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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | $ 2,575,719 | $ 2,594,255
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 13,062 | 24,807
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (40,825) | (59,835)
Available-for-sale Securities | 2,547,956 | 2,559,227
U.S. Government sponsored agency securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 5,962 | 132
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 2 | 2
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (26) | 0
Available-for-sale Securities | 5,938 | 134
State and municipal securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 405,860 | 405,274
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 5,638 | 2,043
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (2,549) | (15,676)
Available-for-sale Securities | 408,949 | 391,641
Corporate debt securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 96,353 | 112,016
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 2,832 | 1,978
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (1,876) | (4,585)
Available-for-sale Securities | 97,309 | 109,409
Collateralized mortgage obligations |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 611,927 | 604,095
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 491 | 1,943
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (9,795) | (12,178)
Available-for-sale Securities | 602,623 | 593,860
Residential mortgage-backed securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 1,132,080 | 1,328,192
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 3,957 | 6,546
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (15,241) | (16,900)
Available-for-sale Securities | 1,120,796 | 1,317,838
Residential mortgage-backed securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 215,351 | 25,100
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (2,596) | (537)
Available-for-sale Securities | 212,755 | 24,563
Auction rate securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 107,410 | 107,215
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 0 | 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (8,742) | (9,959)
Available-for-sale Securities | 98,668 | 97,256
Debt securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 2,574,943 | 2,582,024
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 12,920 | 12,512
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | (40,825) | (59,835)
Available-for-sale Securities | 2,547,038 | 2,534,701
Equity securities |  |
Statement [Line Items] |  |
Available-for-sale securities, amortized cost basis | 776 | 12,231
Available-for-sale Securities, Gross Unrealized Gain, Accumulated Investments | 142 | 12,295
Available-for-sale Securities, Gross Unrealized Loss, Accumulated Investments | 0 | 0
Available-for-sale Securities | $ 918 | $ 24,526

X
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