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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Number of Securities    
Less Than 12 Months | security 29 15
12 Months or More | security 114 118
Total | security 143 133
Fair Value    
Less Than 12 Months $ 162,917 $ 45,297
12 Months or More 733,806 794,365
Total 896,723 839,662
Unrealized Losses    
Less Than 12 Months (1,722) (371)
12 Months or More (83,378) (83,380)
Total $ (85,100) $ (83,751)
U.S. Treasury securities    
Number of Securities    
Less Than 12 Months | security 0 1
12 Months or More | security 12 13
Total | security 12 14
Fair Value    
Less Than 12 Months $ 0 $ 10,036
12 Months or More 113,449 123,750
Total 113,449 133,786
Unrealized Losses    
Less Than 12 Months 0 (52)
12 Months or More (9,847) (10,454)
Total $ (9,847) $ (10,506)
Obligations of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security 0 0
12 Months or More | security 4 5
Total | security 4 5
Fair Value    
Less Than 12 Months $ 0 $ 0
12 Months or More 24,786 32,513
Total 24,786 32,513
Unrealized Losses    
Less Than 12 Months 0 0
12 Months or More (524) (829)
Total $ (524) $ (829)
Collateralized mortgage obligations of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security 11 4
12 Months or More | security 60 57
Total | security 71 61
Fair Value    
Less Than 12 Months $ 108,262 $ 35,161
12 Months or More 357,948 351,220
Total 466,210 386,381
Unrealized Losses    
Less Than 12 Months (893) (318)
12 Months or More (49,930) (47,753)
Total $ (50,823) $ (48,071)
Residential mortgage-backed securities of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security 11 10
12 Months or More | security 14 14
Total | security 25 24
Fair Value    
Less Than 12 Months $ 69 $ 100
12 Months or More 35,057 37,877
Total 35,126 37,977
Unrealized Losses    
Less Than 12 Months 0 (1)
12 Months or More (7,005) (6,536)
Total $ (7,005) $ (6,537)
Commercial mortgage-backed securities of U.S. government corporations and agencies    
Number of Securities    
Less Than 12 Months | security 3 0
12 Months or More | security 24 29
Total | security 27 29
Fair Value    
Less Than 12 Months $ 30,145 $ 0
12 Months or More 202,566 249,005
Total 232,711 249,005
Unrealized Losses    
Less Than 12 Months (253) 0
12 Months or More (16,072) (17,808)
Total $ (16,325) $ (17,808)
Obligations of states and political subdivisions    
Number of Securities    
Less Than 12 Months | security 4  
12 Months or More | security 0  
Total | security 4  
Fair Value    
Less Than 12 Months $ 24,441  
12 Months or More 0  
Total 24,441  
Unrealized Losses    
Less Than 12 Months (576)  
12 Months or More 0  
Total $ (576)