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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | $ 2,594,255 | $ 2,494,059
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 24,807 | 28,740
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (59,835) | (38,026)
Available-for-sale Securities | 2,559,227 | 2,484,773
U.S. Government sponsored agency securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 132 | 25,154
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 2 | 35
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | 0 | (53)
Available-for-sale Securities | 134 | 25,136
State and municipal securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 405,274 | 256,746
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 2,043 | 6,019
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (15,676) | 0
Available-for-sale Securities | 391,641 | 262,765
Corporate debt securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 112,016 | 100,336
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 1,978 | 2,695
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (4,585) | (6,076)
Available-for-sale Securities | 109,409 | 96,955
Collateralized mortgage obligations |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 604,095 | 835,439
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 1,943 | 3,042
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (12,178) | (16,972)
Available-for-sale Securities | 593,860 | 821,509
Mortgage-backed securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 1,353,292 | 1,154,935
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 6,546 | 10,104
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (17,437) | (6,204)
Available-for-sale Securities | 1,342,401 | 1,158,835
Auction rate securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 107,215 | 106,772
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (9,959) | (8,713)
Available-for-sale Securities | 97,256 | 98,059
Debt securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 2,582,024 | 2,479,382
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 12,512 | 21,895
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (59,835) | (38,018)
Available-for-sale Securities | 2,534,701 | 2,463,259
Equity securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 12,231 | 14,677
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 12,295 | 6,845
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | 0 | (8)
Available-for-sale Securities | $ 24,526 | $ 21,514

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