SECURITIES - Securities with Unrealized Losses Segregated by the Period in a Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
SECURITIES [Abstract]
Less than 12 months, Fair Value	$ 65,624	$ 73,696
Less than 12 months, Unrealized Loss	204	215
12 months or more, Fair Value	481,163	501,758
12 months or more, Unrealized Loss	75,362	91,560
Total, Fair Value	546,787	575,454
Total, Unrealized Loss	75,566	91,775
State and Municipal [Member]
SECURITIES [Abstract]
Less than 12 months, Fair Value	205	205
Less than 12 months, Unrealized Loss	0	1
12 months or more, Fair Value	164,102	171,306
12 months or more, Unrealized Loss	25,617	26,291
Total, Fair Value	164,307	171,511
Total, Unrealized Loss	25,617	26,292
Residential Mortgage-backed Securities [Member]
SECURITIES [Abstract]
Less than 12 months, Fair Value	0	8
Less than 12 months, Unrealized Loss	0	0
12 months or more, Fair Value	255,160	264,088
12 months or more, Unrealized Loss	44,427	56,925
Total, Fair Value	255,160	264,096
Total, Unrealized Loss	44,427	56,925
Commercial Mortgage-backed Securities [Member]
SECURITIES [Abstract]
Less than 12 months, Fair Value	1,976	0
Less than 12 months, Unrealized Loss	7	0
12 months or more, Fair Value	41,321	40,360
12 months or more, Unrealized Loss	4,281	6,241
Total, Fair Value	43,297	40,360
Total, Unrealized Loss	4,288	6,241
Commercial Collateralized Mortgage Obligations [Member]
SECURITIES [Abstract]
Less than 12 months, Fair Value	63,443	73,483
Less than 12 months, Unrealized Loss	197	214
12 months or more, Fair Value	0	0
12 months or more, Unrealized Loss	0	0
Total, Fair Value	63,443	73,483
Total, Unrealized Loss	197	214
Asset-backed and Other Amortizing Securities [Member]
SECURITIES [Abstract]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Loss	0	0
12 months or more, Fair Value	13,705	14,581
12 months or more, Unrealized Loss	912	1,526
Total, Fair Value	13,705	14,581
Total, Unrealized Loss	912	1,526
Other Securities [Member]
SECURITIES [Abstract]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Loss	0	0
12 months or more, Fair Value	6,875	11,423
12 months or more, Unrealized Loss	125	577
Total, Fair Value	6,875	11,423
Total, Unrealized Loss	$ 125	$ 577