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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | $ 401,593 | $ 768,589
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 2,660 | 6,515
Held to maturity, Losses 12 months or longer, Fair Value | 1,720,624 | 1,055,983
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 46,813 | 22,096
Held to maturity, Total, Fair Value | 2,122,217 | 1,824,572
Held to maturity, Total, Gross Unrealized Losses | 49,473 | 28,611
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses 12 months or longer, Fair Value | 49,521 | 49,711
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 478 | 289
Held to maturity, Total, Fair Value | 49,521 | 49,711
Held to maturity, Total, Gross Unrealized Losses | 478 | 289
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 233,469 | 14,603
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 2,256 | 19
Held to maturity, Losses 12 months or longer, Fair Value | 233,280 | 230,960
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 7,247 | 4,226
Held to maturity, Total, Fair Value | 466,749 | 245,563
Held to maturity, Total, Gross Unrealized Losses | 9,503 | 4,245
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 90,730 | 8,815
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 123 | 99
Held to maturity, Losses 12 months or longer, Fair Value | 235,251 | 230,277
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 5,994 | 2,591
Held to maturity, Total, Fair Value | 325,981 | 239,092
Held to maturity, Total, Gross Unrealized Losses | 6,117 | 2,690
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value |  | 174,882
Held to maturity, Losses less than 12 months, Gross Unrealized Losses |  | 744
Held to maturity, Losses 12 months or longer, Fair Value | 305,419 | 72,499
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 10,882 | 3,171
Held to maturity, Total, Fair Value | 305,419 | 247,381
Held to maturity, Total, Gross Unrealized Losses | 10,882 | 3,915
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 77,394 | 570,289
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 281 | 5,653
Held to maturity, Losses 12 months or longer, Fair Value | 897,153 | 472,536
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 22,212 | 11,819
Held to maturity, Total, Fair Value | 974,547 | 1,042,825
Held to maturity, Total, Gross Unrealized Losses | $ 22,493 | $ 17,472

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