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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | $ 8,750 | $ 401,593
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 63 | 2,660
Held to Maturity, Losses 12 months or longer, Fair Value | 1,578,313 | 1,720,624
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 22,935 | 46,813
Held to Maturity, Total, Fair Value | 1,587,063 | 2,122,217
Held to Maturity, Total, Gross Unrealized Losses | 22,998 | 49,473
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 | 49,682 | 49,521
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 317 | 478
Held to Maturity, Total, Fair Value | 49,682 | 49,521
Held to Maturity, Total, Gross Unrealized Losses | 317 | 478
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value | 8,750 | 233,469
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 63 | 2,256
Held to Maturity, Losses 12 months or longer, Fair Value | 169,931 | 233,280
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 1,663 | 7,247
Held to Maturity, Total, Fair Value | 178,681 | 466,749
Held to Maturity, Total, Gross Unrealized Losses | 1,726 | 9,503
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
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses |  | 123
Held to Maturity, Losses 12 months or longer, Fair Value | 186,221 | 235,251
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 3,148 | 5,994
Held to Maturity, Total, Fair Value | 186,221 | 325,981
Held to Maturity, Total, Gross Unrealized Losses | 3,148 | 6,117
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses 12 months or longer, Fair Value | 312,296 | 305,419
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 3,780 | 10,882
Held to Maturity, Total, Fair Value | 312,296 | 305,419
Held to Maturity, Total, Gross Unrealized Losses | 3,780 | 10,882
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to Maturity, Losses less than 12 months, Fair Value |  | 77,394
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses |  | 281
Held to Maturity, Losses 12 months or longer, Fair Value | 860,183 | 897,153
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 14,027 | 22,212
Held to Maturity, Total, Fair Value | 860,183 | 974,547
Held to Maturity, Total, Gross Unrealized Losses | $ 14,027 | $ 22,493

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