Investment securities available for sale - Summary of investment securities available for sale having fair value and unrealized loss position (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	$ 64,655	$ 7,222
Securities in a loss position for less than 12 Months, Unrealized Losses	(1,126)	(62)
Securities in a loss position for more than 12 Months, Fair Value	4,988	2,807
Securities in a loss Position for more than 12 Months, Unrealized Losses	(195)	(125)
Total Fair Value	69,643	10,029
Total Unrealized Losses	(1,321)	(187)
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	39,617
Securities in a loss position for less than 12 Months, Unrealized Losses	(536)
Securities in a loss position for more than 12 Months, Fair Value	0
Securities in a loss Position for more than 12 Months, Unrealized Losses	0
Total Fair Value	39,617
Total Unrealized Losses	(536)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	21,911	5,475
Securities in a loss position for less than 12 Months, Unrealized Losses	(448)	(51)
Securities in a loss position for more than 12 Months, Fair Value	4,518	0
Securities in a loss Position for more than 12 Months, Unrealized Losses	(165)	0
Total Fair Value	26,429	5,475
Total Unrealized Losses	(613)	(51)
Municipals
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	2,208
Securities in a loss position for less than 12 Months, Unrealized Losses	(62)
Securities in a loss position for more than 12 Months, Fair Value	0
Securities in a loss Position for more than 12 Months, Unrealized Losses	0
Total Fair Value	2,208
Total Unrealized Losses	(62)
Fixed-to-floating rate subordinated notes
Schedule of Available-for-sale Securities [Line Items]
Securities in a loss position for less than 12 Months, Fair Value	919	1,747
Securities in a loss position for less than 12 Months, Unrealized Losses	(80)	(11)
Securities in a loss position for more than 12 Months, Fair Value	470	2,807
Securities in a loss Position for more than 12 Months, Unrealized Losses	(30)	(125)
Total Fair Value	1,389	4,554
Total Unrealized Losses	$ (110)	$ (136)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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