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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Losses less than 12 months, Fair Value | $ 51,582 | $ 401,593
Securities Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 105 | 2,660
Securities Held to Maturity, Losses 12 months or longer, Fair Value | 434,583 | 1,720,624
Securities Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 2,459 | 46,813
Securities Held to Maturity, Total, Fair Value | 486,165 | 2,122,217
Securities Held to Maturity, Total, Gross Unrealized Losses | 2,564 | 49,473
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Losses 12 months or longer, Fair Value | 49,954 | 49,521
Securities Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 46 | 478
Securities Held to Maturity, Total, Fair Value | 49,954 | 49,521
Securities Held to Maturity, Total, Gross Unrealized Losses | 46 | 478
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Losses less than 12 months, Fair Value | 3,820 | 233,469
Securities Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 30 | 2,256
Securities Held to Maturity, Losses 12 months or longer, Fair Value | 6,431 | 233,280
Securities Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 65 | 7,247
Securities Held to Maturity, Total, Fair Value | 10,251 | 466,749
Securities Held to Maturity, Total, Gross Unrealized Losses | 95 | 9,503
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Losses less than 12 months, Fair Value |  | 90,730
Securities Held to Maturity, Losses less than 12 months, Gross Unrealized Losses |  | 123
Securities Held to Maturity, Losses 12 months or longer, Fair Value | 122,687 | 235,251
Securities Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 355 | 5,994
Securities Held to Maturity, Total, Fair Value | 122,687 | 325,981
Securities Held to Maturity, Total, Gross Unrealized Losses | 355 | 6,117
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Losses less than 12 months, Fair Value | 29,101 |
Securities Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 10 |
Securities Held to Maturity, Losses 12 months or longer, Fair Value |  | 305,419
Securities Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses |  | 10,882
Securities Held to Maturity, Total, Fair Value | 29,101 | 305,419
Securities Held to Maturity, Total, Gross Unrealized Losses | 10 | 10,882
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Losses less than 12 months, Fair Value | 18,661 | 77,394
Securities Held to Maturity, Losses less than 12 months, Gross Unrealized Losses | 65 | 281
Securities Held to Maturity, Losses 12 months or longer, Fair Value | 255,511 | 897,153
Securities Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses | 1,993 | 22,212
Securities Held to Maturity, Total, Fair Value | 274,172 | 974,547
Securities Held to Maturity, Total, Gross Unrealized Losses | $ 2,058 | $ 22,493

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