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Investment Securities - Securities Gains and Losses (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Proceeds from sales of securities |  | $ 112,179 | $ 9,229 |
Proceeds from sales of securities available for sale | $ 4,300 | 103,579 | 8,339 | $ 459
Gross realized gains |  | 1,689 | 224 |
Gross realized gains |  |  |  | 137
Gross realized losses |  | (534) | 0 |
Gross realized losses |  |  |  | 0
Net gain | $ 209 | 1,155 | 224 |
Net gain |  | 1,155 | 224 | 137
Related income taxes |  | $ 243 | $ 47 | $ 29

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