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Investment Securities - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) position | Dec. 31, 2019 USD ($) position | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Loss upon acquisition of interest-only GNMA securities | $ 7,500 | $ 0 | $ 7,476 | $ 0
Net proceeds from (purchases of) FHLB, Federal Reserve Bank, and other restricted stock |  | 12,846 | 5,471 | 16,233
Unrealized gain (loss) on investment securities |  | 1,447 | 1,299 | (1,634)
Proceeds from sale of AFS debt securities |  | 387,810 | 97,555 | 476,182
Realized gains from sale of AFS debt securities |  | $ 20,100 | $ 1,000 |
Realized losses from sale of AFS debt securities |  |  |  | $ 18,700
Number of available for sale debt securities in an unrealized loss position (position) | position |  | 16 | 0 |
Pledged investment securities fair value |  | $ 18,800 | $ 20,400 |
Interest-only GNMA securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Loss upon acquisition of interest-only GNMA securities |  |  | 7,500 |
Interest-only GNMA securities |  |  | $ 16,272 |
Net proceeds from (purchases of) FHLB, Federal Reserve Bank, and other restricted stock |  | 15,400 |  |
Other investments, realized gain |  | $ 1,000 |  |

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