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INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Available-for-sale securities    
Less Than 12 Months, Fair Value $ 447,688 $ 492,998
Less Than 12 Months, Unrealized Losses 26,533 7,105
Greater Than 12 Months, Fair Value 101,719 17,986
Greater Than 12 Months, Unrealized Losses 5,589 355
Total Fair Value 549,407 510,984
Total Unrealized Losses 32,122 7,460
Held-to-maturity, Debt Securities    
Less Than 12 Months, Fair Value 427,834 228,892
Less Than 12 Months, Unrealized Losses 16,988 2,721
Greater Than 12 Months, Fair Value 10,496 0
Greater Than 12 Months, Unrealized Losses 837 0
Total Fair Value 438,330 228,892
Total Unrealized Losses 17,825 2,721
U.S. Government Treasury [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 117,369 172,206
Less Than 12 Months, Unrealized Losses 6,723 2,606
Greater Than 12 Months, Fair Value 57,638 0
Greater Than 12 Months, Unrealized Losses 3,328 0
Total Fair Value 175,007 172,206
Total Unrealized Losses 10,051 2,606
Held-to-maturity, Debt Securities    
Less Than 12 Months, Fair Value 261,362 113,877
Less Than 12 Months, Unrealized Losses 9,355 1,622
Greater Than 12 Months, Fair Value 0 0
Greater Than 12 Months, Unrealized Losses 0 0
Total Fair Value 261,362 113,877
Total Unrealized Losses 9,355 1,622
U.S. Government Agency [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 122,572 127,484
Less Than 12 Months, Unrealized Losses 5,952 1,786
Greater Than 12 Months, Fair Value 43,637 17,986
Greater Than 12 Months, Unrealized Losses 2,227 355
Total Fair Value 166,209 145,470
Total Unrealized Losses 8,179 2,141
States and Political Subdivisions [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 42,181 42,122
Less Than 12 Months, Unrealized Losses 3,719 811
Greater Than 12 Months, Fair Value 444 0
Greater Than 12 Months, Unrealized Losses 34 0
Total Fair Value 42,625 42,122
Total Unrealized Losses 3,753 811
Mortgage-Backed Securities [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 85,848 81,832
Less Than 12 Months, Unrealized Losses 5,121 598
Greater Than 12 Months, Fair Value 0 0
Greater Than 12 Months, Unrealized Losses 0 0
Total Fair Value 85,848 81,832
Total Unrealized Losses 5,121 598
Held-to-maturity, Debt Securities    
Less Than 12 Months, Fair Value 166,472 115,015
Less Than 12 Months, Unrealized Losses 7,633 1,099
Greater Than 12 Months, Fair Value 10,496 0
Greater Than 12 Months, Unrealized Losses 837 0
Total Fair Value 176,968 115,015
Total Unrealized Losses 8,470 1,099
Corporate Debt Securities [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 79,718 69,354
Less Than 12 Months, Unrealized Losses 5,018 1,304
Greater Than 12 Months, Fair Value 0 0
Greater Than 12 Months, Unrealized Losses 0 0
Total Fair Value 79,718 69,354
Total Unrealized Losses $ 5,018 $ 1,304