Loan Portfolio and Allowance for Credit Losses, Recorded Investment in Loans by Loan Class (Details) - USD ($) $ in Thousands		Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable [Abstract]
Total loans, net		$ 5,038,312		$ 5,002,879
Less: Allowance for credit losses		49,772	$ 49,220	48,578	$ 46,914	$ 46,685	$ 46,032
Net loans		4,988,540		4,954,301
New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	3,262,911		3,259,038
Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		1,775,401		1,743,841
Real Estate Construction Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		24,900		29,100
Residential Borrowers [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		8,000		8,000
Commercial Borrowers Residential Purpose [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		16,900		21,100
Commercial [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		282,441		273,515
Less: Allowance for credit losses		3,429	2,742	2,735	2,610	2,708	2,596
Commercial [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		255,027		252,255
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	215,840		212,754
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		39,187		39,501
Commercial [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		27,414		21,260
Commercial [Member] | Other [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	26,748		20,863
Commercial [Member] | Other [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		666		397
Commercial [Member] | PPP Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		341		620
Real Estate Mortgage - 1 to 4 Family [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		4,740,703		4,712,478
Less: Allowance for credit losses		46,129	46,295	45,625	44,067	43,766	43,271
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		4,312,611		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]	2,743,992		2,756,914
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		1,568,619		1,550,191
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		58,029		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]	44,420		44,152
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		13,609		13,806
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		370,063		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]	221,067		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		148,996		135,117
Installment [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		15,168		16,886
Less: Allowance for credit losses		214	$ 183	218	$ 237	$ 211	$ 165
Installment [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	10,844		12,057
Installment [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		$ 4,324		$ 4,829

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