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Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Held-to-maturity securities |  |
Amortized Cost | $ 2,400 | $ 2,400
Estimated Fair Value | 2,400 | 2,400
Carrying Value | 2,400 | 2,400
Available-for-sale securities |  |
Amortized Cost | 4,660,311 | 4,894,428
Gross Unrealized Gains | 60,665 | 68,516
Gross Unrealized Losses | (47,504) | (50,981)
Total investment securities | 4,673,472 | 4,911,963
Assets/Liabilities Measured at Fair Value |  |
Available-for-sale securities |  |
Total investment securities | 4,673,472 | 4,911,963
Carrying Value |  |
Available-for-sale securities |  |
Total investment securities | 4,673,472 | 4,911,963
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 4,363,026 | 4,597,590
Gross Unrealized Gains | 42,842 | 47,960
Gross Unrealized Losses | (40,802) | (45,178)
Residential mortgage-backed securities | Assets/Liabilities Measured at Fair Value |  |
Available-for-sale securities |  |
Total investment securities | 4,365,066 | 4,600,372
Residential mortgage-backed securities | Carrying Value |  |
Available-for-sale securities |  |
Total investment securities | 4,365,066 | 4,600,372
Mortgage-backed securities by Ginnie Mae |  |
Available-for-sale securities |  |
Total investment securities | 1,367,593 | 1,503,774
Mortgage-backed securities by Fannie Mae and Freddie Mac |  |
Available-for-sale securities |  |
Total investment securities | 2,974,777 | 3,072,535
Mortgage-backed securities by non-government entities |  |
Available-for-sale securities |  |
Total investment securities | 22,696 | 24,063
States and political subdivisions |  |
Available-for-sale securities |  |
Amortized Cost | 269,210 | 268,763
Gross Unrealized Gains | 16,567 | 19,131
Gross Unrealized Losses | (6,481) | (5,618)
States and political subdivisions | Assets/Liabilities Measured at Fair Value |  |
Available-for-sale securities |  |
Total investment securities | 279,296 | 282,276
States and political subdivisions | Carrying Value |  |
Available-for-sale securities |  |
Total investment securities | 279,296 | 282,276
Other securities |  |
Held-to-maturity securities |  |
Amortized Cost | 2,400 | 2,400
Estimated Fair Value | 2,400 | 2,400
Carrying Value | 2,400 | 2,400
Other |  |
Available-for-sale securities |  |
Amortized Cost | 28,075 | 28,075
Gross Unrealized Gains | 1,256 | 1,425
Gross Unrealized Losses | (221) | (185)
Other | Assets/Liabilities Measured at Fair Value |  |
Available-for-sale securities |  |
Total investment securities | 29,110 | 29,315
Other | Carrying Value |  |
Available-for-sale securities |  |
Total investment securities | $ 29,110 | $ 29,315

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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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