SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025
Other comprehensive income/(loss):
Other comprehensive loss before tax	$ (4,004)		$ (20,072)		$ (40,020)	$ (6,984)
Provision (Benefit)
Other comprehensive income/(loss), provision (benefit)	(841)		(4,215)		(8,404)	(1,466)
After Tax
Other comprehensive income/(loss) before reclassifications	(1,894)		(13,121)		(28,084)	482
Less reclassification adjustments, provision (benefit)	(1,269)		(2,736)		(3,532)	(6,000)
Other comprehensive loss net of tax	(3,163)	$ (28,453)	(15,857)	$ 10,339	(31,616)	(5,518)
Available-for-Sale Securities
Other comprehensive income/(loss):
Unrealized gains /(losses) , before tax	(5,696)		(14,844)		(41,298)	6,921
Other comprehensive loss before tax	(5,698)		(14,847)		(41,302)	6,915
Provision (Benefit)
Unrealized gains/ (losses), provision (benefit)	(1,196)		(3,117)		(8,672)	1,454
Other comprehensive income/(loss), provision (benefit)	(1,196)		(3,118)		(8,672)	1,453
After Tax
Other comprehensive income/(loss) before reclassifications	(4,500)		(11,727)		(32,626)	5,467
Less reclassification adjustments, provision (benefit)	(2)		(2)		(4)	(5)
Other comprehensive loss net of tax	(4,502)		(11,729)		(32,630)	5,462
Available-for-Sale Securities | Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	(2)		(3)		(4)	(6)
Provision (Benefit)
Less reclassification adjustments, provision (benefit)	0		(1)		0	(1)
After Tax
Less reclassification adjustments, provision (benefit)	(2)		(2)		(4)	(5)
Held-to-Maturity Securities
Other comprehensive income/(loss):
Less reclassification adjustments, before tax	855		285		463	(18)
Other comprehensive loss before tax	855		285		463	(18)
Provision (Benefit)
Less reclassification adjustments, provision (benefit)	179		60		96	(4)
Other comprehensive income/(loss), provision (benefit)	179		60		96	(4)
After Tax
Other comprehensive income/(loss) before reclassifications	0		0		0	0
Less reclassification adjustments, provision (benefit)	676		225		367	(14)
Other comprehensive loss net of tax	676		225		367	(14)
Cash Flow Hedges
Other comprehensive income/(loss):
Unrealized gains /(losses) , before tax	3,299		(1,764)		5,749	(6,310)
Less reclassification adjustments, before tax	(2,460)		(3,746)		(4,930)	(7,571)
Other comprehensive loss before tax	839		(5,510)		819	(13,881)
Provision (Benefit)
Unrealized gains/ (losses), provision (benefit)	693		(370)		1,207	(1,325)
Less reclassification adjustments, provision (benefit)	(517)		(787)		(1,035)	(1,590)
Other comprehensive income/(loss), provision (benefit)	176		(1,157)		172	(2,915)
After Tax
Other comprehensive income/(loss) before reclassifications	2,606		(1,394)		4,542	(4,985)
Less reclassification adjustments, provision (benefit)	(1,943)		(2,959)		(3,895)	(5,981)
Other comprehensive loss net of tax	$ 663		$ (4,353)		$ 647	$ (10,966)