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FAIR VALUE MEASUREMENT - Schedule of Fair Value Hierarchy Measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets:
Investment securities AFS	$ 1,201,757	$ 1,002,522
Single family mortgage servicing rights	76,481
Derivatives	1,170	9,280
Liabilities:
Derivative liabilities	10,764	1,263
Residential mortgage-backed securities
Assets:
Investment securities AFS	128,931	32,963
Commercial mortgage-backed securities
Assets:
Investment securities AFS	63,573	62,792
Municipal bonds
Assets:
Investment securities AFS	535,353	539,923
Corporate debt securities
Assets:
Investment securities AFS	30,330	19,616
U.S. Treasury securities
Assets:
Investment securities AFS	20,930	23,175
Recurring
Assets:
Single family LHFS	35,853	128,041
Single family LHFI	6,508	7,287
Single family mortgage servicing rights	76,481	61,584
Total assets	1,364,885	1,207,359
Liabilities:
Total liabilities	10,671	5,184
Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	128,931	32,963
Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	63,573	62,792
Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	296,049	187,394
Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	126,591	136,659
Recurring | Municipal bonds
Assets:
Investment securities AFS	535,353	539,923
Recurring | Corporate debt securities
Assets:
Investment securities AFS	30,330	19,616
Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	33,081
Investment securities AFS	20,930	23,175
Recurring | Futures
Assets:
Derivatives		334
Liabilities:
Derivative liabilities	143
Recurring | Forward sale commitments
Assets:
Derivatives	1,058	723
Liabilities:
Derivative liabilities	902	640
Recurring | Options
Assets:
Derivatives	199
Recurring | Interest rate lock commitments
Assets:
Derivatives	737	2,487
Liabilities:
Derivative liabilities	415	3
Recurring | Interest rate swaps
Assets:
Derivatives	9,211	4,381
Liabilities:
Derivative liabilities	9,211	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	33,280	334
Liabilities:
Total liabilities	143	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	33,081
Investment securities AFS	0	0
Level 1 | Recurring | Futures
Assets:
Derivatives		334
Liabilities:
Derivative liabilities	143
Level 1 | Recurring | Forward sale commitments
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	0	0
Level 1 | Recurring | Options
Assets:
Derivatives	199
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	35,853	128,041
Single family LHFI	0	0
Single family mortgage servicing rights	0	0
Total assets	1,245,719	1,133,185
Liabilities:
Total liabilities	10,113	5,181
Level 2 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	126,843	30,556
Level 2 | Recurring | Commercial mortgage-backed securities
Assets:
Investment securities AFS	63,573	62,792
Level 2 | Recurring | Collateralized mortgage obligations residential
Assets:
Investment securities AFS	296,049	187,394
Level 2 | Recurring | Collateralized mortgage obligations commercial
Assets:
Investment securities AFS	126,591	136,659
Level 2 | Recurring | Municipal bonds
Assets:
Investment securities AFS	535,353	539,923
Level 2 | Recurring | Corporate debt securities
Assets:
Investment securities AFS	30,258	19,541
Level 2 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0
Investment securities AFS	20,930	23,175
Level 2 | Recurring | Futures
Assets:
Derivatives		0
Liabilities:
Derivative liabilities	0
Level 2 | Recurring | Forward sale commitments
Assets:
Derivatives	1,058	723
Liabilities:
Derivative liabilities	902	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	9,211	4,381
Liabilities:
Derivative liabilities	9,211	4,541
Level 3 | Recurring
Assets:
Single family LHFS	0	0
Single family LHFI	6,508	7,287
Single family mortgage servicing rights	76,481	61,584
Total assets	85,886	73,840
Liabilities:
Total liabilities	415	3
Level 3 | Recurring | Residential mortgage-backed securities
Assets:
Investment securities AFS	2,088	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	72	75
Level 3 | Recurring | U.S. Treasury securities
Assets:
Trading securities - U.S. Treasury securities	0
Investment securities AFS	0	0
Level 3 | Recurring | Futures
Assets:
Derivatives		0
Liabilities:
Derivative liabilities	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	737	2,487
Liabilities:
Derivative liabilities	415	3
Level 3 | Recurring | Interest rate swaps
Assets:
Derivatives	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

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