Service cost $ 0 $ 0 $ 0
Interest cost 1,168 1,216 1,095
Expected return on plan assets (1,941) (1,872) (2,040)
Prior service cost recognized 0 0 0
Recognized actuarial loss 401 404 331
Settlement/curtailment/termination losses 0 0 0
Net periodic benefit cost (372) (252) (614)
Net actuarial loss/(gain) arising during the period (1,051) 5 2,812
Net Settlement/curtailment/termination losses 0 0 0
Amortization of net actuarial loss recognized in net periodic pension cost (401) (404) (331)
Total recognized in other comprehensive income (1,452) (399) 2,481
Total recognized in net periodic benefit cost and other comprehensive income $ (1,824) $ (651) $ 1,867
Discount rate used to determine net periodic pension cost (percent) 4.35% 4.56% 4.00%
Expected return on plan assets (percent) 8.00% 8.00% 8.00%
Pension Benefits | HeritageBank      
Components of net periodic benefit cost (income)      
Service cost   $ 0 $ 0
Interest cost   172 305
Expected return on plan assets   (113) (216)
Prior service cost recognized   0 0
Recognized actuarial loss   0 0
Settlement/curtailment/termination losses   (780) (65)
Net periodic benefit cost   (721) 24
Net actuarial loss/(gain) arising during the period   (397) (448)
Net Settlement/curtailment/termination losses   780 65
Amortization of net actuarial loss recognized in net periodic pension cost   0 0
Total recognized in other comprehensive income   383 (383)
Total recognized in net periodic benefit cost and other comprehensive income   $ (338) $ (359)
Discount rate used to determine net periodic pension cost (percent)   4.27% 4.00%
Expected return on plan assets (percent)   3.00% 3.00%
Other Benefits      
Components of net periodic benefit cost (income)      
Service cost $ 9 $ 12 $ 17
Interest cost 42 58 60
Expected return on plan assets 0 0 0
Prior service cost recognized 0 0 0
Recognized actuarial loss 6 76 101
Settlement/curtailment/termination losses 0 0 0
Net periodic benefit cost 57 146 178
Net actuarial loss/(gain) arising during the period (328) (56) (37)
Net Settlement/curtailment/termination losses 0 0 0
Amortization of net actuarial loss recognized in net periodic pension cost (6) (76) (101)
Total recognized in other comprehensive income (334) (132) (138)
Total recognized in net periodic benefit cost and other comprehensive income $ (277) $ 14 $ 40
Discount rate used to determine net periodic pension cost (percent) 3.57% 3.63% 3.22%