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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | $ 2,428,432 | $ 2,370,388
Securities Held to Maturity, Gross Unrealized Gains | 57,009 | 21,304
Securities Held to Maturity, Gross Unrealized Losses | 2,901 | 15,841
Securities Held to Maturity, Fair Value | 2,482,540 | 2,375,851
US Treasury and Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 50,000 | 50,000
Securities Held to Maturity, Gross Unrealized Gains | 860 |
Securities Held to Maturity, Gross Unrealized Losses |  | 410
Securities Held to Maturity, Fair Value | 50,860 | 49,590
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 541,839 | 185,890
Securities Held to Maturity, Gross Unrealized Gains | 11,182 | 3,475
Securities Held to Maturity, Gross Unrealized Losses | 1,462 | 1,166
Securities Held to Maturity, Fair Value | 551,559 | 188,199
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 903,703 | 1,014,135
Securities Held to Maturity, Gross Unrealized Gains | 36,200 | 15,585
Securities Held to Maturity, Gross Unrealized Losses |  | 1,589
Securities Held to Maturity, Fair Value | 939,903 | 1,028,131
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 932,890 | 1,120,363
Securities Held to Maturity, Gross Unrealized Gains | 8,767 | 2,244
Securities Held to Maturity, Gross Unrealized Losses | 1,439 | 12,676
Securities Held to Maturity, Fair Value | $ 940,218 | $ 1,109,931

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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