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LOANS AND CREDIT QUALITY - Loans Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Loans held for investment
Loans held for investment	$ 7,213,487		$ 5,542,849
Allowance for credit losses	(37,606)	$ (37,355)	(47,123)	$ (54,516)	$ (59,897)	$ (64,294)
Loans held for investment less allowance for credit losses	7,175,881		5,495,726
Recurring
Loans held for investment
Single family LHFI	5,850		7,287
Recurring | Level 3
Loans held for investment
Single family LHFI	5,850		7,287
Commercial loans
Loans held for investment
Loans held for investment	5,974,181		4,476,440
Commercial loans | Real Estate Sector
Loans held for investment
Loans held for investment	5,180,432		3,616,862
Allowance for credit losses	(24,818)	(24,851)	(21,486)	(23,841)	(25,544)	(27,935)
Commercial loans | Commercial and Industrial Sector
Loans held for investment
Loans held for investment	793,749		859,578
Allowance for credit losses	(4,688)	(4,670)	(17,279)	(19,758)	(21,392)	(22,037)
Commercial loans | Non-owner occupied CRE
Loans held for investment
Loans held for investment	666,394		705,359
Allowance for credit losses	(2,106)	(2,180)	(7,509)	(9,636)	(9,077)	(8,845)
Commercial loans | Multifamily
Loans held for investment
Loans held for investment	3,923,946		2,415,359
Allowance for credit losses	(11,183)	(10,074)	(5,854)	(5,457)	(7,245)	(6,072)
Commercial loans | Construction/land development
Loans held for investment
Loans held for investment	590,092		496,144
Commercial loans | Owner occupied CRE
Loans held for investment
Loans held for investment	432,114		457,706
Allowance for credit losses	(969)	(1,092)	(5,006)	(5,285)	(5,518)	(4,994)
Commercial loans | Commercial business
Loans held for investment
Loans held for investment	361,635		401,872
Allowance for credit losses	(3,719)	(3,578)	(12,273)	(14,473)	(15,874)	(17,043)
Consumer loans
Loans held for investment
Loans held for investment	1,239,306		1,066,409
Allowance for credit losses	(8,100)	(7,834)	(8,358)	(10,917)	(12,961)	(14,322)
Consumer loans | Single family
Loans held for investment
Loans held for investment	907,044		763,331
Allowance for credit losses	(4,464)	(4,027)	(4,394)	(5,757)	(7,163)	(6,906)
Consumer loans | Home equity and other
Loans held for investment
Loans held for investment	332,262		303,078
Allowance for credit losses	$ (3,636)	$ (3,807)	$ (3,964)	$ (5,160)	$ (5,798)	$ (7,416)

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