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Loans and Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Provision (benefit) for credit losses	$ 2,811	$ 7,117
Allowance for credit losses	$ 45,099	28,098	$ 45,153	$ 21,751
Percentage of financing receivable on total loans	0.67%
Percentage of financing receivable on gross loans	212.90%
Loans Receivable [Member]
Interest Receivable	$ 41,900
Commercial Real Estate
Provision (benefit) for credit losses	93	1,192
Allowance for credit losses	8,356	6,791	8,327	4,429
Multi-family Residential Portfolio Segment [Member]
Provision (benefit) for credit losses	620	1,148
Allowance for credit losses	7,144	5,895	6,557	5,391
Taxi Medallion Portfolio Segment [Member]
Provision (benefit) for credit losses	2,758
Taxi Medallion Portfolio Segment [Member] | Performing Financial Instruments [Member]
Non-accrual loans			400
Commercial Business and Other Portfolio Segment [Member]
Provision (benefit) for credit losses	(521)	4,155
Allowance for credit losses	24,139	$ 10,637	24,666	$ 8,554
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member]
Non-accrual loans	$ 2,200		$ 2,200

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- Definition

The percentage of allowance for credit loss on total non performing loans.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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