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LOANS AND CREDIT QUALITY - Loans Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loans held for investment
Loans held for investment	$ 7,440,501		$ 7,426,320
Allowance for credit losses	(40,000)	$ (41,500)	(41,500)	$ (37,606)	$ (37,355)	$ (47,123)
Loans held for investment less allowance for credit losses	7,400,501		7,384,820
Recurring
Loans held for investment
Single family LHFI	1,225		5,868
Recurring | Level 3
Loans held for investment
Single family LHFI	1,225		5,868
Commercial loans
Loans held for investment
Loans held for investment	5,969,982		6,064,612
Commercial loans | Real Estate Sector
Loans held for investment
Loans held for investment	5,156,581		5,261,502
Allowance for credit losses	(25,552)	(26,160)	(27,859)	(24,818)	(24,851)	(21,486)
Commercial loans | Commercial and Industrial Sector
Loans held for investment
Loans held for investment	813,401		803,110
Allowance for credit losses	(4,703)	(4,767)	(4,277)	(4,688)	(4,670)	(17,279)
Commercial loans | Non-owner occupied CRE
Loans held for investment
Loans held for investment	633,083		658,085
Allowance for credit losses	(2,365)	(2,242)	(2,102)	(2,106)	(2,180)	(7,509)
Commercial loans | Multifamily
Loans held for investment
Loans held for investment	3,957,209		3,975,754
Allowance for credit losses	(10,706)	(9,695)	(10,974)	(11,183)	(10,074)	(5,854)
Commercial loans | Construction/land development
Loans held for investment
Loans held for investment	566,289		627,663
Commercial loans | Owner occupied CRE
Loans held for investment
Loans held for investment	428,253		443,363
Allowance for credit losses	(1,102)	(930)	(1,030)	(969)	(1,092)	(5,006)
Commercial loans | Commercial business
Loans held for investment
Loans held for investment	385,148		359,747
Allowance for credit losses	(3,601)	(3,837)	(3,247)	(3,719)	(3,578)	(12,273)
Consumer loans
Loans held for investment
Loans held for investment	1,470,519		1,361,708
Allowance for credit losses	(9,745)	(10,573)	(9,364)	(8,100)	(7,834)	(8,358)
Consumer loans | Single family
Loans held for investment
Loans held for investment	1,099,644		1,009,001
Allowance for credit losses	(5,783)	(6,617)	(5,610)	(4,464)	(4,027)	(4,394)
Consumer loans | Home equity and other
Loans held for investment
Loans held for investment	370,875		352,707
Allowance for credit losses	$ (3,962)	$ (3,956)	$ (3,754)	$ (3,636)	$ (3,807)	$ (3,964)

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