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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Summary of Components of Other Comprehensive Income | The tables below provide a summary of the components of OCI for the periods presented.
|  | For the Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | Before-tax |  |  | Tax effect |  |  | After-tax |  |  | 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 |  | $ | (26,435 | ) |  | $ | 7,815 |  |  | $ | (18,620 | ) |  | $ | (11,336 | ) |  | $ | 4,760 |  |  | $ | (6,576 | ) |  | $ | (15,792 | ) |  | $ | 6,633 |  |  | $ | (9,159 | )
Amortization of unrealized (gains)/ losses on securities transferred from available-for-sale to held-to-maturity |  |  | (2,091 | ) |  |  | 619 |  |  |  | (1,472 | ) |  |  | (3,293 | ) |  |  | 1,383 |  |  |  | (1,910 | ) |  |  | (2,174 | ) |  |  | 913 |  |  |  | (1,261 | )
Net realized (gain)/loss reclassified into earnings (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (402 | ) |  |  | 169 |  |  |  | (233 | ) |  |  | (548 | ) |  |  | 230 |  |  |  | (318 | )
Net change |  | $ | (28,526 | ) |  | $ | 8,434 |  |  | $ | (20,092 | ) |  | $ | (15,031 | ) |  | $ | 6,312 |  |  | $ | (8,719 | ) |  | $ | (18,514 | ) |  | $ | 7,776 |  |  | $ | (10,738 | )
(1) | Included in other noninterest income.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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