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Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 368,901 | $ 2,108,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (36,260) | (256,382)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,037,068 | 477,373
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (443,765) | (89,665)
Debt Securities, Available-for-sale, Unrealized Loss Position | 2,405,969 | 2,585,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (480,025) | (346,047)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 504,922
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (38,304)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 1,019,844 | 620,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (259,889) | (157,903)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,019,844 | 1,125,049
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | (259,889) | (196,207)
US Government Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 96,906
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (2,814)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 222,446 | 121,579
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,798) | (4,841)
Debt Securities, Available-for-sale, Unrealized Loss Position | 222,446 | 218,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (2,798) | (7,655)
US Government Agencies Debt Securities |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 987 | 1,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (54) | (42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 987 | 1,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (54) | (42)
State and Municipal Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 138,638 | 995,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (13,674) | (157,397)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 807,811 | 61,089
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (240,912) | (21,419)
Debt Securities, Available-for-sale, Unrealized Loss Position | 946,449 | 1,056,211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (254,586) | (178,816)
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 118,791 | 376,398
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (10,241) | (31,333)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 300,480 | 37,157
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (41,536) | (6,150)
Debt Securities, Available-for-sale, Unrealized Loss Position | 419,271 | 413,555
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (51,777) | (37,483)
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 10,292 | 113,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,397) | (7,650)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 101,925 | 20,842
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (14,231) | (5,472)
Debt Securities, Available-for-sale, Unrealized Loss Position | 112,217 | 134,033
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (15,628) | (13,122)
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 32,935 | 154,861
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (4,272) | (18,301)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 155,351 | 55,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (34,889) | (11,546)
Debt Securities, Available-for-sale, Unrealized Loss Position | 188,286 | 210,154
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (39,161) | (29,847)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 246,667
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (14,275)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 344,810 | 153,178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (73,552) | (43,205)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 344,810 | 399,845
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | (73,552) | (57,480)
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 67,258 | 371,109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (6,622) | (38,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 449,055 | 181,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (109,399) | (40,237)
Debt Securities, Available-for-sale, Unrealized Loss Position | 516,313 | 552,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (116,021) | (79,082)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 258,255
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | (24,029)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 675,034 | 466,949
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | (186,337) | (114,698)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 675,034 | 725,204
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (186,337) | $ (138,727)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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