FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Assets:
Single family mortgage servicing rights	$ 74,249,000
Fair Value, Recurring
Assets:
Single family LHFS	12,849,000	$ 14,075,000
Single family LHFI	1,280,000	5,868,000
Single family mortgage servicing rights	74,249,000	76,617,000
Total assets	1,375,458,000	1,508,094,000
Liabilities:
Total liabilities	10,783,000	13,280,000
Fair Value, Recurring \| Level 1
Assets:
Single family LHFS	0	0
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	24,830,000	19,233,000
Liabilities:
Total liabilities	3,000	0
Fair Value, Recurring \| Level 2
Assets:
Single family LHFS	12,849,000	14,075,000
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	1,272,828,000	1,404,226,000
Liabilities:
Total liabilities	10,780,000	13,244,000
Fair Value, Recurring \| Level 3
Assets:
Investment securities AFS	1,860,000	2,009,000
Single family LHFS	0	0
Single family LHFI	1,280,000	5,868,000
Single family mortgage servicing rights	74,249,000	76,617,000
Total assets	77,800,000	84,635,000
Liabilities:
Total liabilities	0	36,000
Fair Value, Recurring \| U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	24,698,000	18,997,000
Fair Value, Recurring \| U.S. Treasury securities \| Level 1
Assets:
Trading securities - U.S. Treasury securities	24,698,000	18,997,000
Fair Value, Recurring \| U.S. Treasury securities \| Level 2
Assets:
Trading securities - U.S. Treasury securities	0	0
Fair Value, Recurring \| U.S. Treasury securities \| Level 3
Assets:
Trading securities - U.S. Treasury securities	0	0
Fair Value, Recurring \| Residential
Assets:
Investment securities AFS	183,798,000	197,262,000
Fair Value, Recurring \| Residential \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Residential \| Level 2
Assets:
Investment securities AFS	181,938,000	195,321,000
Fair Value, Recurring \| Residential \| Level 3
Assets:
Investment securities AFS	1,860,000	1,941,000
Fair Value, Recurring \| Commercial
Assets:
Investment securities AFS	47,756,000	56,049,000
Fair Value, Recurring \| Commercial \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Commercial \| Level 2
Assets:
Investment securities AFS	47,756,000	56,049,000
Fair Value, Recurring \| Commercial \| Level 3
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Residential
Assets:
Investment securities AFS	439,738,000	553,039,000
Fair Value, Recurring \| Residential \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Residential \| Level 2
Assets:
Investment securities AFS	439,738,000	553,039,000
Fair Value, Recurring \| Residential \| Level 3
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Commercial
Assets:
Investment securities AFS	57,397,000	70,519,000
Fair Value, Recurring \| Commercial \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Commercial \| Level 2
Assets:
Investment securities AFS	57,397,000	70,519,000
Fair Value, Recurring \| Commercial \| Level 3
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Municipal bonds
Assets:
Investment securities AFS	404,874,000	411,548,000
Fair Value, Recurring \| Municipal bonds \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Municipal bonds \| Level 2
Assets:
Investment securities AFS	404,874,000	411,548,000
Fair Value, Recurring \| Municipal bonds \| Level 3
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Corporate debt securities
Assets:
Investment securities AFS	38,547,000	42,945,000
Fair Value, Recurring \| Corporate debt securities \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Corporate debt securities \| Level 2
Assets:
Investment securities AFS	38,547,000	42,877,000
Fair Value, Recurring \| Corporate debt securities \| Level 3
Assets:
Investment securities AFS	0	68,000
Fair Value, Recurring \| U.S. Treasury securities
Assets:
Investment securities AFS	20,184,000	19,934,000
Fair Value, Recurring \| U.S. Treasury securities \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| U.S. Treasury securities \| Level 2
Assets:
Investment securities AFS	20,184,000	19,934,000
Fair Value, Recurring \| U.S. Treasury securities \| Level 3
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Agency debentures
Assets:
Investment securities AFS	58,905,000	27,478,000
Fair Value, Recurring \| Agency debentures \| Level 1
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Agency debentures \| Level 2
Assets:
Investment securities AFS	58,905,000	27,478,000
Fair Value, Recurring \| Agency debentures \| Level 3
Assets:
Investment securities AFS	0	0
Fair Value, Recurring \| Futures
Assets:
Derivative assets		18,000
Liabilities:
Derivative liabilities	3,000
Fair Value, Recurring \| Futures \| Level 1
Assets:
Derivative assets		18,000
Liabilities:
Derivative liabilities	3,000
Fair Value, Recurring \| Futures \| Level 2
Assets:
Derivative assets	0	0
Fair Value, Recurring \| Futures \| Level 3
Assets:
Derivative assets		0
Liabilities:
Derivative liabilities	0
Fair Value, Recurring \| Options
Assets:
Derivative assets	132,000	218,000
Fair Value, Recurring \| Options \| Level 1
Assets:
Derivative assets	132,000	218,000
Fair Value, Recurring \| Options \| Level 2
Assets:
Derivative assets	0	0
Fair Value, Recurring \| Options \| Level 3
Assets:
Derivative assets		0
Fair Value, Recurring \| Forward sale commitments
Assets:
Derivative assets	151,000	293,000
Liabilities:
Derivative liabilities	288,000	151,000
Fair Value, Recurring \| Forward sale commitments \| Level 1
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Recurring \| Forward sale commitments \| Level 2
Assets:
Derivative assets	151,000	293,000
Liabilities:
Derivative liabilities	288,000	151,000
Fair Value, Recurring \| Forward sale commitments \| Level 3
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Recurring \| Interest rate lock commitments
Assets:
Derivative assets	411,000	141,000
Liabilities:
Derivative liabilities		36,000
Fair Value, Recurring \| Interest rate lock commitments \| Level 1
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities		0
Fair Value, Recurring \| Interest rate lock commitments \| Level 2
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities		0
Fair Value, Recurring \| Interest rate lock commitments \| Level 3
Assets:
Derivative assets	411,000	141,000
Liabilities:
Derivative liabilities		36,000
Fair Value, Recurring \| Interest rate swaps
Assets:
Derivative assets	10,489,000	13,093,000
Liabilities:
Derivative liabilities	10,492,000	13,093,000
Fair Value, Recurring \| Interest rate swaps \| Level 1
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	0	0
Fair Value, Recurring \| Interest rate swaps \| Level 2
Assets:
Derivative assets	10,489,000	13,093,000
Liabilities:
Derivative liabilities	10,492,000	13,093,000
Fair Value, Recurring \| Interest rate swaps \| Level 3
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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