SUMMARY OF ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 92,760	$ 98,200		$ 41,461	$ 42,492	$ 36,463	$ 28,441
Retained earnings	$ 613,791			600,641
Acquisition, Development, And Construction Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Value ratio	50.00%
Small Business Administration ("SBA") Paycheck Protection Program ("PPP") [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Value ratio	100.00%
Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				$ (3,919)
Maximum | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Value ratio	75.00%
Maximum | Multifamily Residential and Residential Mixed-Use [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Value ratio	75.00%
Maximum | Commercial Real Estate and Commercial Mixed-Use [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Value ratio	75.00%
Minimum | One- to-Four Family Residential, Including Condominium and Cooperative Apartment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt service ratio	1.25%
Minimum | Multifamily Residential and Residential Mixed-Use [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt service ratio	1.20%
Minimum | Commercial Real Estate and Commercial Mixed-Use [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt service ratio	1.25%
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ (3,900)
Reserve for unfunded commitments	$ 1,400
Retained earnings			$ 1,700