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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 7,156,206	$ 7,115,038
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	48,287	41,101
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	16,459	5,565
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	40,169	44,554
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	104,915	91,220
Current
Financing Receivable, Past Due [Line Items]
Loans receivable	7,051,291	7,023,818
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	2,000,408	1,845,960
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	1,266,438	1,259,651
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,654,152	1,689,943
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	62,898	68,137
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	264,684	243,553
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	2,000,408	1,845,960
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,430	4,002
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,442	481
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	16,631	13,833
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	22,503	18,316
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,977,905	1,827,644
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	1,266,438	1,259,651
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,047	311
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	831	0
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,760	910
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,638	1,221
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,261,800	1,258,430
Commercial | Loans and Finance Receivables, Traditional | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,654,152	1,689,943
Commercial | Loans and Finance Receivables, Traditional | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,124	0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,124	0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,653,028	1,689,943
Commercial | Loans and Finance Receivables, Traditional | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	62,898	68,137
Commercial | Loans and Finance Receivables, Traditional | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	735	287
Commercial | Loans and Finance Receivables, Traditional | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	247	0
Commercial | Loans and Finance Receivables, Traditional | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	9,193	10,299
Commercial | Loans and Finance Receivables, Traditional | SBA | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	10,175	10,586
Commercial | Loans and Finance Receivables, Traditional | SBA | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	52,723	57,551
Commercial | Loans and Finance Receivables, Traditional | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	264,684	243,553
Commercial | Loans and Finance Receivables, Traditional | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Loans and Finance Receivables, Traditional | Construction | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	264,684	243,553
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	1,820,721	1,920,806
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	86,905	86,988
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	1,820,721	1,920,806
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	43,956	36,338
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	9,466	5,068
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	12,504	19,431
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	65,926	60,837
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,754,795	1,859,969
Consumer | Loans and Finance Receivables, Traditional | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	86,905	86,988
Consumer | Loans and Finance Receivables, Traditional | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	119	163
Consumer | Loans and Finance Receivables, Traditional | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	349	16
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	81	81
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	549	260
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 86,356	$ 86,728

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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