Loan Portfolio and Allowance for Credit Losses, Recorded Investment in Loans by Loan Class (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable [Abstract]
Total loans, net		$ 5,005,506	$ 5,002,879
Less: Allowance for credit losses		49,220	48,578	$ 46,685	$ 46,032
Net loans		4,956,286	4,954,301
New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	3,251,530	3,259,038
Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		1,753,976	1,743,841
Real Estate Construction Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		25,800	29,100
Residential Borrowers [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		7,600	8,000
Commercial Borrowers Residential Purpose [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		18,200	21,100
Commercial [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		279,092	273,515
Less: Allowance for credit losses		2,742	2,735	2,708	2,596
Commercial [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		254,915	252,255
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	214,158	212,754
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		40,757	39,501
Commercial [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		24,177	21,260
Commercial [Member] | Other [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	23,536	20,863
Commercial [Member] | Other [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		641	397
Commercial [Member] | PPP Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		556	620
Real Estate Mortgage - 1 to 4 Family [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		4,710,248	4,712,478
Less: Allowance for credit losses		46,295	45,625	43,766	43,271
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		4,296,551	4,307,105
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	2,744,294	2,756,914
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		1,552,257	1,550,191
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		57,818	57,958
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	44,207	44,152
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		13,611	13,806
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		355,879	347,415
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	213,754	212,298
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		142,125	135,117
Installment [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		16,166	16,886
Less: Allowance for credit losses		183	218	$ 211	$ 165
Installment [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	11,581	12,057
Installment [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		$ 4,585	$ 4,829

[1] Includes New York, New Jersey, Vermont and Massachusetts.