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Investment securities (Details 1) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Less Than 12 Months, Fair Value $ 234,370 $ 224,680
Less Than 12 Months, Unrealized Losses 24,422 4,548
12 Months Or More, Fair Value 180,215 28,817
12 Months Or More, Unrealized Losses 35,397 988
Total, Fair Value 414,585 253,497
Total, Unrealized Losses 59,819 5,536
U.S. Government Sponsored Enterprises    
Less Than 12 Months, Fair Value 5,098 5,232
Less Than 12 Months, Unrealized Losses 513 15
12 Months Or More, Fair Value 7,044 3,263
12 Months Or More, Unrealized Losses 172 170
Total, Fair Value 12,142 8,495
Total, Unrealized Losses 685 185
Mortgage-backed securities    
Less Than 12 Months, Fair Value 136,374 131,483
Less Than 12 Months, Unrealized Losses 9,243 2,477
12 Months Or More, Fair Value 109,222 19,632
12 Months Or More, Unrealized Losses 15,333 542
Total, Fair Value 245,596 151,115
Total, Unrealized Losses 24,576 3,019
State and political subdivisions    
Less Than 12 Months, Fair Value 90,030 80,076
Less Than 12 Months, Unrealized Losses 14,557 1,981
12 Months Or More, Fair Value 57,040 5,922
12 Months Or More, Unrealized Losses 18,832 276
Total, Fair Value 147,070 85,998
Total, Unrealized Losses 33,389 2,257
US Treasury Securities [Member]    
Less Than 12 Months, Fair Value 2,868 7,889
Less Than 12 Months, Unrealized Losses 109 75
12 Months Or More, Fair Value 6,909 0
12 Months Or More, Unrealized Losses 1,060 0
Total, Fair Value 9,777 7,889
Total, Unrealized Losses $ 1,169 $ 75