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Employee Benefit Plans (Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplemental Executive Retirement Plan [Member]      
Net period benefit cost      
Service cost [1] $ 446 $ 335 $ 308
Interest cost [2] 488 452 432
Recognized net actuarial loss(2) [2] 561 246 220
Amortization of prior service cost (credit)(2) [2]     7
Net periodic benefit cost 1,495 1,033 967
Changes in funded status recognized in other comprehensive loss, before taxes      
Net actuarial (gain) loss arising during period (1,534) 1,955 219
Amortization of net unrecognized actuarial loss (561) (246) (220)
Amortization of prior service (cost) credit     (7)
Total recognized in OCI, before taxes (2,095) 1,709 (8)
Total recognized in net periodic benefit cost and OCI, before taxes (600) 2,742 959
Other Postretirement Benefits Plan [Member]      
Net period benefit cost      
Service cost [1] 46 53 59
Interest cost [2] 132 144 151
Recognized net actuarial loss(2) [2] 52 41 30
Amortization of prior service cost (credit)(2) [2] (24) (24) (22)
Net periodic benefit cost 206 214 218
Changes in funded status recognized in other comprehensive loss, before taxes      
Net actuarial (gain) loss arising during period (209) 110 143
Amortization of net unrecognized actuarial loss (52) (41) (30)
Amortization of prior service (cost) credit 24 24 22
Total recognized in OCI, before taxes (237) 93 135
Total recognized in net periodic benefit cost and OCI, before taxes $ (31) $ 307 $ 353
[1] (1)Presented in salaries and employee benefits on the consolidated statements of income.
[2] (2)Presented in other expenses on the consolidated statements of income.