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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | $ 2,494,059 | $ 2,312,087
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 28,740 | 49,212
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (38,026) | (37,928)
Available-for-sale Securities | 2,484,773 | 2,323,371
U.S. Government securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 0 | 200
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | 0 | 0
Available-for-sale Securities | 0 | 200
U.S. Government sponsored agency securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 25,154 | 209
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 35 | 5
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (53) | 0
Available-for-sale Securities | 25,136 | 214
State and municipal securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 256,746 | 238,250
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 6,019 | 7,231
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | 0 | (266)
Available-for-sale Securities | 262,765 | 245,215
Corporate debt securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 100,336 | 99,016
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 2,695 | 5,126
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (6,076) | (6,108)
Available-for-sale Securities | 96,955 | 98,034
Collateralized mortgage obligations |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 835,439 | 917,395
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 3,042 | 5,705
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (16,972) | (20,787)
Available-for-sale Securities | 821,509 | 902,313
Mortgage-backed securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 1,154,935 | 914,797
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 10,104 | 16,978
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (6,204) | (2,944)
Available-for-sale Securities | 1,158,835 | 928,831
Auction rate securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 106,772 | 108,751
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (8,713) | (7,810)
Available-for-sale Securities | 98,059 | 100,941
Debt securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 2,479,382 | 2,278,618
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 21,895 | 35,045
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (38,018) | (37,915)
Available-for-sale Securities | 2,463,259 | 2,275,748
Equity securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 14,677 | 33,469
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 6,845 | 14,167
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (8) | (13)
Available-for-sale Securities | $ 21,514 | $ 47,623

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- Definition Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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