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LOANS AND CREDIT QUALITY - Loans Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans held for investment
Total LHFI	$ 7,426,320	$ 5,542,849
ACL	(41,500)	(47,123)	$ (64,294)	$ (41,772)
Total LHFI less ACL	7,384,820	5,495,726
Fair Value, Recurring
Loans held for investment
Single family LHFI	5,868	7,287
Commercial and industrial loans
Loans held for investment
Total LHFI	6,064,612	4,476,440
Commercial and industrial loans | Real Estate Sector
Loans held for investment
Total LHFI	5,261,502	3,616,862
ACL	(27,859)	(21,486)	(27,935)	(22,535)
Commercial and industrial loans | Commercial and Industrial Sector
Loans held for investment
Total LHFI	803,110	859,578
ACL	(4,277)	(17,279)	(22,037)	(6,554)
Commercial and industrial loans | Non-owner occupied CRE
Loans held for investment
Total LHFI	658,085	705,359
ACL	(2,102)	(7,509)	(8,845)	(7,245)
Commercial and industrial loans | Multifamily
Loans held for investment
Total LHFI	3,975,754	2,415,359
ACL	(10,974)	(5,854)	(6,072)	(7,015)
Commercial and industrial loans | Construction/land development
Loans held for investment
Total LHFI	627,663	496,144
Commercial and industrial loans | Owner occupied CRE
Loans held for investment
Total LHFI	443,363	457,706
ACL	(1,030)	(5,006)	(4,994)	(3,639)
Commercial and industrial loans | Commercial business
Loans held for investment
Total LHFI	359,747	401,872
ACL	(3,247)	(12,273)	(17,043)	(2,915)
Consumer loans
Loans held for investment
Total LHFI	1,361,708	1,066,409
ACL	(9,364)	(8,358)	(14,322)	(12,683)
Consumer loans | Single family
Loans held for investment
Total LHFI	1,009,001	763,331
ACL	(5,610)	(4,394)	(6,906)	(6,450)
Consumer loans | Home equity and other
Loans held for investment
Total LHFI	352,707	303,078
ACL	$ (3,754)	$ (3,964)	$ (7,416)	$ (6,233)

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