FAIR VALUE - Summary of assets measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Guarantee asset
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net income available to common shareholders	Net income available to common shareholders
Corporate bonds
Guarantee asset
Balance at beginning of period		$ 2,113
Loans Held at Fair Value
Guarantee asset
Balance at beginning of period		0
FSC
Guarantee asset
Balance at beginning of period		(9)
Guarantee Asset
Guarantee asset
Balance at beginning of period		237
IRLC
Guarantee asset
Balance at beginning of period		1,473
Equity Warrants
Guarantee asset
Balance at beginning of period		160
Significant Unobservable Inputs (Level 3) | Corporate bonds
Guarantee asset
Acquisitions		4,000
Transfer to held-to-maturity		(6,215)
Significant Unobservable Inputs (Level 3) | FSC
Guarantee asset
Acquisitions		9
Gains/(losses) in net income, net		0
Significant Unobservable Inputs (Level 3) | Guarantee Asset
Guarantee asset
Originations		1
Gains/(losses) in net income, net		(75)
Significant Unobservable Inputs (Level 3) | IRLC
Guarantee asset
Acquisitions		3,213
Originations		(5,048)
Gains/(losses) in net income, net		591
Significant Unobservable Inputs (Level 3) | Equity Warrants
Guarantee asset
Acquisitions		344
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Corporate bonds
Guarantee asset
Balance at beginning of period	$ 0
Unrealized gains, net		102
Balance at end of period	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Loans Held at Fair Value
Guarantee asset
Balance at beginning of period	23,321
Acquisitions	1,173	35,616
Gains/(losses) in net income, net	(309)	(94)
Net charge-offs	(1,700)
Settlements	(8,759)	(12,201)
Balance at end of period	13,726	23,321
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | FSC
Guarantee asset
Balance at beginning of period	0
Balance at end of period	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Guarantee Asset
Guarantee asset
Balance at beginning of period	143
Originations	32
Gains/(losses) in net income, net	38
Settlements	(24)	(20)
Balance at end of period	189	143
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | IRLC
Guarantee asset
Balance at beginning of period	229
Acquisitions	1,997
Originations	(3,272)
Gains/(losses) in net income, net	1,391
Balance at end of period	345	229
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Equity Warrants
Guarantee asset
Balance at beginning of period	825
Gains/(losses) in net income, net	(30)	321
Balance at end of period	$ 795	$ 825