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Securities - Unrealized Losses on Available-for-Sale of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 138,367 | $ 428,669
12 Months or Longer | 1,439,437 | 1,160,723
Total | 1,577,804 | 1,589,392
Unrealized Losses |  |
Less than 12 Months | 3,181 | 30,152
12 Months or Longer | 206,413 | 206,692
Total | 209,594 | 236,844
U.S. Treasuries |  |
Fair Value |  |
Less than 12 Months | 0 | 28,602
12 Months or Longer | 170,814 | 138,649
Total | 170,814 | 167,251
Unrealized Losses |  |
Less than 12 Months | 0 | 2,132
12 Months or Longer | 19,406 | 20,787
Total | 19,406 | 22,919
Obligations of U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 95,536 | 143,794
12 Months or Longer | 504,226 | 457,373
Total | 599,762 | 601,167
Unrealized Losses |  |
Less than 12 Months | 1,931 | 7,508
12 Months or Longer | 69,286 | 72,517
Total | 71,217 | 80,025
Obligations of U.S. states and political subdivisions |  |
Fair Value |  |
Less than 12 Months | 20,397 | 46,638
12 Months or Longer | 58,598 | 33,435
Total | 78,995 | 80,073
Unrealized Losses |  |
Less than 12 Months | 306 | 2,385
12 Months or Longer | 5,936 | 5,941
Total | 6,242 | 8,326
U.S. Government agencies |  |
Fair Value |  |
Less than 12 Months | 5,484 | 22,945
12 Months or Longer | 45,046 | 29,356
Total | 50,530 | 52,301
Unrealized Losses |  |
Less than 12 Months | 183 | 1,258
12 Months or Longer | 5,164 | 4,813
Total | 5,347 | 6,071
U.S. Government sponsored entities |  |
Fair Value |  |
Less than 12 Months | 16,950 | 186,690
12 Months or Longer | 658,360 | 499,532
Total | 675,310 | 686,222
Unrealized Losses |  |
Less than 12 Months | 761 | 16,869
12 Months or Longer | 106,514 | 102,512
Total | 107,275 | 119,381
U.S. corporate debt securities |  |
Fair Value |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 2,393 | 2,378
Total | 2,393 | 2,378
Unrealized Losses |  |
Less than 12 Months | 0 | 0
12 Months or Longer | 107 | 122
Total | $ 107 | $ 122

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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