Securities Securities (Summary of Gross Realized Gains and Gross Realized Losses (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| Investments, Debt and Equity Securities [Abstract] | ||||||
| Proceeds from Sale of Debt Securities, Available-for-sale | $ 0 | $ 0 | $ 32,330 | $ 0 | ||
| Available-for-sale Securities, Gross Realized Gains | 0 | 0 | 235 | 0 | ||
| Available-for-sale Securities, Gross Realized Losses | 0 | 0 | (129) | 0 | ||
| Equity Securities, FV-NI, Unrealized Gain (Loss) | [1] | (62) | 0 | (179) | 0 | |
| Gain (Loss) on Investments | $ (62) | $ 0 | $ (73) | $ 0 | ||
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