INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Number of AFS investment securities in an unrealized loss position | security	220	208
Number of HTM investment securities in an unrealized loss position | security	83	82
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	$ 48,334	$ 19,557
Less Than 12 Months, Unrecognized Losses	(515)	(219)
12 Month or Longer, Fair Value	580,461	588,097
12 Month or Longer, Unrecognized Losses	(114,551)	(108,028)
Total Fair Value	628,795	607,654
Total Unrecognized Losses	115,066	108,247
Schedule of Held-to-Maturity Securities [Line Items]
Less Than 12 Months, Fair Value	16,324	8,853
Less Than 12 Months, Unrecognized Losses	(112)	(33)
12 Month or Longer, Fair Value	525,361	547,631
12 Month or Longer, Unrecognized Losses	(83,151)	(67,188)
Total Fair Value	541,685	556,484
Total Unrecognized Losses	(83,263)	(67,221)
States and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	5,888	534
Less Than 12 Months, Unrecognized Losses	(46)	(1)
12 Month or Longer, Fair Value	111,345	114,601
12 Month or Longer, Unrecognized Losses	(29,332)	(29,809)
Total Fair Value	117,233	115,135
Total Unrecognized Losses	29,378	29,810
Schedule of Held-to-Maturity Securities [Line Items]
Less Than 12 Months, Fair Value	0	0
Less Than 12 Months, Unrecognized Losses	0	0
12 Month or Longer, Fair Value	34,660	35,253
12 Month or Longer, Unrecognized Losses	(7,324)	(6,706)
Total Fair Value	34,660	35,253
Total Unrecognized Losses	(7,324)	(6,706)
Corporate securities
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	0	0
Less Than 12 Months, Unrecognized Losses	0	0
12 Month or Longer, Fair Value	31,398	31,414
12 Month or Longer, Unrecognized Losses	(4,213)	(4,317)
Total Fair Value	31,398	31,414
Total Unrecognized Losses	4,213	4,317
U.S. Treasury and other government-sponsored entities and agencies
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	6,813	2,893
Less Than 12 Months, Unrecognized Losses	(57)	(87)
12 Month or Longer, Fair Value	16,134	16,286
12 Month or Longer, Unrecognized Losses	(2,033)	(1,854)
Total Fair Value	22,947	19,179
Total Unrecognized Losses	2,090	1,941
Residential - U.S. government-sponsored entities and agencies
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	9,802	0
Less Than 12 Months, Unrecognized Losses	(56)	0
12 Month or Longer, Fair Value	334,758	367,887
12 Month or Longer, Unrecognized Losses	(62,757)	(63,607)
Total Fair Value	344,560	367,887
Total Unrecognized Losses	62,813	63,607
Schedule of Held-to-Maturity Securities [Line Items]
Less Than 12 Months, Fair Value	16,324	8,853
Less Than 12 Months, Unrecognized Losses	(112)	(33)
12 Month or Longer, Fair Value	490,701	512,378
12 Month or Longer, Unrecognized Losses	(75,827)	(60,482)
Total Fair Value	507,025	521,231
Total Unrecognized Losses	(75,939)	(60,515)
Residential - Non-government agencies
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	5,709	0
Less Than 12 Months, Unrecognized Losses	(82)	0
12 Month or Longer, Fair Value	8,020	8,169
12 Month or Longer, Unrecognized Losses	(999)	(980)
Total Fair Value	13,729	8,169
Total Unrecognized Losses	1,081	980
Commercial - U.S. government-sponsored entities and agencies
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	20,122	6,467
Less Than 12 Months, Unrecognized Losses	(274)	(1)
12 Month or Longer, Fair Value	63,757	44,447
12 Month or Longer, Unrecognized Losses	(15,060)	(7,403)
Total Fair Value	83,879	50,914
Total Unrecognized Losses	15,334	7,404
Commercial - Non-government agencies
Debt Securities, Available-for-Sale [Line Items]
Less than 12 months, Fair Value	0	9,663
Less Than 12 Months, Unrecognized Losses	0	(130)
12 Month or Longer, Fair Value	15,049	5,293
12 Month or Longer, Unrecognized Losses	(157)	(58)
Total Fair Value	15,049	14,956
Total Unrecognized Losses	$ 157	$ 188