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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Jun. 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 | $ 826,816 | $ 1,836,592
Held to maturity, Losses less than 12 months, Gross unrealized losses | 28,405 | 112,063
Held to maturity, Losses 12 months or longer, Fair value | 1,663,078 | 725,298
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 213,094 | 125,808
Held to maturity, Total, Fair value | 2,489,894 | 2,561,890
Held to maturity, Total, Gross unrealized losses | 241,499 | 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 | 63,206 | 145,893
Held to maturity, Losses less than 12 months, Gross unrealized losses | 3,175 | 13,245
Held to maturity, Losses 12 months or longer, Fair value | 295,332 | 226,499
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 46,230 | 35,799
Held to maturity, Total, Fair value | 358,538 | 372,392
Held to maturity, Total, Gross unrealized losses | 49,405 | 49,044
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair value | 429,205 | 560,288
Held to maturity, Losses less than 12 months, Gross unrealized losses | 5,865 | 8,878
Held to maturity, Losses 12 months or longer, Fair value | 192,626 | 64,346
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 20,696 | 17,680
Held to maturity, Total, Fair value | 621,831 | 624,634
Held to maturity, Total, Gross unrealized losses | 26,561 | 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 | 215,171 | 391,146
Held to maturity, Losses less than 12 months, Gross unrealized losses | 12,457 | 30,515
Held to maturity, Losses 12 months or longer, Fair value | 407,768 | 270,800
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 59,297 | 42,017
Held to maturity, Total, Fair value | 622,939 | 661,946
Held to maturity, Total, Gross unrealized losses | 71,754 | 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 | 119,234 | 697,827
Held to maturity, Losses less than 12 months, Gross unrealized losses | 6,908 | 56,899
Held to maturity, Losses 12 months or longer, Fair value | 731,825 | 163,653
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 84,305 | 30,312
Held to maturity, Total, Fair value | 851,059 | 861,480
Held to maturity, Total, Gross unrealized losses | 91,213 | 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 | 35,527 |
Held to maturity, Losses 12 months or longer, Gross unrealized losses | 2,566 |
Held to maturity, Total, Fair value | 35,527 | 41,438
Held to maturity, Total, Gross unrealized losses | $ 2,566 | $ 2,526

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