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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | $ 2,518,371 | $ 2,370,388
Securities Held to Maturity, Gross Unrealized Gains | 51,786 | 21,304
Securities Held to Maturity, Gross Unrealized Losses | 3,358 | 15,841
Securities Held to Maturity, Fair Value | 2,566,799 | 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 | 672 |
Securities Held to Maturity, Gross Unrealized Losses |  | 410
Securities Held to Maturity, Fair Value | 50,672 | 49,590
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 417,911 | 185,890
Securities Held to Maturity, Gross Unrealized Gains | 6,270 | 3,475
Securities Held to Maturity, Gross Unrealized Losses | 430 | 1,166
Securities Held to Maturity, Fair Value | 423,751 | 188,199
Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 983,146 | 1,014,135
Securities Held to Maturity, Gross Unrealized Gains | 34,214 | 15,585
Securities Held to Maturity, Gross Unrealized Losses |  | 1,589
Securities Held to Maturity, Fair Value | 1,017,360 | 1,028,131
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 1,067,314 | 1,120,363
Securities Held to Maturity, Gross Unrealized Gains | 10,630 | 2,244
Securities Held to Maturity, Gross Unrealized Losses | 2,928 | 12,676
Securities Held to Maturity, Fair Value | $ 1,075,016 | $ 1,109,931

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