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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value | $ 439,510 | $ 1,836,592
Held to maturity, Losses less than 12 months, Gross unrealized losses | 13,550 | 112,063
Held to maturity, Losses 12 months or longer, Fair value | 1,990,777 | 725,298
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 284,108 | 125,808
Held to maturity, Total, Fair value | 2,430,287 | 2,561,890
Held to maturity, Total, Gross unrealized losses | 297,658 | 237,871
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 | 29,314 | 145,893
Held to maturity, Losses less than 12 months, Gross unrealized losses | 1,310 | 13,245
Held to maturity, Losses 12 months or longer, Fair value | 329,004 | 226,499
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 58,696 | 35,799
Held to maturity, Total, Fair value | 358,318 | 372,392
Held to maturity, Total, Gross unrealized losses | 60,006 | 49,044
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value | 410,196 | 560,288
Held to maturity, Losses less than 12 months, Gross unrealized losses | 12,240 | 8,878
Held to maturity, Losses 12 months or longer, Fair value | 218,545 | 64,346
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 26,828 | 17,680
Held to maturity, Total, Fair value | 628,741 | 624,634
Held to maturity, Total, Gross unrealized losses | 39,068 | 26,558
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value |  | 391,146
Held to maturity, Losses less than 12 months, Gross unrealized losses |  | 30,515
Held to maturity, Losses 12 months or longer, Fair value | 584,996 | 270,800
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 88,902 | 42,017
Held to maturity, Total, Fair value | 584,996 | 661,946
Held to maturity, Total, Gross unrealized losses | 88,902 | 72,532
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value |  | 697,827
Held to maturity, Losses less than 12 months, Gross unrealized losses |  | 56,899
Held to maturity, Losses 12 months or longer, Fair value | 826,028 | 163,653
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 107,231 | 30,312
Held to maturity, Total, Fair value | 826,028 | 861,480
Held to maturity, Total, Gross unrealized losses | 107,231 | 87,211
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value |  | 41,438
Held to maturity, Losses less than 12 months, Gross unrealized losses |  | 2,526
Held to maturity, Losses 12 months or longer, Fair value | 32,204 |
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 2,451 |
Held to maturity, Total, Fair value | 32,204 | 41,438
Held to maturity, Total, Gross unrealized losses | $ 2,451 | $ 2,526

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