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Investment Securities Narrative (Details) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) Security | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
Schedule of Investments [Line Items] |  |  |
Securities pledged as collateral | $ 1,700,000 | $ 1,800,000 |
Amortized cost | 2,503,895 | 2,594,255 |
Available-for-sale Securities, Fair Value Disclosure | 2,488,699 | 2,559,227 |
Single Bank Stock Investment, cost basis | 4,300 |  |
Single Bank Stock Investment, Fair Value | $ 8,800 |  |
Percent Ownership In An Individual Financial Institution | 42.90% |  |
Individual Bank Stock Investment Percent to Total Portfolio | 10.00% |  |
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost | $ 10,487 | 12,231 |
Available-for-sale Securities, Fair Value Disclosure | 21,455 | 24,526 |
Equity Securities Financial Institution [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Equity Securities | 20,500 | 23,500 |
Amortized cost | 9,700 |  |
Available-for-sale Securities, Fair Value Disclosure | 20,500 |  |
Other Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Equity Securities | 1,000 | $ 1,000 |
Single-issuer Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Unrealized Loss on Securities | $ 1,300 |  |
Number of Trust Preferred Securities | Security | 19 |  |
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 | 2,800 |  |
External Credit Rating, Rated Below Investment Grade [Member] | Single-issuer Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized cost | 11,600 |  |
Available-for-sale Securities, Fair Value Disclosure | $ 10,900 |  |
Number of Trust Preferred Securities | Security | 6 |  |
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 | $ 10,000 |  | $ 10,000

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