Loans (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) contract	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($)
Total loans, net of fees and costs	$ 6,904,176		$ 6,934,769
Provision for credit losses	7,521	$ 1,233
Allowance for credit losses	$ 38,729	$ 37,433	$ 40,442	$ 37,135
Percentage of financing receivable on total loans	0.56%		0.58%
Percentage of financing receivable non-performing loans	182.90%		124.90%
Number of TDR loan modifications | contract		3
Performing Financial Instruments [Member]
Number of TDR loan modifications | contract			16
Loans Receivable [Member]
Interest Receivable	$ 35,100		$ 34,500
Commercial Real Estate [Member]
Total loans, net of fees and costs	1,905,707		1,914,898
Provision for credit losses	(513)	$ 558
Allowance for credit losses	7,671	7,716	$ 8,184	7,158
Commercial Real Estate [Member] | Performing Financial Instruments [Member]
Number of TDR loan modifications | contract			1
Small Business Administration Portfolio Segment [Member]
Total loans, net of fees and costs	22,760		$ 23,193
Provision for credit losses	(35)	1,643
Allowance for credit losses	2,169	$ 1,837	$ 2,198	1,209
Small Business Administration
Number of TDR loan modifications | contract		1
Small Business Administration | Performing Financial Instruments [Member]
Number of TDR loan modifications | contract			1
Multi-family Residential Portfolio Segment [Member]
Total loans, net of fees and costs	2,604,174		$ 2,605,172
Provision for credit losses	(512)	$ 376
Allowance for credit losses	9,041	8,561	9,552	8,185
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member]
Total loans, net of fees and costs	551,971		557,295
Provision for credit losses	(165)	109
Allowance for credit losses	1,710	1,864	1,875	1,755
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] | Performing Financial Instruments [Member]
Non-accrual loans			300
Commercial Business and Other Portfolio Segment [Member]
Total loans, net of fees and costs	1,519,606		1,520,907
Provision for credit losses	9,065	(1,503)
Allowance for credit losses	$ 17,259	$ 16,421	17,471	$ 17,858
Commercial Business and Other Portfolio Segment [Member] | Performing Financial Instruments [Member]
Non-accrual loans			$ 100