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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | 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 |  | $ | (11,336) |  |  | $ | (4,760) |  |  | $ | (6,576) |  |  | $ | (15,792) |  |  | $ | (6,633) |  |  | $ | (9,159) |  |  | $ | (22,667) |  |  | $ | (9,519) |  |  | $ | (13,148) |
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 6,690 |  |  |  | 2,808 |  |  |  | 3,882 |
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity |  |  | (3,293) |  |  |  | (1,383) |  |  |  | (1,910) |  |  |  | (2,174) |  |  |  | (913) |  |  |  | (1,261) |  |  |  | (1,573) |  |  |  | (660) |  |  |  | (913) |
Net realized (gain)/loss reclassified into earnings (1) |  |  | (402) |  |  |  | (169) |  |  |  | (233) |  |  |  | (548) |  |  |  | (230) |  |  |  | (318) |  |  |  | 22 |  |  |  | 9 |  |  |  | 13 |
Net change |  | $ | (15,031) |  |  | $ | (6,312) |  |  | $ | (8,719) |  |  | $ | (18,514) |  |  | $ | (7,776) |  |  | $ | (10,738) |  |  | $ | (17,528) |  |  | $ | (7,362) |  |  | $ | (10,166) |
| (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://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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