LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 6,759,737	$ 5,542,849
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,620,693	4,476,440
Commercial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	864,023	859,578
Commercial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	470,259	457,706
Commercial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	393,764	401,872
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,139,044	1,066,409
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	822,389	763,331
Consumer loans | Home equity and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	316,655	303,078
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,449	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	928	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	1,473	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	362	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