Investment securities available for sale - Summary of investment securities available for sale having fair value and unrealized loss position (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	$ 71,859,000	$ 64,655,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(6,443,000)	(1,126,000)
Securities in a loss position for more than 12 Months, Fair Value	57,528,000	4,988,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(8,223,000)	(195,000)
Total Fair Value	129,387,000	69,643,000
Total Unrealized Losses	(14,666,000)	(1,321,000)
U.S. Government agencies obligations
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	23,602,000	39,617,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(768,000)	(536,000)
Securities in a loss position for more than 12 Months, Fair Value	36,975,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(3,298,000)
Total Fair Value	60,577,000	39,617,000
Total Unrealized Losses	(4,066,000)	(536,000)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	42,320,000	21,911,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(5,060,000)	(448,000)
Securities in a loss position for more than 12 Months, Fair Value	17,620,000	4,518,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(4,090,000)	(165,000)
Total Fair Value	59,940,000	26,429,000
Total Unrealized Losses	(9,150,000)	(613,000)
Municipals
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value		2,208,000
Securities in a loss position for less than 12 Months, Unrealized Losses		(62,000)
Securities in a loss position for more than 12 Months, Fair Value	1,545,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(723,000)
Total Fair Value	1,545,000	2,208,000
Total Unrealized Losses	(723,000)	(62,000)
Subordinated debt
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	5,937,000	919,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(615,000)	(80,000)
Securities in a loss position for more than 12 Months, Fair Value	1,388,000	470,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(112,000)	(30,000)
Total Fair Value	7,325,000	1,389,000
Total Unrealized Losses	$ (727,000)	$ (110,000)