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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | $ 1,361,621 | $ 1,513,235
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 30,057 | 34,152
Held to maturity, Losses 12 months or longer, Fair Value | 111,280 | 127,125
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 3,449 | 3,847
Held to maturity, Total, Fair Value | 1,472,901 | 1,640,360
Held to maturity, Total, Gross Unrealized Losses | 33,506 | 37,999
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 49,946 | 49,956
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 55 | 44
Held to maturity, Total, Fair Value | 49,946 | 49,956
Held to maturity, Total, Gross Unrealized Losses | 55 | 44
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 454,266 | 494,470
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 17,331 | 19,706
Held to maturity, Losses 12 months or longer, Fair Value | 7,269 | 11,750
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 273 | 469
Held to maturity, Total, Fair Value | 461,535 | 506,220
Held to maturity, Total, Gross Unrealized Losses | 17,604 | 20,175
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 279,443 | 278,369
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 1,980 | 3,068
Held to maturity, Total, Fair Value | 279,443 | 278,369
Held to maturity, Total, Gross Unrealized Losses | 1,980 | 3,068
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 71,373 | 71,701
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 4,348 | 4,038
Held to maturity, Total, Fair Value | 71,373 | 71,701
Held to maturity, Total, Gross Unrealized Losses | 4,348 | 4,038
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 506,593 | 618,739
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 6,343 | 7,296
Held to maturity, Losses 12 months or longer, Fair Value | 104,011 | 115,375
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 3,176 | 3,378
Held to maturity, Total, Fair Value | 610,604 | 734,114
Held to maturity, Total, Gross Unrealized Losses | $ 9,519 | $ 10,674

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