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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 7,436,651	$ 7,426,320
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	6,000,215	6,064,612
Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	806,179	803,110
Commercial loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	650,710	658,085
Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	434,400	443,363
Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	371,779	359,747
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,436,436	1,361,708
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,068,229	1,009,001
Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	368,207	352,707
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	35,760
Total | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	20,760
Total | Commercial real estate loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,800
Total | Commercial real estate loans | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,960
Total | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	14,158	6,331
Total | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,157	2,521
Total | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	12,001	3,810
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	842
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	842
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,115
Land | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,960
Land | Commercial real estate loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Land | Commercial real estate loans | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,960
Land | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	6,155	1,173
Land | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	1,111
Land | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	6,155	62
Land | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Land | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,915
1-4 Family | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | Commercial real estate loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | Commercial real estate loans | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,073	3,186
1-4 Family | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
1-4 Family | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,073	3,186
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	842
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	842
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	19,519
Non-residential real estate | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,800
Non-residential real estate | Commercial real estate loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,800
Non-residential real estate | Commercial real estate loans | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,719	1,972
Non-residential real estate | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,157	1,410
Non-residential real estate | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	562	562
Non-residential real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,211
Other non-real estate | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | Commercial real estate loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | Commercial real estate loans | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,211	0
Other non-real estate | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,211	$ 0
Other non-real estate | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 0

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
-Paragraph 5
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-Publisher FASB
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