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Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
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 | 4,289,526 | 4,218,841
Gross Unrealized Gains | 30,887 | 29,343
Gross Unrealized Losses | (52,769) | (70,835)
Total Investment Securities | 4,267,644 | 4,177,349
Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,267,644 | 4,177,349
Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 4,267,644 | 4,177,349
Residential mortgage-backed securities |  |
Available-for-sale securities |  |
Amortized Cost | 4,022,345 | 3,946,144
Gross Unrealized Gains | 19,789 | 18,246
Gross Unrealized Losses | (51,991) | (69,920)
Residential mortgage-backed securities | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,990,143 | 3,894,470
Residential mortgage-backed securities | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 3,990,143 | 3,894,470
Mortgage-backed securities by Ginnie Mae |  |
Available-for-sale securities |  |
Total Investment Securities | 799,348 | 850,033
Mortgage-backed securities by Fannie Mae and Freddie Mac |  |
Available-for-sale securities |  |
Total Investment Securities | 3,190,795 | 3,026,832
Mortgage-backed securities by non-government entities |  |
Available-for-sale securities |  |
Total Investment Securities |  | 17,605
Obligations of states and political subdivisions |  |
Available-for-sale securities |  |
Amortized Cost | 239,106 | 244,622
Gross Unrealized Gains | 10,820 | 10,783
Gross Unrealized Losses | (296) | (433)
Obligations of states and political subdivisions | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 249,630 | 254,972
Obligations of states and political subdivisions | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | 249,630 | 254,972
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
Equity securities |  |
Available-for-sale securities |  |
Amortized Cost | 28,075 | 28,075
Gross Unrealized Gains | 278 | 314
Gross Unrealized Losses | (482) | (482)
Equity securities | Assets/liabilities measured at fair value |  |
Available-for-sale securities |  |
Total Investment Securities | 27,871 | 27,907
Equity securities | Carrying Value |  |
Available-for-sale securities |  |
Total Investment Securities | $ 27,871 | $ 27,907

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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=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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