LOANS RECEIVABLE, NET - Schedule of Quality of Bank's Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 4,423,780	$ 4,411,319
Non- Accrual	33,019	33,183
90 Days or More Delinquent and Still Accruing Interest	0	0
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	12,638	27,751
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	7,932	5,320
Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	53,589	66,254
Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,370,191	4,345,065
Commercial portfolio
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,566,415	2,536,176
Non- Accrual	24,228	23,189
90 Days or More Delinquent and Still Accruing Interest	0	0
Commercial portfolio | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	113	17,433
Commercial portfolio | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	19	168
Commercial portfolio | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	24,360	40,790
Commercial portfolio | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,542,055	2,495,386
Commercial portfolio | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,014,084	1,010,998
Non- Accrual	8,750	7,533
90 Days or More Delinquent and Still Accruing Interest	0	0
Commercial portfolio | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	113	266
Commercial portfolio | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	19	168
Commercial portfolio | Commercial and industrial | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	8,882	7,967
Commercial portfolio | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,005,202	1,003,031
Commercial portfolio | Multifamily
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,175,467	1,148,120
Non- Accrual	0	0
90 Days or More Delinquent and Still Accruing Interest	0	0
Commercial portfolio | Multifamily | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	11,968
Commercial portfolio | Multifamily | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Commercial portfolio | Multifamily | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	11,968
Commercial portfolio | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,175,467	1,136,152
Commercial portfolio | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	353,598	353,432
Non- Accrual	4,354	4,490
90 Days or More Delinquent and Still Accruing Interest	0	0
Commercial portfolio | Commercial real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Commercial portfolio | Commercial real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Commercial portfolio | Commercial real estate | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,354	4,490
Commercial portfolio | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	349,244	348,942
Commercial portfolio | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	23,266	23,626
Non- Accrual	11,124	11,166
90 Days or More Delinquent and Still Accruing Interest	0	0
Commercial portfolio | Construction and land development | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	5,199
Commercial portfolio | Construction and land development | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Commercial portfolio | Construction and land development | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	11,124	16,365
Commercial portfolio | Construction and land development | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	12,142	7,261
Retail portfolio
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,857,365	1,875,143
Non- Accrual	8,791	9,994
90 Days or More Delinquent and Still Accruing Interest	0	0
Retail portfolio | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	12,525	10,318
Retail portfolio | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	7,913	5,152
Retail portfolio | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	29,229	25,464
Retail portfolio | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,828,136	1,849,679
Retail portfolio | Residential real estate lending
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,419,321	1,425,596
Non- Accrual	4,763	7,218
90 Days or More Delinquent and Still Accruing Interest	0	0
Retail portfolio | Residential real estate lending | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	9,406	6,995
Retail portfolio | Residential real estate lending | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,458	2,133
Retail portfolio | Residential real estate lending | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	19,627	16,346
Retail portfolio | Residential real estate lending | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,399,694	1,409,250
Retail portfolio | Consumer solar
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	398,501	408,260
Non- Accrual	3,852	2,673
90 Days or More Delinquent and Still Accruing Interest	0	0
Retail portfolio | Consumer solar | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,585	2,569
Retail portfolio | Consumer solar | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,579	2,788
Retail portfolio | Consumer solar | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	8,016	8,030
Retail portfolio | Consumer solar | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	390,485	400,230
Retail portfolio | Consumer and Other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	39,543	41,287
Non- Accrual	176	103
90 Days or More Delinquent and Still Accruing Interest	0	0
Retail portfolio | Consumer and Other | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	534	754
Retail portfolio | Consumer and Other | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	876	231
Retail portfolio | Consumer and Other | Total Past Due and Non-Accrual
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,586	1,088
Retail portfolio | Consumer and Other | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 37,957	$ 40,199