OFFSETTING ASSETS AND LIABILITIES - Offsetting of Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Offsetting Assets [Line Items]
Gross Amount Of Recognized Assets	$ 43,735	$ 20,999
Gross Amount Of Assets Offset In The Balance Sheet	0	0
Net Amount Of Assets Presented In The Balance Sheet	43,735	20,999
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	(12,187)	(6,083)
Net Amount Of Assets	31,548	14,916
Payer Swaption [Member]
Offsetting Assets [Line Items]
Gross Amount Of Recognized Assets	26,282	17,433
Gross Amount Of Assets Offset In The Balance Sheet	0	0
Net Amount Of Assets Presented In The Balance Sheet	26,282	17,433
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	(11,414)	(3,563)
Net Amount Of Assets	14,868	13,870
TBA Contracts [Member]
Offsetting Assets [Line Items]
Gross Amount Of Recognized Assets	875	3,559
Gross Amount Of Assets Offset In The Balance Sheet	0	0
Net Amount Of Assets Presented In The Balance Sheet	875	3,559
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	(773)	(2,520)
Net Amount Of Assets	102	1,039
Swap [Member]
Offsetting Assets [Line Items]
Gross Amount Of Recognized Assets	14,263	7
Gross Amount Of Assets Offset In The Balance Sheet	0	0
Net Amount Of Assets Presented In The Balance Sheet	14,263	7
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	0	0
Net Amount Of Assets	14,263	$ 7
Interest Rate Floor [Member]
Offsetting Assets [Line Items]
Gross Amount Of Recognized Assets	2,315
Gross Amount Of Assets Offset In The Balance Sheet	0
Net Amount Of Assets Presented In The Balance Sheet	2,315
Gross Amounts Of Financial Instruments Received Not Offset In Balance Sheet	0
Gross Amounts Of Cash Collateral Received Not Offset In Balance Sheet	0
Net Amount Of Assets	$ 2,315