Investment securities available for sale - Amortized cost and fair value of investment securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 90,866	$ 112,678
Gross Unrealized Gains	290	673
Gross Unrealized Losses	(8,372)	(7,766)
Fair Value	82,784	105,585
U.S. Government agencies obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	695	20,690
Gross Unrealized Losses	(17)	(75)
Fair Value	678	20,615
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	75,706	77,275
Gross Unrealized Gains	261	643
Gross Unrealized Losses	(6,060)	(5,381)
Fair Value	69,907	72,537
Municipals
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,263	2,264
Gross Unrealized Losses	(611)	(608)
Fair Value	1,652	1,656
Subordinated debt
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,202	12,449
Gross Unrealized Gains	29	30
Gross Unrealized Losses	(1,684)	(1,702)
Fair Value	$ 10,547	$ 10,777