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INVESTMENT SECURITIES - (Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 99,073 | $ 492,998
Less Than 12 Months, Unrealized Losses | 4,411 | 7,105
Greater Than 12 Months, Fair Value | 290,012 | 17,986
Greater Than 12 Months, Unrealized Losses | 37,535 | 355
Total Fair Value | 389,085 | 510,984
Total Unrealized Losses | 41,946 | 7,460
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 266,275 | 228,892
Less Than 12 Months, Unrealized Losses | 17,832 | 2,721
Greater Than 12 Months, Fair Value | 345,643 | 0
Greater Than 12 Months Or Longer, Unrealized Losses | 30,219 | 0
Total Fair Value | 611,918 | 228,892
Total Unrealized Losses | 48,051 | 2,721
U.S. Government Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 983 | 172,206
Less Than 12 Months, Unrealized Losses | 0 | 2,606
Greater Than 12 Months, Fair Value | 19,189 | 0
Greater Than 12 Months, Unrealized Losses | 1,928 | 0
Total Fair Value | 20,172 | 172,206
Total Unrealized Losses | 1,928 | 2,606
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 177,552 | 113,877
Less Than 12 Months, Unrealized Losses | 11,018 | 1,622
Greater Than 12 Months, Fair Value | 254,181 | 0
Greater Than 12 Months Or Longer, Unrealized Losses | 14,623 | 0
Total Fair Value | 431,733 | 113,877
Total Unrealized Losses | 25,641 | 1,622
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 63,112 | 127,484
Less Than 12 Months, Unrealized Losses | 2,572 | 1,786
Greater Than 12 Months, Fair Value | 113,004 | 17,986
Greater Than 12 Months, Unrealized Losses | 10,291 | 355
Total Fair Value | 176,116 | 145,470
Total Unrealized Losses | 12,863 | 2,141
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 1,425 | 42,122
Less Than 12 Months, Unrealized Losses | 2 | 811
Greater Than 12 Months, Fair Value | 38,760 | 0
Greater Than 12 Months, Unrealized Losses | 6,853 | 0
Total Fair Value | 40,185 | 42,122
Total Unrealized Losses | 6,855 | 811
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 6,594 | 81,832
Less Than 12 Months, Unrealized Losses | 959 | 598
Greater Than 12 Months, Fair Value | 60,458 | 0
Greater Than 12 Months, Unrealized Losses | 10,467 | 0
Total Fair Value | 67,052 | 81,832
Total Unrealized Losses | 11,426 | 598
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 88,723 | 115,015
Less Than 12 Months, Unrealized Losses | 6,814 | 1,099
Greater Than 12 Months, Fair Value | 91,462 | 0
Greater Than 12 Months Or Longer, Unrealized Losses | 15,596 | 0
Total Fair Value | 180,185 | 115,015
Total Unrealized Losses | 22,410 | 1,099
Corporate Debt Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 26,959 |
Less Than 12 Months, Unrealized Losses | 878 |
Greater Than 12 Months, Fair Value | 58,601 |
Greater Than 12 Months, Unrealized Losses | 7,996 |
Total Fair Value | 85,560 |
Total Unrealized Losses | $ 8,874 |
Equity Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value |  | 69,354
Less Than 12 Months, Unrealized Losses |  | 1,304
Greater Than 12 Months, Fair Value |  | 0
Greater Than 12 Months, Unrealized Losses |  | 0
Total Fair Value |  | 69,354
Total Unrealized Losses |  | $ 1,304

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