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2. Investment securities (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value $ 120,742 $ 87,953
Less than 12 months, unrealized losses 2,368 652
12 months or more, fair value 6,077 8,955
12 months or more, unrealized losses 222 236
Total, fair value 126,819 96,908
Total, unrealized losses 2,590 888
U.S. Government Sponsored Enterprises    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value 0 0
Less than 12 months, unrealized losses 0 0
12 months or more, fair value 4,098 4,193
12 months or more, unrealized losses 202 208
Total, fair value 4,098 4,193
Total, unrealized losses 202 208
Mortgage-Backed Securities    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value 82,322 80,827
Less than 12 months, unrealized losses 947 565
12 months or more, fair value 1,979 4,762
12 months or more, unrealized losses 20 28
Total, fair value 84,301 85,589
Total, unrealized losses 967 593
State and Political Subdivisions    
Investment Securities With Continuous Unrealized Loss Position    
Less than 12 months, fair value 38,420 7,126
Less than 12 months, unrealized losses 1,421 87
12 months or more, fair value 0 0
12 months or more, unrealized losses 0 0
Total, fair value 38,420 7,126
Total, unrealized losses $ 1,421 $ 87