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INVESTMENT SECURITIES - Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 492,998 | $ 28,266
Less Than 12 Months, Unrealized Losses | 7,105 | 156
Greater Than 12 Months, Fair Value | 17,986 | 4,670
Greater Than 12 Months, Unrealized Losses | 355 | 28
Total Fair Value | 510,984 | 32,936
Total Unrealized Losses | 7,460 | 184
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 228,892 |
Less Than 12 Months, Unrealized Losses | 2,721 |
Greater Than 12 Months, Fair Value | 0 |
Greater Than 12 Months Or Longer, Unrealized Losses | 0 |
Total Fair Value | 228,892 |
Total Unrealized Losses | 2,721 |
U.S. Government Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 172,206 |
Less Than 12 Months, Unrealized Losses | 2,606 |
Greater Than 12 Months, Fair Value | 0 |
Greater Than 12 Months, Unrealized Losses | 0 |
Total Fair Value | 172,206 |
Total Unrealized Losses | 2,606 |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 113,877 |
Less Than 12 Months, Unrealized Losses | 1,622 |
Greater Than 12 Months, Fair Value | 0 |
Greater Than 12 Months Or Longer, Unrealized Losses | 0 |
Total Fair Value | 113,877 |
Total Unrealized Losses | 1,622 |
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 127,484 | 28,266
Less Than 12 Months, Unrealized Losses | 1,786 | 156
Greater Than 12 Months, Fair Value | 17,986 | 4,670
Greater Than 12 Months, Unrealized Losses | 355 | 28
Total Fair Value | 145,470 | 32,936
Total Unrealized Losses | 2,141 | $ 184
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 42,122 |
Less Than 12 Months, Unrealized Losses | 811 |
Greater Than 12 Months, Fair Value | 0 |
Greater Than 12 Months, Unrealized Losses | 0 |
Total Fair Value | 42,122 |
Total Unrealized Losses | 811 |
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 81,832 |
Less Than 12 Months, Unrealized Losses | 598 |
Greater Than 12 Months, Fair Value | 0 |
Greater Than 12 Months, Unrealized Losses | 0 |
Total Fair Value | 81,832 |
Total Unrealized Losses | 598 |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 115,015 |
Less Than 12 Months, Unrealized Losses | 1,099 |
Greater Than 12 Months, Fair Value | 0 |
Greater Than 12 Months Or Longer, Unrealized Losses | 0 |
Total Fair Value | 115,015 |
Total Unrealized Losses | 1,099 |
Corporate Debt 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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