Investment securities available for sale - Summary of investment securities available for sale having fair value and unrealized loss position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	$ 13,335	$ 8,776
Securities in a loss position for less than 12 Months, Unrealized Losses	(544)	(611)
Securities in a loss position for more than 12 Months, Fair Value	40,289	58,193
Securities in a loss Position for more than 12 Months, Unrealized Losses	(7,828)	(7,155)
Total Fair Value	53,624	66,969
Total Unrealized Losses	(8,372)	(7,766)
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	322
Securities in a loss position for less than 12 Months, Unrealized Losses	(1)
Securities in a loss position for more than 12 Months, Fair Value	356	20,289
Securities in a loss Position for more than 12 Months, Unrealized Losses	(16)	(75)
Total Fair Value	678	20,289
Total Unrealized Losses	(17)	(75)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	10,224	4,631
Securities in a loss position for less than 12 Months, Unrealized Losses	(100)	(24)
Securities in a loss position for more than 12 Months, Fair Value	31,221	30,311
Securities in a loss Position for more than 12 Months, Unrealized Losses	(5,960)	(5,357)
Total Fair Value	41,445	34,942
Total Unrealized Losses	(6,060)	(5,381)
Municipals
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for more than 12 Months, Fair Value	1,652	1,656
Securities in a loss Position for more than 12 Months, Unrealized Losses	(611)	(608)
Total Fair Value	1,652	1,656
Total Unrealized Losses	(611)	(608)
Subordinated debt
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	2,789	4,145
Securities in a loss position for less than 12 Months, Unrealized Losses	(443)	(587)
Securities in a loss position for more than 12 Months, Fair Value	7,060	5,937
Securities in a loss Position for more than 12 Months, Unrealized Losses	(1,241)	(1,115)
Total Fair Value	9,849	10,082
Total Unrealized Losses	$ (1,684)	$ (1,702)