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Investment Securities Narrative (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($)
Schedule of Investments [Line Items] |  |  |
Securities pledged as collateral | $ 1,800,000 | $ 0 |
Amortized cost | 2,655,314 | 2,575,719 |
Available-for-sale Securities, Fair Value Disclosure | 2,592,823 | 2,547,956 |
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost |  | 776 |
Available-for-sale Securities, Fair Value Disclosure |  | $ 918 |
Single-issuer Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Unrealized Loss on Securities | $ 839 |  |
Number of Trust Preferred Securities | security | 17 |  |
External Credit Rating, BBB [Member] | Single-issuer Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost | $ 3,800 |  |
Available-for-sale Securities, Fair Value Disclosure | $ 3,100 |  |
Not Rated By An External Agency [Member] | Single-issuer Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Number of Trust Preferred Securities | security | 2 |  |
External Credit Rating, Rated Below Investment Grade [Member] | Single-issuer Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost | $ 4,900 |  |
Available-for-sale Securities, Fair Value Disclosure | $ 4,700 |  |
Number of Trust Preferred Securities | security | 4 |  |
Pooled Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 11,500 |  | $ 11,500

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