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LOANS AND CREDIT QUALITY - Loans Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans held for investment
Total LHFI	$ 5,542,849	$ 5,244,180
ACL	(47,123)	(64,294)	$ (41,772)	$ (41,470)
Total LHFI less ACL	5,495,726	5,179,886
Fair Value, Recurring
Loans held for investment
Fair value of loans held for investment	7,287	7,108
Fair Value, Recurring | Level 3
Loans held for investment
Fair value of loans held for investment	7,287	7,108
Commercial loans
Loans held for investment
Total LHFI	4,476,440	3,924,304
Commercial loans | Real Estate Sector
Loans held for investment
Total LHFI	3,616,862	2,811,325
ACL	(21,486)	(27,935)	(22,535)	(20,250)
Commercial loans | Commercial and Industrial Sector
Loans held for investment
Total LHFI	859,578	1,112,979
ACL	(17,279)	(22,037)	(6,554)	(6,153)
Commercial loans | Non-owner occupied CRE
Loans held for investment
Total LHFI	705,359	829,538
ACL	(7,509)	(8,845)	(7,245)	(5,495)
Commercial loans | Multifamily
Loans held for investment
Total LHFI	2,415,359	1,428,092
ACL	(5,854)	(6,072)	(7,015)	(5,754)
Commercial loans | Construction/land development
Loans held for investment
Total LHFI	496,144	553,695
ACL			(8,275)	(9,001)
Commercial loans | Owner occupied CRE
Loans held for investment
Total LHFI	457,706	467,256
ACL	(5,006)	(4,994)	(3,639)	(3,278)
Commercial loans | Commercial business
Loans held for investment
Total LHFI	401,872	645,723
ACL	(12,273)	(17,043)	(2,915)	(2,875)
Consumer loans-single family
Loans held for investment
Total LHFI	1,066,409	1,319,876
ACL	(8,358)	(14,322)	(12,683)	(15,067)
Consumer loans-single family | Single family
Loans held for investment
Total LHFI	763,331	915,123
ACL	(4,394)	(6,906)	(6,450)	(8,217)
Consumer loans-single family | Home equity and other
Loans held for investment
Total LHFI	303,078	404,753
ACL	$ (3,964)	$ (7,416)	$ (6,233)	$ (6,850)

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