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LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 7,213,487	$ 5,542,849
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,974,181	4,476,440
Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	793,749	859,578
Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	432,114	457,706
Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	361,635	401,872
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,239,306	1,066,409
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	907,044	763,331
Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	332,262	303,078
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,149	6,421
Total | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		4,804
Total | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,521	3,567
Total | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	628	1,237
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,617
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,598
Total | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		19
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,173	1,473
Land | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,473
Land | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,111	1,111
Land | Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	62	362
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
Land | Consumer loans | Home equity and other
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	0	1,644
1-4 Family | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		27
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	0	27
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,617
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		1,598
1-4 Family | Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		19
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,972	3,018
Non-residential real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		3,018
Non-residential real estate | Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,410	2,456
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
Non-residential real estate | Consumer loans | Home equity and other
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	4	286
Other non-real estate | Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		286
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	$ 4	286
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
Other non-real estate | Consumer loans | Home equity and other
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
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-Publisher FASB
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