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Investment Securities - Schedule of Investment Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Fair Value |  |
Less than 12 Months | $ 1,423,379 | $ 636,389
12 Months or Longer | 487,129 | 8,829
Total | 1,910,508 | 645,218
Gross Unrealized Losses |  |
Less than 12 Months | 172,828 | 13,239
12 Months or Longer | 124,297 | 401
Total | $ 297,125 | $ 13,640
Number of Securities | security | 1,154 | 161
U.S. Treasury |  |
Fair Value |  |
Less than 12 Months | $ 2,459 | $ 999
12 Months or Longer | 0 | 0
Total | 2,459 | 999
Gross Unrealized Losses |  |
Less than 12 Months | 42 | 1
12 Months or Longer | 0 | 0
Total | $ 42 | $ 1
Number of Securities | security | 5 | 1
U.S. Government-sponsored agency securities |  |
Fair Value |  |
Less than 12 Months | $ 48,940 | $ 68,524
12 Months or Longer | 53,022 | 0
Total | 101,962 | 68,524
Gross Unrealized Losses |  |
Less than 12 Months | 4,973 | 1,545
12 Months or Longer | 12,219 | 0
Total | $ 17,192 | $ 1,545
Number of Securities | security | 16 | 8
State and municipal |  |
Fair Value |  |
Less than 12 Months | $ 1,177,104 | $ 138,187
12 Months or Longer | 108,652 | 505
Total | 1,285,756 | 138,692
Gross Unrealized Losses |  |
Less than 12 Months | 150,096 | 894
12 Months or Longer | 28,630 | 4
Total | $ 178,726 | $ 898
Number of Securities | security | 946 | 103
U.S. Government-sponsored mortgage-backed securities |  |
Fair Value |  |
Less than 12 Months | $ 182,700 | $ 427,687
12 Months or Longer | 325,455 | 8,324
Total | 508,155 | 436,011
Gross Unrealized Losses |  |
Less than 12 Months | 16,910 | 10,791
12 Months or Longer | 83,448 | 397
Total | $ 100,358 | $ 11,188
Number of Securities | security | 177 | 48
Corporate obligations |  |
Fair Value |  |
Less than 12 Months | $ 12,176 | $ 992
12 Months or Longer | 0 | 0
Total | 12,176 | 992
Gross Unrealized Losses |  |
Less than 12 Months | 807 | 8
12 Months or Longer | 0 | 0
Total | $ 807 | $ 8
Number of Securities | security | 10 | 1

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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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