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Equity Investment Securities - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment [Line Items] |  |  |  |
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 |  |  |  | $ (188,000)
Equity investments with readily determinable fair value | $ 48,750,000 | $ 48,750,000 | $ 49,835,000 |
Sale of Equity Investments with Readily Determinable Fair Values | 2,600,000 |  |  |
Equity Securities, FV-NI, Gain (Loss) | 0 |  |  |
Equity investments without readily determinable fair values | 26,700,000 | 26,700,000 | 26,400,000 |
Equity investments without readily determinable fair values, impairment | 0 | 0 |  |
Equity investments without readily determinable fair values, observable price changes | 0 | 0 |  |
Mutual funds |  |  |  |
Investment [Line Items] |  |  |  |
Equity investments with readily determinable fair value | 22,100,000 | 22,100,000 | 21,500,000 |
Equity stock in other institutions |  |  |  |
Investment [Line Items] |  |  |  |
Equity investments with readily determinable fair value |  |  | 1,900,000 |
Correspondent bank stock |  |  |  |
Investment [Line Items] |  |  |  |
Equity investments without readily determinable fair values | 370,000 | 370,000 | 370,000 |
Community development financial institutions |  |  |  |
Investment [Line Items] |  |  |  |
Equity investments without readily determinable fair values | 1,000,000.0 | 1,000,000.0 | 1,000,000.0 |
Community reinvestment act investments |  |  |  |
Investment [Line Items] |  |  |  |
Equity investments without readily determinable fair values | $ 25,300,000 | $ 25,300,000 | 25,100,000 |
Retained earnings |  |  |  |
Investment [Line Items] |  |  |  |
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 |  |  | $ (469,000) | $ (469,000)

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