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Employee Benefit and Deferred Compensation Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0 $ 0 $ 0
Interest cost 1,043 1,168 1,216
Expected return on plan assets (2,077) (1,941) (1,872)
Prior service cost recognized 0 0 0
Recognized actuarial loss 328 401 404
Settlement/curtailment/termination losses 0 0 0
Net periodic benefit cost (706) (372) (252)
Net actuarial (gain) loss arising during the period (173) (1,051) 5
Net Settlement/curtailment/termination losses 0 0 0
Amortization of net actuarial loss recognized in net periodic pension cost (328) (401) (404)
Total recognized in other comprehensive income (501) (1,452) (399)
Total recognized in net periodic benefit cost and other comprehensive income $ (1,207) $ (1,824) $ (651)
Discount rate used to determine net periodic pension cost 3.96% 4.35% 4.56%
Expected return on plan assets 6.00% 8.00% 8.00%
Pension Benefits | HeritageBank      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost     $ 0
Interest cost     172
Expected return on plan assets     (113)
Prior service cost recognized     0
Recognized actuarial loss     0
Settlement/curtailment/termination losses     (780)
Net periodic benefit cost     (721)
Net actuarial (gain) loss arising during the period     (397)
Net Settlement/curtailment/termination losses     780
Amortization of net actuarial loss recognized in net periodic pension cost     0
Total recognized in other comprehensive income     383
Total recognized in net periodic benefit cost and other comprehensive income     $ (338)
Discount rate used to determine net periodic pension cost     4.27%
Expected return on plan assets     3.00%
Other Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 8 $ 9 $ 12
Interest cost 31 42 58
Expected return on plan assets 0 0 0
Prior service cost recognized 0 0 0
Recognized actuarial loss 0 6 76
Settlement/curtailment/termination losses 0 0 0
Net periodic benefit cost 39 57 146
Net actuarial (gain) loss arising during the period (240) (328) (56)
Net Settlement/curtailment/termination losses 0 0 0
Amortization of net actuarial loss recognized in net periodic pension cost 0 (6) (76)
Total recognized in other comprehensive income (240) (334) (132)
Total recognized in net periodic benefit cost and other comprehensive income $ (201) $ (277) $ 14
Discount rate used to determine net periodic pension cost 3.37% 3.57% 3.63%