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Investment Securities Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Security | Dec. 31, 2014 USD ($) | Dec. 31, 2015 USD ($)
Available-for-sale securities pledged as collateral | $ 1,800,000,000 |  | $ 1,700,000,000
Available-for-sale securities, amortized cost basis | 2,594,255,000 |  | 2,494,059,000
Single bank stock investment, cost basis | 5,800,000 |  |
Bank stock investment, fair value | $ 11,900,000 |  |
Percent ownership in an individual financial institution | 50.50% |  |
Individual bank stock investment percent to total portfolio | 10.00% |  |
Other than temporary impairment losses, investments, portion recognized in earnings, net, available-for-sale securities | $ 0 | $ 30,000 |
Securities available for sale | 2,559,227,000 |  | 2,484,773,000
Domestic corporate debt securities | 109,400,000 |  |
Equity Securities Financial Institution |  |  |
Available-for-sale securities, equity securities | 23,500,000 |  | 20,600,000
Available-for-sale securities, amortized cost basis | 11,500,000 |  |
Equity Securities, Miscellaneous |  |  |
Available-for-sale securities, equity securities | 1,003,000 |  | 900,000
Auction rate securities |  |  |
Available-for-sale securities, amortized cost basis | 107,215,000 |  | 106,772,000
Securities available for sale | 97,256,000 |  | $ 98,059,000
Auction rate securities | External Credit Rated AAA |  |  |
Carrying value auction rate securities rated AAA | $ 5,500,000 |  |
Percentage auction rate securities rated AAA | 6.00% |  |
Auction rate securities | External Credit Rating, Rated Above Investment Grade |  |  |
Carrying value auction rate securities rated AAA | $ 91,800,000 |  |
Percentage auction rate securities rated AAA | 94.00% |  |
Single-issuer trust preferred securities |  |  |
Unrealized gain (loss) on securities | $ (3,900,000) |  |
Number of securities | Security | 19 |  |
Single-issuer trust preferred securities | External Credit Rating, Rated Below Investment Grade |  |  |
Available-for-sale securities, amortized cost basis | $ 11,500,000 |  |
Securities available for sale | $ 10,000,000 |  |
Number of trust preferred securities | 6 |  |
Single-issuer trust preferred securities | External Credit Rating, BBB |  |  |
Available-for-sale securities, amortized cost basis | $ 3,700,000 |  |
Securities available for sale | $ 2,500,000 |  |

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