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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Balance, beginning |  | $ (7,382) |  |
Total other comprehensive income (loss), net of tax |  | 5,754 | $ (9,371) | $ (15,755)
Balance, end |  | (1,979) | (7,382) |
Available-For-Sale Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Balance, beginning |  | 1,639 | 13,935 | 27,945
Other comprehensive income (loss) before reclassification |  | 2,110 | (13,113) | (13,968)
Reclassification adjustments for gains (losses) included in net income |  | 391 | 817 | (42)
Reclassifications from accumulated other comprehensive income (loss) to retained earnings | [1] | 891 |  |
Total other comprehensive income (loss), net of tax |  | 3,392 | (12,296) | (14,010)
Balance, end |  | 5,031 | 1,639 | 13,935
Derivatives Used for Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Balance, beginning |  | (9,021) | (11,946) | (10,201)
Other comprehensive income (loss) before reclassification |  | 248 | (1,006) | (4,823)
Reclassification adjustments for gains (losses) included in net income |  | 3,005 | 3,931 | 3,078
Reclassifications from accumulated other comprehensive income (loss) to retained earnings | [1] | (1,242) |  |
Total other comprehensive income (loss), net of tax |  | 2,011 | 2,925 | (1,745)
Balance, end |  | (7,010) | (9,021) | (11,946)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Balance, beginning |  | (7,382) | 1,989 | 17,744
Other comprehensive income (loss) before reclassification |  | 2,358 | (14,119) | (18,791)
Reclassification adjustments for gains (losses) included in net income |  | 3,396 | 4,748 | 3,036
Reclassifications from accumulated other comprehensive income (loss) to retained earnings | [1] | (351) |  |
Total other comprehensive income (loss), net of tax |  | 5,403 | (9,371) | (15,755)
Balance, end |  | $ (1,979) | $ (7,382) | $ 1,989
[1] | Reclassifications were due to the one-time revaluation of the deferred tax assets and deferred tax liabilities as a result of the Tax Act. For additional information relating to this reclassification, see Note 1.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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