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Securities - Unrealized Loss Positions (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
security
Jun. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 40 40 14
Greater than 12 months in an unrealized loss position | security 337 337 353
Total 377 377 367
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 844,000 $ 844,000 $ 145,000
Greater than 12 months in an unrealized loss position 82,918,000 82,918,000 85,825,000
Total 83,762,000 83,762,000 85,970,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 153,920,000 153,920,000 28,708,000
Greater than 12 months in an unrealized loss position 793,910,000 793,910,000 1,030,120,000
Total 947,830,000 $ 947,830,000 1,058,828,000
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      
Less than 12 months in an unrealized loss position | security 2 2  
Greater than 12 months in an unrealized loss position | security 2 2 4
Total 4 4 4
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 12,000 $ 12,000  
Greater than 12 months in an unrealized loss position 2,475,000 2,475,000 $ 5,028,000
Total 2,487,000 2,487,000 5,028,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 29,806,000 29,806,000  
Greater than 12 months in an unrealized loss position 97,328,000 97,328,000 169,574,000
Total $ 127,134,000 $ 127,134,000 $ 169,574,000
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 8 8 9
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 2,355,000 $ 2,355,000 $ 3,052,000
Total 2,355,000 2,355,000 3,052,000
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 37,298,000 37,298,000 56,959,000
Total $ 37,298,000 $ 37,298,000 $ 56,959,000
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 128 128 128
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 12,618,000 $ 12,618,000 $ 12,122,000
Total 12,618,000 12,618,000 12,122,000
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 96,872,000 96,872,000 106,370,000
Total $ 96,872,000 $ 96,872,000 $ 106,370,000
States and political subdivisions      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 33 33 12
Greater than 12 months in an unrealized loss position | security 35 35 25
Total 68 68 37
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 763,000 $ 763,000 $ 137,000
Greater than 12 months in an unrealized loss position 11,815,000 11,815,000 10,195,000
Total 12,578,000 12,578,000 10,332,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 86,106,000 86,106,000 27,974,000
Greater than 12 months in an unrealized loss position 125,519,000 125,519,000 106,138,000
Total $ 211,625,000 $ 211,625,000 $ 134,112,000
Collateralized mortgage obligations      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security     2
Greater than 12 months in an unrealized loss position | security 142 142 143
Total 142 142 145
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position     $ 8,000
Greater than 12 months in an unrealized loss position $ 50,889,000 $ 50,889,000 50,856,000
Total 50,889,000 50,889,000 50,864,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position     734,000
Greater than 12 months in an unrealized loss position 349,308,000 349,308,000 376,236,000
Total $ 349,308,000 $ 349,308,000 $ 376,970,000
Asset-backed Securities      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 2 2  
Greater than 12 months in an unrealized loss position | security 18 18 19
Total 20 20 19
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 10,000 $ 10,000  
Greater than 12 months in an unrealized loss position 2,753,000 2,753,000 $ 3,222,000
Total 2,763,000 2,763,000 3,222,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 5,064,000 5,064,000  
Greater than 12 months in an unrealized loss position 59,306,000 59,306,000 63,941,000
Total $ 64,370,000 $ 64,370,000 $ 63,941,000
Collateralized loan obligations.      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 3 3  
Greater than 12 months in an unrealized loss position | security 4 4 25
Total 7 7 25
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 59,000 $ 59,000  
Greater than 12 months in an unrealized loss position 13,000 13,000 $ 1,350,000
Total 72,000 72,000 1,350,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 32,944,000 32,944,000  
Greater than 12 months in an unrealized loss position 28,279,000 28,279,000 150,902,000
Total $ 61,223,000 $ 61,223,000 $ 150,902,000