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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 676,638 | $ 1,836,592
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 18,841 | 112,063
Held to maturity, Losses 12 months or longer, Fair Value | 1,659,916 | 725,298
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 185,274 | 125,808
Held to maturity, Total, Fair Value | 2,336,554 | 2,561,890
Held to maturity, Total, Gross Unrealized Losses | 204,115 | 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 | 49,176 | 145,893
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 2,085 | 13,245
Held to maturity, Losses 12 months or longer, Fair Value | 305,813 | 226,499
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 39,453 | 35,799
Held to maturity, Total, Fair Value | 354,989 | 372,392
Held to maturity, Total, Gross Unrealized Losses | 41,538 | 49,044
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 240,561 | 560,288
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 1,452 | 8,878
Held to maturity, Losses 12 months or longer, Fair Value | 183,368 | 64,346
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 17,810 | 17,680
Held to maturity, Total, Fair Value | 423,929 | 624,634
Held to maturity, Total, Gross Unrealized Losses | 19,262 | 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 | 225,019 | 391,146
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 9,134 | 30,515
Held to maturity, Losses 12 months or longer, Fair Value | 426,955 | 270,800
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 54,392 | 42,017
Held to maturity, Total, Fair Value | 651,974 | 661,946
Held to maturity, Total, Gross Unrealized Losses | 63,526 | 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 | 159,220 | 697,827
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 6,140 | 56,899
Held to maturity, Losses 12 months or longer, Fair Value | 707,420 | 163,653
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 71,513 | 30,312
Held to maturity, Total, Fair Value | 866,640 | 861,480
Held to maturity, Total, Gross Unrealized Losses | 77,653 | 87,211
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 2,662 | 41,438
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 30 | 2,526
Held to maturity, Losses 12 months or longer, Fair Value | 36,360 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 2,106 |
Held to maturity, Total, Fair Value | 39,022 | 41,438
Held to maturity, Total, Gross Unrealized Losses | $ 2,136 | $ 2,526

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