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Employee Benefit Plans (Schedule of Net Funded Status) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance   $ 39,200  
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance   40,989 $ 39,200
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Beginning Balance   39,416 39,348
Defined Benefit Plan, Service Cost   305 316
Defined Benefit Plan, Interest Cost   1,740 1,579
Defined Benefit Plan, Other Changes   3,127 (1,207)
Defined Benefit Plan, Actuarial Gain (Loss)   149 841
Defined Benefit Plan, Settlement Losses   (268) 0
Defined Benefit Plan, Benefits Paid   (3,383) (1,461)
Defined Benefit Plan, Benefit Obligation, Ending Balance   41,086 39,416
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance   39,200 38,967
Defined Benefit Plan, Actual Return on Plan Assets   2,172 (306)
Defined Benefit Plan, Contributions by Employer $ 3,000 3,000 2,000
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance   40,989 39,200
Defined Benefit Plan, Unfunded Status of Plan   (97) (216)
SERP [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation, Beginning Balance   6,289 5,827
Defined Benefit Plan, Service Cost   100 121
Defined Benefit Plan, Interest Cost   279 239
Defined Benefit Plan, Other Changes   0 0
Defined Benefit Plan, Actuarial Gain (Loss)   775 190
Defined Benefit Plan, Settlement Losses   0 0
Defined Benefit Plan, Benefits Paid   (141) (88)
Defined Benefit Plan, Benefit Obligation, Ending Balance   7,302 6,289
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance   0 0
Defined Benefit Plan, Actual Return on Plan Assets   0 0
Defined Benefit Plan, Contributions by Employer   141 88
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance   0 0
Defined Benefit Plan, Unfunded Status of Plan   $ (7,302) $ (6,289)