SECURITIES - Summary of Available For Sale Securities With Unrealized And Unrecognized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Less than 12 Months	$ 334,317	$ 62,339
Fair Value, 12 Months or Longer	7,778	3,973
Fair Value, Total	342,095	66,312
Unrealized Losses, Less than 12 Months	3,746	444
Unrealized Losses, 12 Months or Longer	291	41
Unrealized Losses, Total	4,037	485
U.S Treasury
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Less than 12 Months	10,888	0
Fair Value, 12 Months or Longer	0	0
Fair Value, Total	10,888	0
Unrealized Losses, Less than 12 Months	54	0
Unrealized Losses, 12 Months or Longer	0	0
Unrealized Losses, Total	54	0
Obligations of U.S. government agencies and sponsored entities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Less than 12 Months	9,112	6,593
Fair Value, 12 Months or Longer	522	326
Fair Value, Total	9,634	6,919
Unrealized Losses, Less than 12 Months	52	65
Unrealized Losses, 12 Months or Longer	3	2
Unrealized Losses, Total	55	67
Tax-exempt and taxable obligations of states and municipal subdivisions
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Less than 12 Months	129,571	10,193
Fair Value, 12 Months or Longer	5,053	0
Fair Value, Total	134,624	10,193
Unrealized Losses, Less than 12 Months	1,938	300
Unrealized Losses, 12 Months or Longer	258	0
Unrealized Losses, Total	2,196	300
Mortgage-backed securities - residential
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Less than 12 Months	128,546	30,202
Fair Value, 12 Months or Longer	502	11
Fair Value, Total	129,048	30,213
Unrealized Losses, Less than 12 Months	1,091	42
Unrealized Losses, 12 Months or Longer	7	0
Unrealized Losses, Total	1,098	42
Mortgage-backed securities - commercial
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Less than 12 Months	56,200	10,134
Fair Value, 12 Months or Longer	1,660	3,596
Fair Value, Total	57,860	13,730
Unrealized Losses, Less than 12 Months	611	29
Unrealized Losses, 12 Months or Longer	16	31
Unrealized Losses, Total	627	60
Corporate obligations
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value, Less than 12 Months	0	5,217
Fair Value, 12 Months or Longer	41	40
Fair Value, Total	41	5,257
Unrealized Losses, Less than 12 Months	0	8
Unrealized Losses, 12 Months or Longer	7	8
Unrealized Losses, Total	$ 7	$ 16