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Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | $ 1,836,592 | $ 332,659
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 112,063 | 1,929
Held to maturity, Losses 12 months or longer, Fair Value | 725,298 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 125,808 | 464
Held to maturity, Total, Fair Value | 2,561,890 | 344,496
Held to maturity, Total, Gross Unrealized Losses | 237,871 | 2,393
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 | 145,893 | 14,837
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 13,245 | 20
Held to maturity, Losses 12 months or longer, Fair Value | 226,499 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 35,799 |
Held to maturity, Total, Fair Value | 372,392 | 14,837
Held to maturity, Total, Gross Unrealized Losses | 49,044 | 20
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held to maturity, Losses less than 12 months, Fair Value | 560,288 | 7,795
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 8,878 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 64,346 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 17,680 |
Held to maturity, Total, Fair Value | 624,634 | 7,795
Held to maturity, Total, Gross Unrealized Losses | 26,558 | 205
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 | 253,661
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 30,515 | 1,499
Held to maturity, Losses 12 months or longer, Fair Value | 270,800 |
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 42,017 |
Held to maturity, Total, Fair Value | 661,946 | 253,661
Held to maturity, Total, Gross Unrealized Losses | 72,532 | 1,499
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 | 56,366
Held to maturity, Losses less than 12 months, Gross Unrealized Losses | 56,899 | 205
Held to maturity, Losses 12 months or longer, Fair Value | 163,653 | 11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses | 30,312 | 464
Held to maturity, Total, Fair Value | 861,480 | 68,203
Held to maturity, Total, Gross Unrealized Losses | 87,211 | $ 669
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, Total, Fair Value | 41,438 |
Held to maturity, Total, Gross Unrealized Losses | $ 2,526 |

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