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Stockholders' Equity (Line Items in Consolidated Income Statements Affected by Amounts Reclassified from Accumulated Other Comprehensive Income) (Details) - Amount Reclassified from Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications, net of tax | [1] | $ (5,193) | $ (4,251)
Available for Sale Securities [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Gain on sale of AFS securities | [1] | 1,912 | 165
Tax effect | [1] | (694) | (58)
Net of tax | [1] | 1,218 | 107
HTM Securities Transferred from AFS [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of unrealized net loss on securities transferred to HTM | [1] | (3,830) | (3,530)
Tax effect | [1] | 1,427 | 1,236
Net of tax | [1] | (2,403) | (2,294)
Employee Benefit Plans [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of defined benefit pension and post-retirement items | [1],[2] | (5,928) | (3,175)
Tax effect | [1] | 1,920 | 1,111
Net of tax | [1] | $ (4,008) | $ (2,064)
[1] | Amounts in parenthesis indicate reduction in net income.
[2] | These AOCI components are included in the computation of net periodic pension and post-retirement cost that is reported with employee benefits expense (see footnote 15 for additional details).

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