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Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Summary of Components of Other Comprehensive Income | The table below provides a summary of the components of other comprehensive income (“OCI”) for the periods presented.
|  | For the Three Months Ended March 31,
|  | 2018 |  | 2017
|  | Before-tax |  | Tax effect |  | After-tax |  | Before-tax |  | Tax effect |  | After-tax
|  | (Dollars in thousands)
Investment securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in fair value recorded in accumulated OCI |  | $ | (31,338 | ) |  | $ | (9,265 | ) |  | $ | (22,073 | ) |  | $ | 1,207 |  |  | $ | 507 |  |  | $ | 700 |
Amortization of unrealized gains on securities transferred from available-for-sale to held-to-maturity |  |  | (832 | ) |  |  | (246 | ) |  |  | (586 | ) |  |  | (783 | ) |  |  | (329 | ) |  |  | (454 | )
Net change |  | $ | (32,170 | ) |  | $ | (9,511 | ) |  | $ | (22,659 | ) |  | $ | 424 |  |  | $ | 178 |  |  | $ | 246 |

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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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