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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Net unrealized gains on securities available for sale |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | $ (2,638) | $ 2,209
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | (9,576) | 1,707
Reclassification Out Of Accumulated Other Comprehensive Income | (60) | (66)
Other Comprehensive Income (Loss) Other Net Of Tax | (9,636) | 1,641
Ending balance | (12,274) | 3,850
Net unrealized loss on cash flow hedges |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | (311) | (613)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | 26 | (38)
Reclassification Out Of Accumulated Other Comprehensive Income | 374 | 149
Other Comprehensive Income (Loss) Other Net Of Tax | 400 | 111
Ending balance | 89 | (502)
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Accumulated Other Comprehensive Income [Line Items] |  |
Beginning balance | (2,949) | 1,596
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | (9,550) | 1,669
Reclassification Out Of Accumulated Other Comprehensive Income | 314 | 83
Other Comprehensive Income (Loss) Other Net Of Tax | (9,236) | 1,752
Ending balance | $ (12,185) | $ 3,348

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