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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 7,229,014 | $ 7,079,287
Investment securities available for sale | 7,180,180 | 7,006,580
Investment securities held to maturity |  |
Investment securities held to maturity | 76 | 98
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 808,768 | 842,798
Maturing in one through five years, cost | 849,642 | 848,168
Maturing in five through ten years, cost | 59,414 | 49,367
Maturing in over ten years, cost | 7,645 | 7,615
Maturing in one year or less, fair value | 808,301 | 842,947
Maturing in one through five years, fair value | 849,563 | 847,770
Maturing in five through ten years, fair value | 59,963 | 49,562
Maturing in over ten years, fair value | 7,719 | 7,369
Equity Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 75,471 | 71,873
Investment securities available for sale | 105,208 | 83,507
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 5,428,074 | 5,259,466
Investment securities available for sale | 5,349,426 | 5,175,425
Investment securities held to maturity |  |
Investment securities held to maturity | 76 | 98
Fair Value | $ 81 | $ 104

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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