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2. Investment Securities (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value $ 87,953 $ 38,661
Less than 12 months, unrealized losses 652 387
12 months or more, fair value 8,955 12,502
12 months or more, unrealized losses 236 351
Total, fair value 96,908 51,163
Total, unrealized losses 888 738
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 80,827 28,395
Less than 12 months, unrealized losses 565 177
12 months or more, fair value 4,762 6,351
12 months or more, unrealized losses 28 50
Total, fair value 85,589 34,746
Total, unrealized losses 593 227
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 0 2,899
Less than 12 months, unrealized losses 0 10
12 months or more, fair value 4,193 6,151
12 months or more, unrealized losses 208 301
Total, fair value 4,193 9,050
Total, unrealized losses 208 311
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 months, fair value 7,126 7,367
Less than 12 months, unrealized losses 87 200
12 months or more, fair value 0 0
12 months or more, unrealized losses 0 0
Total, fair value 7,126 7,367
Total, unrealized losses $ 87 $ 200