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Investment securities (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Less Than 12 Months, Fair Value | $ 265,200 | $ 224,680
Less Than 12 Months, Unrealized Losses | 20,541 | 4,548
12 Months Or More, Fair Value | 46,284 | 28,817
12 Months Or More, Unrealized Losses | 4,675 | 988
Total, Fair Value | 311,484 | 253,497
Total, Unrealized Losses | 25,216 | 5,536
Mortgage-backed securities |  |
Less Than 12 Months, Fair Value | 146,319 | 131,483
Less Than 12 Months, Unrealized Losses | 8,509 | 2,477
12 Months Or More, Fair Value | 21,727 | 19,632
12 Months Or More, Unrealized Losses | 1,392 | 542
Total, Fair Value | 168,046 | 151,115
Total, Unrealized Losses | 9,901 | 3,019
State and political subdivisions |  |
Less Than 12 Months, Fair Value | 106,097 | 80,076
Less Than 12 Months, Unrealized Losses | 11,285 | 1,981
12 Months Or More, Fair Value | 16,608 | 5,922
12 Months Or More, Unrealized Losses | 3,093 | 276
Total, Fair Value | 122,705 | 85,998
Total, Unrealized Losses | 14,378 | 2,257
US Treasury Securities [Member] |  |
Less Than 12 Months, Fair Value | 10,369 | 7,889
Less Than 12 Months, Unrealized Losses | 565 | 75
12 Months Or More, Fair Value | 0 | 0
12 Months Or More, Unrealized Losses | 0 | 0
Total, Fair Value | 10,369 | 7,889
Total, Unrealized Losses | 565 | 75
U.S. Government Sponsored Enterprises [Member] |  |
Less Than 12 Months, Fair Value | 2,415 | 5,232
Less Than 12 Months, Unrealized Losses | 182 | 15
12 Months Or More, Fair Value | 7,949 | 3,263
12 Months Or More, Unrealized Losses | 190 | 170
Total, Fair Value | 10,364 | 8,495
Total, Unrealized Losses | $ 372 | $ 185

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