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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Securities pledged as collateral | $ 1,500,000 | $ 1,800,000 |
Amortized Cost | 2,664,163 | 2,575,719 |
Gross Unrealized Gains | 6,149 | 13,062 |
Gross Unrealized Losses | (77,029) | (40,825) |
Estimated Fair Value | 2,593,283 | 2,547,956 |
U.S. Government-Sponsored Agency Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 26,830 | 5,962 |
Gross Unrealized Gains | 5 | 2 |
Gross Unrealized Losses | (309) | (26) |
Estimated Fair Value | 26,526 | 5,938 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 415,460 | 405,860 |
Gross Unrealized Gains | 2,101 | 5,638 |
Gross Unrealized Losses | (9,865) | (2,549) |
Estimated Fair Value | 407,696 | 408,949 |
Corporate Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 92,411 | 96,353 |
Gross Unrealized Gains | 1,261 | 2,832 |
Gross Unrealized Losses | (1,802) | (1,876) |
Estimated Fair Value | 91,870 | 97,309 |
Collateralized Mortgage Obligations [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 742,282 | 611,927 |
Gross Unrealized Gains | 406 | 491 |
Gross Unrealized Losses | (18,366) | (9,795) |
Estimated Fair Value | 724,322 | 602,623 |
Mortgage-Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 1,035,724 | 1,132,080 |
Gross Unrealized Gains | 2,342 | 3,957 |
Gross Unrealized Losses | (37,102) | (15,241) |
Estimated Fair Value | 1,000,964 | 1,120,796 |
Commercial Mortgage Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 244,046 | 215,351 |
Gross Unrealized Gains | 34 | 0 |
Gross Unrealized Losses | (5,297) | (2,596) |
Estimated Fair Value | 238,783 | 212,755 |
Auction Rate Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 107,410 | 107,410 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (4,288) | (8,742) |
Estimated Fair Value | 103,122 | 98,668 |
Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost |  | 2,574,943 |
Gross Unrealized Gains |  | 12,920 |
Gross Unrealized Losses |  | (40,825) |
Estimated Fair Value |  | 2,547,038 |
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost |  | 776 |
Gross Unrealized Gains |  | 142 |
Gross Unrealized Losses |  | 0 |
Estimated Fair Value |  | $ 918 |
Pooled Trust Preferred Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 11,500 |  | $ 11,500

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