GOODWILL, OTHER INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 373,121	$ 373,121
Goodwill, end of period	373,121	373,121
Finite-lived Intangible Assets [Roll Forward]
Intangible Asset, Including Goodwill, after Accumulated Amortization	374,100	374,612	$ 376,179
Amortization	(512)	(1,567)
Core Deposit Intangibles [Member]
Finite-lived Intangible Assets [Roll Forward]
Intangible Asset, Finite-Lived, after Accumulated Amortization	979	1,491	$ 3,058
Amortization	$ (512)	$ (1,567)

Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

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+ Details

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details