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Investment Securities - Other (Details) $ in Thousands | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
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Investment Securities |  |
Number of securities consisted in portfolio | security | 366 | 355
Number of Positions for unrealized losses | security | 317 | 280
Aggregate fair value of securities in loss position | $ 192,724 | $ 207,929
Loss position for 12 months or longer | 174,791 | 114,649
Aggregate unrealized loss included in accumulated other comprehensive income (loss) | $ 4,496 | $ 3,322

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