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Investment Securities (Details 1) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Less than 12 months, fair value $ 33,158 $ 199,903
Less than 12 months, unrealized losses 1,336 16,697
12 months or more, fair value 340,845 212,326
12 months or more, unrealized losses 64,930 45,631
Total, fair value 374,003 412,229
Total, unrealized losses 66,266 62,328
U.S Treasuries [Member]    
Less than 12 months, fair value 0 2,878
Less than 12 months, unrealized losses 0 104
12 months or more, fair value 9,838 6,936
12 months or more, unrealized losses 1,130 1,033
Total, fair value 9,838 9,814
Total, unrealized losses 1,130 1,137
U.S. Government sponsored enterprises    
Less than 12 months, fair value 0 2,904
Less than 12 months, unrealized losses 0 87
12 months or more, fair value 10,745 8,635
12 months or more, unrealized losses 765 619
Total, fair value 10,745 11,539
Total, unrealized losses 765 706
Mortgage-backed securities    
Less than 12 months, fair value 33,158 128,241
Less than 12 months, unrealized losses 1,336 8,740
12 months or more, fair value 221,918 120,464
12 months or more, unrealized losses 31,379 17,089
Total, fair value 255,076 248,705
Total, unrealized losses 32,715 25,829
State and political subdivisions    
Less than 12 months, fair value 0 65,880
Less than 12 months, unrealized losses 0 7,766
12 months or more, fair value 98,344 76,291
12 months or more, unrealized losses 31,656 26,890
Total, fair value 98,344 142,171
Total, unrealized losses $ 31,656 $ 34,656