Securities Available for Sale - Gross unrealized losses and the related fair value of securities available for sale (Details) $ in Thousands	Jun. 30, 2020 USD ($) Security	Dec. 31, 2019 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 2,211	$ 73,112
Less than 12 months, unrealized losses	3	379
12 months or more, fair value	762	65,967
12 months or more, unrealized losses	9	535
Total, fair value	2,973	139,079
Total, unrealized losses	$ 12	$ 914
Total, number of securities | Security	25	212
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value		$ 1,035
Less than 12 months, unrealized losses		2
12 months or more, fair value		11,091
12 months or more, unrealized losses		58
Total, fair value		12,126
Total, unrealized losses		$ 60
Total, number of securities | Security		6
State, county and municipals
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 882	$ 22,451
Less than 12 months, unrealized losses	2	132
12 months or more, fair value	0	7,605
12 months or more, unrealized losses	0	25
Total, fair value	882	30,056
Total, unrealized losses	$ 2	$ 157
Total, number of securities | Security	2	56
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 1,329	$ 49,626
Less than 12 months, unrealized losses	1	245
12 months or more, fair value	762	47,271
12 months or more, unrealized losses	9	452
Total, fair value	2,091	96,897
Total, unrealized losses	$ 10	$ 697
Total, number of securities | Security	23	150