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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Changes in each component of AOCI, net of tax
Beginning balance	$ 568,874	$ 557,376	$ 538,385	$ 518,647	$ 507,203	$ 503,815	$ 538,385	$ 503,815
Other comprehensive income	9,602	1,907	10,857	18,177	1,632	(1,727)	22,366	18,082
Ending balance	588,066	568,874	557,376	543,725	518,647	507,203	588,066	543,725
Investment Securities
Changes in each component of AOCI, net of tax
Beginning balance	(106,060)		(121,491)	(130,248)		(127,922)	(121,491)	(127,922)
Other comprehensive income (loss) before reclassifications	8,670			19,942			21,653	15,036
Reclassification adjustments from AOCI	1,361			1,413			3,809	3,993
Other comprehensive income	10,031			21,355			25,462	19,029
Ending balance	(96,029)	(106,060)		(108,893)	(130,248)		(96,029)	(108,893)
Derivatives
Changes in each component of AOCI, net of tax
Beginning balance	3,827		6,494	7,260		5,029	6,494	5,029
Other comprehensive income (loss) before reclassifications	(429)			(3,177)			(3,096)	946
Reclassification adjustments from AOCI	0			0			0	0
Other comprehensive income	(429)			(3,177)			(3,096)	(946)
Ending balance	3,398	3,827		4,083	7,260		3,398	4,083
SERP
Changes in each component of AOCI, net of tax
Beginning balance	575		575	297		297	575	297
Other comprehensive income (loss) before reclassifications	0			0			0	0
Reclassification adjustments from AOCI	0			(1)			0	(1)
Other comprehensive income	0			(1)			0	(1)
Ending balance	575	575		296	297		575	296
Accum. Other Comp. Loss
Changes in each component of AOCI, net of tax
Beginning balance	(101,658)	(103,565)	(114,422)	(122,691)	(124,323)	(122,596)	(114,422)	(122,596)
Other comprehensive income (loss) before reclassifications	8,241			16,765			18,557	14,090
Reclassification adjustments from AOCI	1,361			1,412			3,809	3,992
Other comprehensive income	9,602	1,907	10,857	18,177	1,632	(1,727)	22,366	18,082
Ending balance	$ (92,056)	$ (101,658)	$ (103,565)	$ (104,514)	$ (122,691)	$ (124,323)	$ (92,056)	$ (104,514)

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