INVESTMENT AND MORTGAGE-BACKED SECURITIES - Securities Held-to-maturity Major Categories (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 179,309
Gross Unrecognized Gains	59
Gross Unrecognized Losses	(2,014)
Fair Value	177,354	$ 0
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	118,382
Gross Unrecognized Gains	59
Gross Unrecognized Losses	(1,141)
Fair Value	117,300
Agency collateralized mortgage obligations ("CMOs")
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	60,927
Gross Unrecognized Losses	(873)
Fair Value	$ 60,054

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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