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Employee Benefit Plans (Schedule of Changes in Benefit Obligation and Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in accumulated other comprehensive loss      
Total $ 2,157 $ 3,988  
Supplemental Executive Retirement Plan [Member]      
Benefit obligations:      
Beginning of year 13,790 11,523  
Service cost [1] 446 335 $ 308
Interest cost [2] 488 452 432
Actuarial (gain) loss (1,534) 1,955  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 473 475  
End of year 12,717 13,790 11,523
Fair value of plan assets:      
Beginning of year 0 0  
Employer contributions 473 475  
Defined Benefit Plan, Plan Assets, Benefits Paid 473 475  
End of year 0 0 0
Unfunded status at end of year(1) [3] 12,717 13,790  
Amounts recognized in accumulated other comprehensive loss      
Net actuarial loss 1,859 3,504  
Total 1,859 3,504  
Other Postretirement Benefits Plan [Member]      
Benefit obligations:      
Beginning of year 3,791 3,635  
Service cost [1] 46 53 59
Interest cost [2] 132 144 151
Actuarial (gain) loss (209) 110  
Defined Benefit Plan, Benefit Obligation, Benefits Paid 144 151  
End of year 3,616 3,791 3,635
Fair value of plan assets:      
Beginning of year 0 0  
Employer contributions 144 151  
Defined Benefit Plan, Plan Assets, Benefits Paid 144 151  
End of year 0 0 $ 0
Unfunded status at end of year(1) [3] 3,616 3,791  
Amounts recognized in accumulated other comprehensive loss      
Net actuarial loss 449 654  
Prior service credit (151) (170)  
Total $ 298 $ 484  
[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.
[3] 1)Presented within other liabilities on the consolidated statements of condition.