Loans and Allowance for Loan Losses, Risk Category of Loans (Details) - USD ($) $ in Thousands		Jun. 30, 2021		Dec. 31, 2020
Loans and Leases Receivable [Abstract]
Total loans, net		$ 4,349,367		$ 4,244,470
Impaired loans included in classified loans		444		796
New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	3,097,436		3,061,352
Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		1,251,931		1,183,118
Commercial [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		214,164		212,492
Commercial [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		195,163	[2]	193,707
Commercial [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		19,001		18,785
Commercial [Member] | Pass [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		210,905		208,474
Commercial [Member] | Pass [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		192,464	[2]	190,263
Commercial [Member] | Pass [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		18,441		18,211
Commercial [Member] | Classified [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		3,259		4,018
Commercial [Member] | Classified [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		2,699	[2]	3,444
Commercial [Member] | Classified [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		560		574
Commercial [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		164,823		167,441
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	146,430	[2]	148,775
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		18,393		18,666
Commercial [Member] | Commercial Real Estate [Member] | Pass [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		161,761		163,833
Commercial [Member] | Commercial Real Estate [Member] | Pass [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		143,928	[2]	145,741
Commercial [Member] | Commercial Real Estate [Member] | Pass [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		17,833		18,092
Commercial [Member] | Commercial Real Estate [Member] | Classified [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		3,062		3,608
Commercial [Member] | Commercial Real Estate [Member] | Classified [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		2,502	[2]	3,034
Commercial [Member] | Commercial Real Estate [Member] | Classified [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		560		574
Commercial [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		49,341		45,051
Commercial [Member] | Other [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net	[1]	48,733	[2]	44,932
Commercial [Member] | Other [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		608		119
Commercial [Member] | Other [Member] | Pass [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		49,144		44,641
Commercial [Member] | Other [Member] | Pass [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		48,536	[2]	44,522
Commercial [Member] | Other [Member] | Pass [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		608		119
Commercial [Member] | Other [Member] | Classified [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		197		410
Commercial [Member] | Other [Member] | Classified [Member] | New York and Other States [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		197	[2]	410
Commercial [Member] | Other [Member] | Classified [Member] | Florida [Member]
Loans and Leases Receivable [Abstract]
Total loans, net		$ 0		$ 0

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

[2] Includes New York, New Jersey and Massachusetts.