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v3.3.1.900

Investment Securities Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Security | Dec. 31, 2014 USD ($)
Available-for-sale securities pledged as collateral | $ 1,700,000 | $ 1,700,000
Available-for-sale securities, amortized cost basis | 2,494,059 | 2,312,087
Single bank stock investment, cost basis | 7,400 |
Bank stock investment, fair value | $ 10,200 |
Percent ownership in an individual financial institution | 49.50% |
Individual bank stock investment percent to total portfolio | 10.00% |
Securities available for sale | $ 2,484,773 | 2,323,371
Domestic corporate debt securities | 97,000 |
Equity securities |  |
Available-for-sale securities, amortized cost basis | 14,677 | 33,469
Securities available for sale | 21,514 | 47,623
Equity Securities Financial Institution |  |
Available-for-sale securities, equity securities | 20,600 | 41,800
Available-for-sale securities, amortized cost basis | 13,900 |
Equity Securities, Miscellaneous |  |
Available-for-sale securities, equity securities | 914 | 5,800
Auction rate securities |  |
Available-for-sale securities, amortized cost basis | 106,772 | 108,751
Securities available for sale | 98,059 | $ 100,941
Single-issuer trust preferred securities |  |
Unrealized gain (loss) on securities | $ (5,500) |
Number of securities | Security | 19 |
External Credit Rating, Rated Above Investment Grade | Auction rate securities |  |
Carrying value auction rate securities rated AAA | $ 92,500 |
Percentage auction rate securities rated AAA | 94.00% |
External Credit Rated AAA | Auction rate securities |  |
Carrying value auction rate securities rated AAA | $ 5,600 |
Percentage auction rate securities rated AAA | 6.00% |
External Credit Rating, Rated Below Investment Grade | Single-issuer trust preferred securities |  |
Available-for-sale securities, amortized cost basis | $ 12,500 |
Number of trust preferred securities | 7 |
Securities available for sale | $ 10,700 |
External Credit Rating, BBB | Single-issuer trust preferred securities |  |
Available-for-sale securities, amortized cost basis | 3,700 |
Securities available for sale | $ 2,600 |

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