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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,424,164 | $ 2,312,087
Gross Unrealized Gains | 38,532 | 49,212
Gross Unrealized Losses | (26,359) | (37,928)
Estimated Fair Value | 2,436,337 | 2,323,371
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 16,087 | 33,469
Gross Unrealized Gains | 7,453 | 14,167
Gross Unrealized Losses | (8) | (13)
Estimated Fair Value | 23,532 | 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 | 48,320 | 209
Gross Unrealized Gains | 231 | 5
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 48,551 | 214
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 234,868 | 238,250
Gross Unrealized Gains | 5,430 | 7,231
Gross Unrealized Losses | (62) | (266)
Estimated Fair Value | 240,236 | 245,215
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 102,297 | 99,016
Gross Unrealized Gains | 2,935 | 5,126
Gross Unrealized Losses | (5,291) | (6,108)
Estimated Fair Value | 99,941 | 98,034
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 879,738 | 917,395
Gross Unrealized Gains | 5,638 | 5,705
Gross Unrealized Losses | (11,077) | (20,787)
Estimated Fair Value | 874,299 | 902,313
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,036,193 | 914,797
Gross Unrealized Gains | 16,845 | 16,978
Gross Unrealized Losses | (1,133) | (2,944)
Estimated Fair Value | 1,051,905 | 928,831
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 106,661 | 108,751
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8,788) | (7,810)
Estimated Fair Value | $ 97,873 | $ 100,941

X
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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