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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Activity in Accumulated Other Comprehensive Income | Activity in accumulated other comprehensive income for the three months ended March 31, 2018 and 2017 was as follows:
| Unrealized Gains and Losses on Available for Sale Securities |  | Tax Benefit (Expense) |  | Total
| (in thousands)
March 31, 2018 |  |  |  |  |
Balance at beginning of period | $ | (3,188 | ) |  | $ | 1,319 |  |  | $ | (1,869 | )
Other comprehensive loss before reclassification | (8,864 | ) |  | 2,543 |  |  | (6,321 | )
Adjustment to accumulated other comprehensive income related to adoption of ASU 2016-01 and 2018-02 (see Notes 2 and 5) | 529 |  |  | (546 | ) |  | (17 | )
Period change | (8,335 | ) |  | 1,997 |  |  | (6,338 | )
Balance at end of period | $ | (11,523 | ) |  | $ | 3,316 |  |  | $ | (8,207 | )
March 31, 2017 |  |  |  |  |
Balance at beginning of period | $ | (4,089 | ) |  | $ | 1,695 |  |  | $ | (2,394 | )
Other comprehensive income before reclassification | 1,620 |  |  | (560 | ) |  | 1,060 |
Reclassification from accumulated other comprehensive income | (269 | ) |  | — |  |  | (269 | )
Period change | 1,351 |  |  | (560 | ) |  | 791 |
Balance at end of period | $ | (2,738 | ) |  | $ | 1,135 |  |  | $ | (1,603 | )

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- Definition Tabular disclosure of the components of accumulated 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 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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