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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0 $ 0 $ 0
Interest cost 984 1,176 1,043
Expected return on plan assets (1,651) (1,450) (2,077)
Prior service cost recognized 0 0 0
Recognized actuarial loss (gain) 349 442 328
Settlement/curtailment/termination losses 567 0 0
Net periodic benefit cost 249 168 (706)
Net actuarial (gain) loss arising during the period (1,090) (31) (173)
Net Settlement/curtailment/termination losses (567) 0 0
New prior service cost 0 0 0
Amortization of net actuarial (loss) gain recognized in net periodic pension cost (349) (442) (328)
Amortization of prior service cost 0 0 0
Total recognized in other comprehensive income (2,006) (473) (501)
Total recognized in net periodic benefit cost and other comprehensive income $ (1,757) $ (305) $ (1,207)
Discount rate used to determine net periodic pension cost 3.59% 4.56% 3.96%
Expected return on plan assets 6.00% 6.00% 6.00%
Other Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 6 $ 7 $ 8
Interest cost 13 31 31
Expected return on plan assets 0 0 0
Prior service cost recognized 485 0 0
Recognized actuarial loss (gain) (90) (23) 0
Settlement/curtailment/termination losses 0 0 0
Net periodic benefit cost 414 15 39
Net actuarial (gain) loss arising during the period 21 (60) (240)
Net Settlement/curtailment/termination losses 0 0 0
New prior service cost 485 0 0
Amortization of net actuarial (loss) gain recognized in net periodic pension cost 90 23 0
Amortization of prior service cost (485) 0 0
Total recognized in other comprehensive income 111 (37) (240)
Total recognized in net periodic benefit cost and other comprehensive income $ 525 $ (22) $ (201)
Discount rate used to determine net periodic pension cost 2.91% 4.07% 3.37%