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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 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 | $ 33,161 | $ 401,593
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 619 | 2,660
Held to maturity, Losses 12 months or longer, Fair Value | 52,253 | 1,720,624
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 489 | 46,813
Held to maturity, Total, Fair Value | 85,414 | 2,122,217
Held to maturity, Total, Gross Unrealized Losses | 1,108 | 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 |  | 49,521
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses |  | 478
Held to maturity, Total, Fair Value |  | 49,521
Held to maturity, Total, Gross Unrealized Losses |  | 478
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 4,735 | 233,469
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 38 | 2,256
Held to maturity, Losses 12 months or longer, Fair Value | 3,143 | 233,280
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 31 | 7,247
Held to maturity, Total, Fair Value | 7,878 | 466,749
Held to maturity, Total, Gross Unrealized Losses | 69 | 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 |  | 235,251
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses |  | 5,994
Held to maturity, Total, Fair Value |  | 325,981
Held to maturity, Total, Gross Unrealized Losses |  | 6,117
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 28,426 |
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 581 |
Held to maturity, Losses 12 months or longer, Fair Value |  | 305,419
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses |  | 10,882
Held to maturity, Total, Fair Value | 28,426 | 305,419
Held to maturity, Total, Gross Unrealized Losses | 581 | 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 | 49,110 | 897,153
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 458 | 22,212
Held to maturity, Total, Fair Value | 49,110 | 974,547
Held to maturity, Total, Gross Unrealized Losses | $ 458 | $ 22,493

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