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Changes in Accumulated Other Comprehensive Income by Component - Summary of Changes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | $ 399,952 | $ 338,842 | $ 296,456
Other comprehensive (loss) income before reclassifications | (844) | 1,149 | (1,005)
Losses reclassified from other comprehensive income | 165 | 7 | 143
Net current period other comprehensive (loss) income | (679) | 1,156 | (862)
Balance | 440,780 | 399,952 | 338,842
Realized (loss) gain on sales of available-for-sale securities | (200) |  | (200)
Changes in other comprehensive income (loss), tax expense (benefit) | (100) | 300 | (500)
Maximum |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Realized (loss) gain on sales of available-for-sale securities |  | (100) |
Accumulated Other Comprehensive Income (Loss), net of Taxes |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Balance | 837 | (319) | 543
Balance | $ 158 | $ 837 | $ (319)

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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