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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 5,381,069 | $ 5,176,615
Unrealized Gains | 2,918 | 1,984
Unrealized Losses | (69,014) | (101,085)
Fair value | 5,314,973 | 5,077,514
U.S. Treasury securities |  |
Available for sale debt securities |  |
Amortized Cost | 404,693 | 405,637
Unrealized Losses | (7,927) | (13,164)
Fair value | 396,766 | 392,473
Government-sponsored enterprises debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 249,711 | 249,707
Unrealized Gains | 26 | 16
Unrealized Losses | (4,599) | (7,056)
Fair value | 245,138 | 242,667
Government agency mortgage-backed securities |  |
Available for sale debt securities |  |
Amortized Cost | 163,289 | 190,485
Unrealized Losses | (3,502) | (4,822)
Fair value | 159,787 | 185,663
Government-sponsored enterprises mortgage-backed securities |  |
Available for sale debt securities |  |
Amortized Cost | 186,957 | 208,034
Unrealized Gains | 234 | 385
Unrealized Losses | (3,052) | (4,034)
Fair value | 184,139 | 204,385
Non-government asset-backed securities |  |
Available for sale debt securities |  |
Amortized Cost | 101 | 12,592
Unrealized Losses |  | (9)
Fair value | 101 | 12,583
Collateralized mortgage obligations: Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 3,551,654 | 3,409,822
Unrealized Gains | 1,129 | 794
Unrealized Losses | (38,879) | (58,794)
Fair value | 3,513,904 | 3,351,822
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 824,664 | 700,338
Unrealized Gains | 1,529 | 789
Unrealized Losses | (11,055) | (13,206)
Fair value | $ 815,138 | $ 687,921

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt 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 Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt 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 (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: 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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