Securities - Additional disclosures (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fair value of pledged securities	$ 2,694	$ 2,694	$ 2,665
Impairment charges	0	0
Federal Reserve Bank of New York (FRB)
Debt Securities, Available-for-sale [Line Items]
Fair value of pledged securities	22,900	22,900	23,600
Securities pledged borrowed amount	22,400	22,400	22,900
Federal Home Loan Bank of New York (FHLB)
Debt Securities, Available-for-sale [Line Items]
Fair value of pledged securities	99,700	99,700	122,800
Securities pledged borrowed amount	$ 95,300	$ 95,300	$ 116,700