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Securities (Amortized Cost and Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | $ 2,497,558 | $ 2,370,388
Securities Held to Maturity, Gross Unrealized Gains | 72,816 | 21,304
Securities Held to Maturity, Gross Unrealized Losses | 1,290 | 15,841
Securities Held to Maturity, Fair Value | 2,569,084 | 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 | 1,047 |
Securities Held to Maturity, Gross Unrealized Losses |  | 410
Securities Held to Maturity, Fair Value | 51,047 | 49,590
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 496,999 | 185,890
Securities Held to Maturity, Gross Unrealized Gains | 18,158 | 3,475
Securities Held to Maturity, Gross Unrealized Losses | 372 | 1,166
Securities Held to Maturity, Fair Value | 514,785 | 188,199
Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 946,722 | 1,014,135
Securities Held to Maturity, Gross Unrealized Gains | 40,068 | 15,585
Securities Held to Maturity, Gross Unrealized Losses |  | 1,589
Securities Held to Maturity, Fair Value | 986,790 | 1,028,131
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total held to maturity securities, Amortized Cost | 1,003,837 | 1,120,363
Securities Held to Maturity, Gross Unrealized Gains | 13,543 | 2,244
Securities Held to Maturity, Gross Unrealized Losses | 918 | 12,676
Securities Held to Maturity, Fair Value | $ 1,016,462 | $ 1,109,931

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