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Investment Securities - Amortized cost and carrying value of other investment securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other investment securities |  |  |
Carrying Value | $ 49,124 | $ 25,604 |
Impairment on other investment securities | 0 |  |
Amortized Cost |  |  |
Due in one year or less | 7,267 |  |
Due after one year through five years | 54,662 |  |
Due after five years through ten years | 442,830 |  |
Due after ten years | 1,436,004 |  |
Fair Value | 1,940,763 | 1,540,650 |
Fair Value |  |  |
Due in one year or less | 7,315 |  |
Due after one year through five years | 55,286 |  |
Due after five years through ten years | 447,167 |  |
Due after ten years | 1,446,279 |  |
Fair Value | 1,956,047 | 1,517,067 |
Information with respect to sales of available-for-sale securities |  |  |
Sale proceeds | 242,733 | 73,054 | $ 374,938
Gross realized gains | 6,030 | 31 | 1,832
Gross realized losses | (3,319) | (686) | (411)
Information with respect to sales of Held to Maturity |  |  |
Proceeds from Sale of Held-to-maturity Securities | 0 | 0 | $ 0
Investment in Federal Home Loan Bank Stock |  |  |
Other investment securities |  |  |
Carrying Value | 43,044 | 19,524 |
Investment in unconsolidated subsidiaries |  |  |
Other investment securities |  |  |
Carrying Value | 3,563 | 3,563 |
Other nonmarketable investment securities |  |  |
Other investment securities |  |  |
Carrying Value | $ 2,517 | $ 2,517 |

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