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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Securities pledged as collateral | $ 1,800,000 | $ 0 |
Amortized Cost | 2,655,314 | 2,575,719 |
Gross Unrealized Gains | 8,026 | 13,062 |
Gross Unrealized Losses | (70,517) | (40,825) |
Estimated Fair Value | 2,592,823 | 2,547,956 |
U.S. Government-Sponsored Agency Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 21,105 | 5,962 |
Gross Unrealized Gains | 40 | 2 |
Gross Unrealized Losses | (183) | (26) |
Estimated Fair Value | 20,962 | 5,938 |
State and Municipal Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 413,632 | 405,860 |
Gross Unrealized Gains | 2,247 | 5,638 |
Gross Unrealized Losses | (9,780) | (2,549) |
Estimated Fair Value | 406,099 | 408,949 |
Corporate Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 101,367 | 96,353 |
Gross Unrealized Gains | 2,482 | 2,832 |
Gross Unrealized Losses | (1,894) | (1,876) |
Estimated Fair Value | 101,955 | 97,309 |
Collateralized Mortgage Obligations [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 695,840 | 611,927 |
Gross Unrealized Gains | 236 | 491 |
Gross Unrealized Losses | (16,376) | (9,795) |
Estimated Fair Value | 679,700 | 602,623 |
Mortgage-Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 1,084,582 | 1,132,080 |
Gross Unrealized Gains | 3,006 | 3,957 |
Gross Unrealized Losses | (33,422) | (15,241) |
Estimated Fair Value | 1,054,166 | 1,120,796 |
Commercial Mortgage Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 231,378 | 215,351 |
Gross Unrealized Gains | 15 | 0 |
Gross Unrealized Losses | (4,501) | (2,596) |
Estimated Fair Value | 226,892 | 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 | (4,361) | (8,742) |
Estimated Fair Value | 103,049 | 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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