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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |
Securities pledged as collateral | $ 1,900,000 | $ 1,800,000 |
Amortized Cost | 2,576,201 | 2,594,255 |
Gross Unrealized Gains | 20,665 | 24,807 |
Gross Unrealized Losses | (35,350) | (59,835) |
Estimated Fair Value | 2,561,516 | 2,559,227 |
Other Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale Securities, Equity Securities | 1,000 | 1,000 |
U.S. Government-Sponsored Agency Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 5,961 | 132 |
Gross Unrealized Gains | 54 | 2 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 6,015 | 134 |
State and Municipal Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 415,313 | 405,274 |
Gross Unrealized Gains | 4,005 | 2,043 |
Gross Unrealized Losses | (5,405) | (15,676) |
Estimated Fair Value | 413,913 | 391,641 |
Corporate Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 92,355 | 112,016 |
Gross Unrealized Gains | 2,578 | 1,978 |
Gross Unrealized Losses | (1,956) | (4,585) |
Estimated Fair Value | 92,977 | 109,409 |
Collateralized Mortgage Obligations [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 601,845 | 604,095 |
Gross Unrealized Gains | 1,380 | 1,943 |
Gross Unrealized Losses | (9,547) | (12,178) |
Estimated Fair Value | 593,678 | 593,860 |
Mortgage-Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 1,184,797 | 1,328,192 |
Gross Unrealized Gains | 5,850 | 6,546 |
Gross Unrealized Losses | (8,561) | (16,900) |
Estimated Fair Value | 1,182,086 | 1,317,838 |
Commercial Mortgage Backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 161,960 | 25,100 |
Gross Unrealized Gains | 299 | 0 |
Gross Unrealized Losses | (627) | (537) |
Estimated Fair Value | 161,632 | 24,563 |
Auction Rate Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 107,410 | 107,215 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (9,254) | (9,959) |
Estimated Fair Value | 98,156 | 97,256 |
Debt Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 2,569,641 | 2,582,024 |
Gross Unrealized Gains | 14,166 | 12,512 |
Gross Unrealized Losses | (35,350) | (59,835) |
Estimated Fair Value | 2,548,457 | 2,534,701 |
Equity Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost | 6,560 | 12,231 |
Gross Unrealized Gains | 6,499 | 12,295 |
Gross Unrealized Losses | 0 | 0 |
Estimated Fair Value | 13,059 | $ 24,526 |
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 | $ 10,000 |  | $ 10,000

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