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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,438,677 | $ 2,312,087
Gross Unrealized Gains | 36,668 | 49,212
Gross Unrealized Losses | (34,853) | (37,928)
Estimated Fair Value | 2,440,492 | 2,323,371
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 23,981 | 33,469
Gross Unrealized Gains | 9,072 | 14,167
Gross Unrealized Losses | (12) | (13)
Estimated Fair Value | 33,041 | 47,623
U.S. Government Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 200
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 200
U.S. Government-Sponsored Agency Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 48,333 | 209
Gross Unrealized Gains | 57 | 5
Gross Unrealized Losses | (130) | 0
Estimated Fair Value | 48,260 | 214
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 231,592 | 238,250
Gross Unrealized Gains | 5,312 | 7,231
Gross Unrealized Losses | (387) | (266)
Estimated Fair Value | 236,517 | 245,215
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 98,756 | 99,016
Gross Unrealized Gains | 3,183 | 5,126
Gross Unrealized Losses | (4,767) | (6,108)
Estimated Fair Value | 97,172 | 98,034
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 931,093 | 917,395
Gross Unrealized Gains | 4,932 | 5,705
Gross Unrealized Losses | (17,793) | (20,787)
Estimated Fair Value | 918,232 | 902,313
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 998,418 | 914,797
Gross Unrealized Gains | 14,112 | 16,978
Gross Unrealized Losses | (3,866) | (2,944)
Estimated Fair Value | 1,008,664 | 928,831
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 106,504 | 108,751
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7,898) | (7,810)
Estimated Fair Value | $ 98,606 | $ 100,941

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