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INVESTMENT SECURITIES - Available-for-Sale Securities Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Estimated Fair Value |  |
Less Than 12 Months | $ 183,951 | $ 688,212
12 Months or More | 246,349 | 27,099
Total | 430,300 | 715,311
Unrealized Losses |  |
Less Than 12 Months | (13,575) | (11,044)
12 Months or More | (44,251) | (865)
Total | (57,826) | (11,909)
U.S. treasury securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 1,377 | 87,302
12 Months or More | 245 | 0
Total | 1,622 | 87,302
Unrealized Losses |  |
Less Than 12 Months | (17) | (1,087)
12 Months or More | (5) | 0
Total | (22) | (1,087)
U.S. agency |  |
Estimated Fair Value |  |
Less Than 12 Months | 3,221 | 10,969
12 Months or More | 1,364 | 0
Total | 4,585 | 10,969
Unrealized Losses |  |
Less Than 12 Months | (257) | (140)
12 Months or More | (193) | 0
Total | (450) | (140)
Asset backed securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 10,780 |
12 Months or More | 19,208 |
Total | 29,988 |
Unrealized Losses |  |
Less Than 12 Months | (319) |
12 Months or More | (1,161) |
Total | (1,480) |
State, county and municipal securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 29,284 | 180,551
12 Months or More | 75,472 | 5,970
Total | 104,756 | 186,521
Unrealized Losses |  |
Less Than 12 Months | (3,629) | (3,131)
12 Months or More | (17,734) | (225)
Total | (21,363) | (3,356)
Corporate debt securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 17,258 | 31,977
12 Months or More | 30,651 | 0
Total | 47,909 | 31,977
Unrealized Losses |  |
Less Than 12 Months | (1,463) | (265)
12 Months or More | (3,857) | 0
Total | (5,320) | (265)
Mortgage-backed securities |  |
Estimated Fair Value |  |
Less Than 12 Months | 122,031 | 377,413
12 Months or More | 119,409 | 21,129
Total | 241,440 | 398,542
Unrealized Losses |  |
Less Than 12 Months | (7,890) | (6,421)
12 Months or More | (21,301) | (640)
Total | $ (29,191) | $ (7,061)

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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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