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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available for sale debt securities |  |
Amortized Cost | $ 5,056,556 | $ 5,357,275
Unrealized Gains | 109 | 241
Unrealized Losses | (214,114) | (122,858)
Fair value | 4,842,551 | 5,234,658
U.S. Treasury securities |  |
Available for sale debt securities |  |
Amortized Cost | 403,744 | 404,376
Unrealized Losses | (17,687) | (12,121)
Fair value | 386,057 | 392,255
Government-sponsored enterprises debt securities |  |
Available for sale debt securities |  |
Amortized Cost | 249,714 | 249,712
Unrealized Losses | (11,187) | (7,111)
Fair value | 238,527 | 242,601
Government agency mortgage-backed securities |  |
Available for sale debt securities |  |
Amortized Cost | 455,769 | 356,858
Unrealized Losses | (16,919) | (5,468)
Fair value | 438,850 | 351,390
Government-sponsored enterprises mortgage-backed securities |  |
Available for sale debt securities |  |
Amortized Cost | 168,151 | 178,702
Unrealized Gains | 109 | 169
Unrealized Losses | (7,019) | (4,130)
Fair value | 161,241 | 174,741
Collateralized mortgage obligations: Government agency |  |
Available for sale debt securities |  |
Amortized Cost | 3,057,867 | 3,367,173
Unrealized Gains |  | 47
Unrealized Losses | (133,061) | (76,746)
Fair value | 2,924,806 | 3,290,474
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Available for sale debt securities |  |
Amortized Cost | 700,900 | 779,911
Unrealized Gains |  | 25
Unrealized Losses | (27,646) | (17,218)
Fair value | 673,254 | 762,718
States and political subdivisions |  |
Available for sale debt securities |  |
Amortized Cost | 20,411 | 20,543
Unrealized Losses | (595) | (64)
Fair value | $ 19,816 | $ 20,479

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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=82897076&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=82897076&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=82897076&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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