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Securities - Unrealized Loss Positions (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
security
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 11 11 14
Greater than 12 months in an unrealized loss position | security 324 324 353
Total | security 335 335 367
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 95 $ 95 $ 145
Greater than 12 months in an unrealized loss position 60,284 60,284 85,825
Total 60,379 60,379 85,970
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 76,422 76,422 28,708
Greater than 12 months in an unrealized loss position 756,987 756,987 1,030,120
Total 833,409 $ 833,409 1,058,828
Effective duration (in years)   3 years  
Credit losses were determined 0 $ 0 $ 0
Provision for credit losses on securities $ 0    
U.S. Treasury      
Securities Available-for-Sale, Number of Securities      
Greater than 12 months in an unrealized loss position | security 2 2 4
Total | security 2 2 4
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 1,196 $ 1,196 $ 5,028
Total 1,196 1,196 5,028
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 98,672 98,672 169,574
Total $ 98,672 $ 98,672 $ 169,574
U.S. government agencies      
Securities Available-for-Sale, Number of Securities      
Greater than 12 months in an unrealized loss position | security 8 8 9
Total | security 8 8 9
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 1,425 $ 1,425 $ 3,052
Total 1,425 1,425 3,052
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 37,976 37,976 56,959
Total $ 37,976 $ 37,976 $ 56,959
Mortgage Backed Securities, Issued by US Government Agencies      
Securities Available-for-Sale, Number of Securities      
Greater than 12 months in an unrealized loss position | security 128 128 128
Total | security 128 128 128
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 8,849 $ 8,849 $ 12,122
Total 8,849 8,849 12,122
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 96,413 96,413 106,370
Total $ 96,413 $ 96,413 $ 106,370
States and political subdivisions      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 2 2 12
Greater than 12 months in an unrealized loss position | security 30 30 25
Total | security 32 32 37
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 20 $ 20 $ 137
Greater than 12 months in an unrealized loss position 7,928 7,928 10,195
Total 7,948 7,948 10,332
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 12,697 12,697 27,974
Greater than 12 months in an unrealized loss position 113,587 113,587 106,138
Total $ 126,284 $ 126,284 $ 134,112
Collateralized mortgage obligations      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 2 2 2
Greater than 12 months in an unrealized loss position | security 141 141 143
Total | security 143 143 145
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 19 $ 19 $ 8
Greater than 12 months in an unrealized loss position 38,971 38,971 50,856
Total 38,990 38,990 50,864
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 1,506 1,506 734
Greater than 12 months in an unrealized loss position 346,056 346,056 376,236
Total $ 347,562 $ 347,562 $ 376,970
Asset-backed Securities      
Securities Available-for-Sale, Number of Securities      
Greater than 12 months in an unrealized loss position | security 13 13 19
Total | security 13 13 19
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 1,911 $ 1,911 $ 3,222
Total 1,911 1,911 3,222
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 51,435 51,435 63,941
Total $ 51,435 $ 51,435 $ 63,941
Collateralized loan obligations.      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 7 7  
Greater than 12 months in an unrealized loss position | security 2 2 25
Total | security 9 9 25
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 56 $ 56  
Greater than 12 months in an unrealized loss position 4 4 $ 1,350
Total 60 60 1,350
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 62,219 62,219  
Greater than 12 months in an unrealized loss position 12,848 12,848 150,902
Total $ 75,067 $ 75,067 $ 150,902