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LOANS AND CREDIT QUALITY - Loans Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans held for investment
Loans held for investment	$ 7,380,050		$ 7,422,904
Allowance for credit losses	(39,741)	$ (39,677)	(40,500)	$ (41,500)	$ (41,500)	$ (41,500)
Loans held for investment less allowance for credit losses	7,340,309		7,382,404
Recurring
Loans held for investment
Single family LHFI	1,286		1,280
Recurring | Level 3
Loans held for investment
Single family LHFI	1,286		1,280
Single family
Loans held for investment
Allowance for credit losses	(3,844)			(6,617)
Home equity and other
Loans held for investment
Allowance for credit losses	(2,973)			(3,956)
Commercial and industrial loans
Loans held for investment
Loans held for investment	5,827,703		5,898,324
Commercial and industrial loans | Real Estate Sector
Loans held for investment
Loans held for investment	5,078,540		5,147,990
Allowance for credit losses	(26,598)	(28,900)	(27,912)	(26,160)	(27,680)	(27,859)
Commercial and industrial loans | Commercial and Industrial Sector
Loans held for investment
Loans held for investment	749,163		750,334
Allowance for credit losses	(6,326)	(3,482)	(3,849)	(4,767)	(4,326)	(4,277)
Commercial and industrial loans | Non-owner occupied CRE
Loans held for investment
Loans held for investment	612,937		641,885
Allowance for credit losses	(1,777)	(2,131)	(2,610)	(2,242)	(2,608)	(2,102)
Commercial and industrial loans | Multifamily
Loans held for investment
Loans held for investment	3,935,158		3,940,189
Allowance for credit losses	(17,070)	(18,947)	(13,093)	(9,695)	(9,787)	(10,974)
Commercial and industrial loans | Construction/land development
Loans held for investment
Loans held for investment	530,445		565,916
Commercial and industrial loans | Owner occupied CRE
Loans held for investment
Loans held for investment	372,452		391,285
Allowance for credit losses	(731)	(836)	(899)	(930)	(910)	(1,030)
Commercial and industrial loans | Commercial business
Loans held for investment
Loans held for investment	376,711		359,049
Allowance for credit losses	(5,595)	(2,646)	(2,950)	(3,837)	(3,416)	(3,247)
Consumer loans
Loans held for investment
Loans held for investment	1,552,347		1,524,580
Allowance for credit losses	(6,817)	(7,295)	(8,739)	(10,573)	(9,494)	(9,364)
Consumer loans | Single family
Loans held for investment
Loans held for investment	1,152,004		1,140,279
Allowance for credit losses	(3,844)	(4,273)	(5,287)	(6,617)	(5,804)	(5,610)
Consumer loans | Home equity and other
Loans held for investment
Loans held for investment	400,343		384,301
Allowance for credit losses	$ (2,973)	$ (3,022)	$ (3,452)	$ (3,956)	$ (3,690)	$ (3,754)

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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