Condensed Financial Information of Sterling Bancorp, Inc. (Parent Only) - CONDENSED BALANCE SHEETS (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Other assets	$ 11,476	$ 15,407
Total assets	2,444,735	2,876,830
Liabilities:
Subordinated notes, net	65,271	65,343
Total liabilities	2,132,108	2,533,203
Total shareholders' equity	312,627	343,627	$ 319,591	$ 332,614
Total liabilities and shareholders' equity	2,444,735	2,876,830
Parent company | Reportable legal entities
ASSETS
Cash held at Bank	20,064	26,905
Investment in subsidiaries	386,363	381,936
Other assets	1,160	1,777
Total assets	407,587	410,618
Liabilities:
Subordinated notes, net	65,271	65,343
Other liabilities	29,689	1,648
Total liabilities	94,960	66,991
Total shareholders' equity	312,627	343,627
Total liabilities and shareholders' equity	$ 407,587	$ 410,618