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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Investment securities AFS	$ 1,287,727	$ 1,002,522
Single family mortgage servicing rights	77,811
Derivatives	1,342	9,280
Liabilities:
Derivative liabilities	14,378	1,263
Residential mortgage-backed securities
Assets:
Investment securities AFS	198,990	32,963
Commercial mortgage-backed securities
Assets:
Investment securities AFS	58,872	62,792
Municipal bonds
Assets:
Investment securities AFS	428,197	539,923
Corporate debt securities
Assets:
Investment securities AFS	33,762	19,616
U.S. Treasury securities
Assets:
Investment securities AFS	19,827	23,175
Agency debentures
Assets:
Investment securities AFS	4,004
Recurring
Assets:
Single family LHFS	13,308	128,041
Single family LHFI	5,850	7,287
Single family mortgage servicing rights	77,811	61,584
Total assets	1,422,805	1,207,359
Liabilities:
Total liabilities	15,601	5,184
Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	198,990	32,963
Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	58,872	62,792
Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	453,214	187,394
Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	90,861	136,659
Recurring | Municipal bonds
Assets:
Investment securities AFS	428,197	539,923
Recurring | Corporate debt securities
Assets:
Investment securities AFS	33,762	19,616
Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	21,115
Investment securities AFS	19,827	23,175
Recurring | Agency debentures
Assets:
Investment securities AFS	4,004
Recurring | Futures
Assets:
Derivatives	46	334
Recurring | Forward sale commitments
Assets:
Derivatives	2,756	723
Liabilities:
Derivative liabilities	1,434	640
Recurring | Options
Assets:
Derivatives	385
Recurring | Interest rate lock commitments
Assets:
Derivatives	48	2,487
Liabilities:
Derivative liabilities	408	3
Recurring | Interest rate swaps
Assets:
Derivatives	13,759	4,381
Liabilities:
Derivative liabilities	13,759	4,541
Level 1 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	21,546	334
Liabilities:
Total liabilities	0	0
Level 1 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Municipal bonds
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	0	0
Level 1 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	21,115
Investment securities AFS	0	0
Level 1 | Recurring | Agency debentures
Assets:
Investment securities AFS	0
Level 1 | Recurring | Futures
Assets:
Derivatives	46	334
Level 1 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Options
Assets:
Derivatives	385
Level 1 | Recurring | Interest rate lock commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 2 | Recurring
Assets:
Single family LHFS	13,308	128,041
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	1,315,517	1,133,185
Liabilities:
Total liabilities	15,193	5,181
Level 2 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	197,027	30,556
Level 2 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	58,872	62,792
Level 2 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	453,214	187,394
Level 2 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	90,861	136,659
Level 2 | Recurring | Municipal bonds
Assets:
Investment securities AFS	428,197	539,923
Level 2 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	33,692	19,541
Level 2 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0
Investment securities AFS	19,827	23,175
Level 2 | Recurring | Agency debentures
Assets:
Investment securities AFS	4,004
Level 2 | Recurring | Futures
Assets:
Derivatives	0	0
Level 2 | Recurring | Forward sale commitments
Assets:
Derivatives	2,756	723
Liabilities:
Derivative liabilities	1,434	640
Level 2 | Recurring | Options
Assets:
Derivatives	0
Level 2 | Recurring | Interest rate lock commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 2 | Recurring | Interest rate swaps
Assets:
Derivatives	13,759	4,381
Liabilities:
Derivative liabilities	13,759	4,541
Level 3 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	5,850	7,287
Single family mortgage servicing rights	77,811	61,584
Total assets	85,742	73,840
Liabilities:
Total liabilities	408	3
Level 3 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	1,963	2,407
Level 3 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Municipal bonds
Assets:
Investment securities AFS	0	0
Level 3 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	70	75
Level 3 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0
Investment securities AFS	0	0
Level 3 | Recurring | Agency debentures
Assets:
Investment securities AFS	0
Level 3 | Recurring | Futures
Assets:
Derivatives	0	0
Level 3 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 3 | Recurring | Options
Assets:
Derivatives	0
Level 3 | Recurring | Interest rate lock commitments
Assets:
Derivatives	48	2,487
Liabilities:
Derivative liabilities	408	3
Level 3 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

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