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LOANS AND CREDIT QUALITY - Loans Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans held for investment
Total LHFI	$ 7,422,904	$ 7,426,320
ACL	(40,500)	(41,500)	$ (47,123)	$ (64,294)
Total LHFI less ACL	7,382,404	7,384,820
Fair Value, Recurring
Loans held for investment
Single family LHFI	1,280	5,868
Commercial and industrial loans
Loans held for investment
Total LHFI	5,898,324	6,064,612
Commercial and industrial loans | Real Estate Sector
Loans held for investment
Total LHFI	5,147,990	5,261,502
ACL	(27,912)	(27,859)	(21,486)	(27,935)
Commercial and industrial loans | Commercial and Industrial Sector
Loans held for investment
Total LHFI	750,334	803,110
ACL	(3,849)	(4,277)	(17,279)	(22,037)
Commercial and industrial loans | Non-owner occupied CRE
Loans held for investment
Total LHFI	641,885	658,085
ACL	(2,610)	(2,102)	(7,509)	(8,845)
Commercial and industrial loans | Multifamily
Loans held for investment
Total LHFI	3,940,189	3,975,754
ACL	(13,093)	(10,974)	(5,854)	(6,072)
Commercial and industrial loans | Construction/land development
Loans held for investment
Total LHFI	565,916	627,663
Commercial and industrial loans | Owner occupied CRE
Loans held for investment
Total LHFI	391,285	443,363
ACL	(899)	(1,030)	(5,006)	(4,994)
Commercial and industrial loans | Commercial business
Loans held for investment
Total LHFI	359,049	359,747
ACL	(2,950)	(3,247)	(12,273)	(17,043)
Consumer loans
Loans held for investment
Total LHFI	1,524,580	1,361,708
ACL	(8,739)	(9,364)	(8,358)	(14,322)
Consumer loans | Single family
Loans held for investment
Total LHFI	1,140,279	1,009,001
ACL	(5,287)	(5,610)	(4,394)	(6,906)
Consumer loans | Home equity and other
Loans held for investment
Total LHFI	384,301	352,707
ACL	$ (3,452)	$ (3,754)	$ (3,964)	$ (7,416)

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