Investment securities available for sale - Summary of investment securities available for sale having fair value and unrealized loss position (Details) - USD ($)	Jun. 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	$ 111,407,000	$ 64,655,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(7,426,000)	(1,126,000)
Securities in a loss position for more than 12 Months, Fair Value	15,302,000	4,988,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(2,598,000)	(195,000)
Total Fair Value	126,709,000	69,643,000
Total Unrealized Losses	(10,024,000)	(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	57,987,000	39,617,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(2,914,000)	(536,000)
Total Fair Value	57,987,000	39,617,000
Total Unrealized Losses	(2,914,000)	(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	46,226,000	21,911,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(3,912,000)	(448,000)
Securities in a loss position for more than 12 Months, Fair Value	13,412,000	4,518,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(2,210,000)	(165,000)
Total Fair Value	59,638,000	26,429,000
Total Unrealized Losses	(6,122,000)	(613,000)
Municipals
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	778,000	2,208,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(213,000)	(62,000)
Securities in a loss position for more than 12 Months, Fair Value	926,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(352,000)
Total Fair Value	1,704,000	2,208,000
Total Unrealized Losses	(565,000)	(62,000)
Subordinated debt
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	6,416,000	919,000
Securities in a loss position for less than 12 Months, Unrealized Losses	(387,000)	(80,000)
Securities in a loss position for more than 12 Months, Fair Value	964,000	470,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	(36,000)	(30,000)
Total Fair Value	7,380,000	1,389,000
Total Unrealized Losses	$ (423,000)	$ (110,000)