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Employee Benefit and Deferred Compensation Plans (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Components of net periodic benefit cost (income)      
Service cost $ 0 $ 0 $ 0
Interest cost 1,216 1,095 1,292
Expected return on plan assets (1,872) (2,040) (2,160)
Prior service cost recognized 0 0 0
Recognized actuarial loss 404 331 207
Settlement/curtailment/termination losses 0 0 453
Net periodic benefit cost (252) (614) (208)
Net actuarial loss/(gain) arising during the period 5 2,812 3,047
Net Settlement/curtailment/termination losses 0 0 (453)
Amortization of net actuarial loss recognized in net periodic pension cost (404) (331) (207)
Total recognized in other comprehensive income (399) 2,481 2,387
Total recognized in net periodic benefit cost and other comprehensive income $ (651) $ 1,867 $ 2,179
Discount rate used to determine net periodic pension cost (percent) 4.56% 4.00% 4.83%
Expected return on plan assets (percent) 8000.00% 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 $ 12 $ 17 $ 14
Interest cost 58 60 84
Expected return on plan assets 0 0 0
Prior service cost recognized 0 0 0
Recognized actuarial loss 76 101 89
Settlement/curtailment/termination losses 0 0 0
Net periodic benefit cost 146 178 187
Net actuarial loss/(gain) arising during the period (56) (37) (118)
Amortization of net actuarial loss recognized in net periodic pension cost (76) (101) (89)
Total recognized in other comprehensive income (132) (138) (207)
Total recognized in net periodic benefit cost and other comprehensive income $ 14 $ 40 $ (20)
Discount rate used to determine net periodic pension cost (percent) 3.63% 3.22% 4.66%