LOANS AND CREDIT QUALITY - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 7,380,050	$ 7,422,904
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	5,827,703	5,898,324
Commercial and industrial loans | Commercial and Industrial Sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	749,163	750,334
Commercial and industrial loans | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	612,937	641,885
Commercial and industrial loans | Owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	372,452	391,285
Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	376,711	359,049
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,552,347	1,524,580
Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,152,004	1,140,279
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	32,061	34,243
Total | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	21,966	20,624
Total | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,230	16,803
Total | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Total | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,821	3,821
Total | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,095	12,846
Total | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	10,095	12,846
Total | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		773
Total | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		773
1-4 Family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,544	4,134
1-4 Family | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	573
1-4 Family | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	573
1-4 Family | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
1-4 Family | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
1-4 Family | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,544	2,788
1-4 Family | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	2,544	2,788
1-4 Family | Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		773
1-4 Family | Consumer loans | Single family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment		773
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Multifamily | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Multifamily | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Multifamily | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	1,915
Multifamily | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Multifamily | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Multifamily | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	24,471	25,522
Non-residential real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	20,051	20,051
Non-residential real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	16,230	16,230
Non-residential real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Non-residential real estate | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,821	3,821
Non-residential real estate | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,420	5,471
Non-residential real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	4,420	5,471
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	3,131	4,587
Other non-real estate | CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | CRE | Non-owner occupied CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | CRE | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0
Other non-real estate | CRE | CRE construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	0	0
Other non-real estate | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	3,131	4,587
Other non-real estate | Commercial and industrial loans | Commercial business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment	$ 3,131	4,587
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