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Investment Securities Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Security | Dec. 31, 2016 USD ($)
Available-for-sale securities pledged as collateral | $ 1,800,000 |
Available-for-sale securities, amortized cost basis | 2,575,719 | $ 2,594,255
Securities available for sale | 2,547,956 | 2,559,227
Auction rate securities |  |
Available-for-sale securities, amortized cost basis | 107,410 | 107,215
Securities available for sale | 98,668 | $ 97,256
Single-issuer trust preferred securities |  |
Unrealized gain (loss) on securities | $ (600) |
Number of securities | Security | 18 |
Single-issuer trust preferred securities | External Credit Rating, Rated Below Investment Grade |  |
Available-for-sale securities, amortized cost basis | $ 4,900 |
Securities available for sale | $ 4,700 |
Number of trust preferred securities | 4 |
Single-issuer trust preferred securities | Not Rated by an External Agency |  |
Available-for-sale securities, amortized cost basis | $ 3,800 |
Securities available for sale | $ 3,100 |

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