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Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value $ 50,769 $ 107,930
Less than 12 months, unrealized loss $ 625 $ 1,532
Less than 12 months, Number of securities | security 52 132
12 months or more, fair value $ 823,889 $ 831,720
12 months or more, unrealized loss $ 113,184 $ 137,674
12 months or more, Number of securities | security 441 420
Total fair value $ 874,658 $ 939,650
Total unrealized loss 113,809 139,206
U.S. Treasury and government agencies    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 1,456 8,568
Less than 12 months, unrealized loss $ 7 $ 83
Less than 12 months, Number of securities | security 6 22
12 months or more, fair value $ 13,408 $ 11,631
12 months or more, unrealized loss $ 595 $ 912
12 months or more, Number of securities | security 11 5
Total fair value $ 14,864 $ 20,199
Total unrealized loss 602 995
U.S. government sponsored agencies    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 32,550 14,439
Less than 12 months, unrealized loss $ 376 $ 35
Less than 12 months, Number of securities | security 12 4
12 months or more, fair value $ 72,534 $ 74,211
12 months or more, unrealized loss $ 7,746 $ 10,497
12 months or more, Number of securities | security 13 15
Total fair value $ 105,084 $ 88,650
Total unrealized loss 8,122 10,532
States and political subdivisions    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 9,831 18,268
Less than 12 months, unrealized loss $ 125 $ 136
Less than 12 months, Number of securities | security 30 32
12 months or more, fair value $ 167,599 $ 167,346
12 months or more, unrealized loss $ 22,568 $ 26,959
12 months or more, Number of securities | security 134 138
Total fair value $ 177,430 $ 185,614
Total unrealized loss 22,693 27,095
Residential mortgage-backed securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 4,941 58,671
Less than 12 months, unrealized loss $ 108 $ 1,150
Less than 12 months, Number of securities | security 3 66
12 months or more, fair value $ 517,339 $ 529,895
12 months or more, unrealized loss $ 74,060 $ 89,517
12 months or more, Number of securities | security 256 238
Total fair value $ 522,280 $ 588,566
Total unrealized loss 74,168 90,667
Commercial mortgage-backed securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 0 6,000
Less than 12 months, unrealized loss $ 0 $ 112
Less than 12 months, Number of securities | security 0 7
12 months or more, fair value $ 49,447 $ 44,656
12 months or more, unrealized loss $ 7,777 $ 9,270
12 months or more, Number of securities | security 25 21
Total fair value $ 49,447 $ 50,656
Total unrealized loss 7,777 9,382
Bank-issued trust preferred securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 1,991 1,984
Less than 12 months, unrealized loss $ 9 $ 16
Less than 12 months, Number of securities | security 1 1
12 months or more, fair value $ 3,562 $ 3,981
12 months or more, unrealized loss $ 438 $ 519
12 months or more, Number of securities | security 2 3
Total fair value $ 5,553 $ 5,965
Total unrealized loss $ 447 $ 535