SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value
Total	$ 0
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")
Fair Value
Less than 12 Consecutive Months	904	$ 50,813
12 Consecutive Months or Longer	205,299	190,427
Total	206,203	241,240
Unrealized Losses
Less than 12 Consecutive Months	12	2,010
12 Consecutive Months or Longer	33,294	29,524
Total	33,306	31,534
US Treasury Securities [Member]
Fair Value
12 Consecutive Months or Longer	229,873	227,256
Total	229,873	227,256
Unrealized Losses
12 Consecutive Months or Longer	16,262	19,643
Total	16,262	19,643
State and municipal obligations
Fair Value
Less than 12 Consecutive Months	1,713	10,848
12 Consecutive Months or Longer	26,218	22,681
Total	27,931	33,529
Unrealized Losses
Less than 12 Consecutive Months	137	174
12 Consecutive Months or Longer	2,777	2,847
Total	2,914	3,021
US Government Agencies Debt Securities [Member]
Fair Value
12 Consecutive Months or Longer	9,143
Total	9,143
Unrealized Losses
12 Consecutive Months or Longer	857
Total	857
Corporate Notes
Fair Value
Less than 12 Consecutive Months	19,118	110,707
12 Consecutive Months or Longer	121,969	50,116
Total	141,087	160,823
Unrealized Losses
Less than 12 Consecutive Months	2,248	8,494
12 Consecutive Months or Longer	26,214	8,581
Total	28,462	17,075
Agency collateralized mortgage obligations ("CMOs")
Fair Value
Less than 12 Consecutive Months	2,427	55,924
12 Consecutive Months or Longer	248,193	220,413
Total	250,620	276,337
Unrealized Losses
Less than 12 Consecutive Months	41	3,454
12 Consecutive Months or Longer	55,970	46,603
Total	$ 56,011	$ 50,057