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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 999,877 | $ 945,107 |
Ending Balance | 1,045,478 | 999,877 | $ 945,107
Accumulated Other Comprehensive Loss, Net Of Tax [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (10,963) | (2,949) | 1,596
Transfer of securities held to maturity to available-for-sale | (12,041) |  |
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | 11,893 | (9,659) | (11,749)
Reclassification Out Of Accumulated Other Comprehensive Income | 10,103 | 1,645 | (7,204)
Other Comprehensive Income (Loss) Other Net Of Tax | 9,955 | (8,014) | (4,545)
Ending Balance | (1,008) | (10,963) | (2,949)
Net unrealized gains on securities available for sale |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (10,972) | (2,638) | 2,209
Transfer of securities held to maturity to available-for-sale | (12,041) |  |
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | 14,335 | (8,104) | (11,563)
Reclassification Out Of Accumulated Other Comprehensive Income | 8,237 | (230) | (6,716)
Other Comprehensive Income (Loss) Other Net Of Tax | 10,531 | (8,334) | (4,847)
Ending Balance | (441) | (10,972) | (2,638)
Net unrealized loss on cash flow hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 9 | (311) | (613)
Transfer of securities held to maturity to available-for-sale | 0 |  |
Other Comprehensive Income Loss Before Reclassifications Net Of Tax | (2,442) | (1,555) | (186)
Reclassification Out Of Accumulated Other Comprehensive Income | 1,866 | 1,875 | (488)
Other Comprehensive Income (Loss) Other Net Of Tax | (576) | 320 | 302
Ending Balance | $ (567) | $ 9 | $ (311)

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