SECURITIES - Schedule of Available For Sale of Securities Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities
Less than 12 months, Fair Value	$ 629,306	$ 26,724
12 months or more, Fair Value	0	3,112
Total Fair Value	629,306	29,836
Less than 12 Months, Unrealized Losses	11,480	89
12 Months or more, Unrealized Losses	0	17
Total Unrealized Losses	11,480	106
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Less than 12 months, Fair Value	106,441	19,800
12 months or more, Fair Value	0	0
Total Fair Value	106,441	19,800
Less than 12 Months, Unrealized Losses	2,237	61
12 Months or more, Unrealized Losses	0	0
Total Unrealized Losses	2,237	61
Mortgage-backed securities: residential
Schedule of Available-for-sale Securities
Less than 12 months, Fair Value	245,919	3
12 months or more, Fair Value	0	3,112
Total Fair Value	245,919	3,115
Less than 12 Months, Unrealized Losses	4,066	0
12 Months or more, Unrealized Losses	0	17
Total Unrealized Losses	4,066	17
Mortgage-backed securities: commercial
Schedule of Available-for-sale Securities
Less than 12 months, Fair Value	65	0
12 months or more, Fair Value	0	0
Total Fair Value	65	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or more, Unrealized Losses	0	0
Total Unrealized Losses	0	0
State and municipal securities
Schedule of Available-for-sale Securities
Less than 12 months, Fair Value	276,881	6,921
12 months or more, Fair Value	0	0
Total Fair Value	276,881	6,921
Less than 12 Months, Unrealized Losses	5,177	28
12 Months or more, Unrealized Losses	0	0
Total Unrealized Losses	$ 5,177	$ 28