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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 7,486,382	$ 7,426,320
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	6,066,481	6,064,612
Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	830,984	803,110
Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	438,147	443,363
Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	392,837	359,747
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,419,901	1,361,708
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,057,579	1,009,001
Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	362,322	352,707
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	9,033
Total | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	8,186	6,331
Total | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,668	2,521
Total | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,518	3,810
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	847
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	847
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	973
Land | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	973	1,173
Land | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	972	1,111
Land | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1	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	4,025
1-4 Family | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,178	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	3,178	3,186
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	847
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	847
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,258
Non-residential real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,258	1,972
Non-residential real estate | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,696	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	777
Other non-real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	777	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	777	$ 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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
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-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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