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Investment Securities - Summary of Available-for-sale Securities with Unrealized Loss (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value $ 144,217 $ 107,930
Less than 12 months, unrealized loss $ 1,147 $ 1,532
Less than 12 months, Number of securities | security 95 132
12 months or more, fair value $ 864,017 $ 831,720
12 months or more, unrealized loss $ 147,657 $ 137,674
12 months or more, Number of securities | security 509 420
Total fair value $ 1,008,234 $ 939,650
Total unrealized loss 148,804 139,206
U.S. Treasury and government agencies    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 6,912 8,568
Less than 12 months, unrealized loss $ 71 $ 83
Less than 12 months, Number of securities | security 9 22
12 months or more, fair value $ 17,240 $ 11,631
12 months or more, unrealized loss $ 1,068 $ 912
12 months or more, Number of securities | security 19 5
Total fair value $ 24,152 $ 20,199
Total unrealized loss 1,139 995
U.S. government sponsored agencies    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 86,183 14,439
Less than 12 months, unrealized loss $ 117 $ 35
Less than 12 months, Number of securities | security 10 4
12 months or more, fair value $ 80,062 $ 74,211
12 months or more, unrealized loss $ 10,575 $ 10,497
12 months or more, Number of securities | security 16 15
Total fair value $ 166,245 $ 88,650
Total unrealized loss 10,692 10,532
States and political subdivisions    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 20,633 18,268
Less than 12 months, unrealized loss $ 675 $ 136
Less than 12 months, Number of securities | security 54 32
12 months or more, fair value $ 171,173 $ 167,346
12 months or more, unrealized loss $ 29,044 $ 26,959
12 months or more, Number of securities | security 149 138
Total fair value $ 191,806 $ 185,614
Total unrealized loss 29,719 27,095
Residential mortgage-backed securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 28,049 58,671
Less than 12 months, unrealized loss $ 271 $ 1,150
Less than 12 months, Number of securities | security 20 66
12 months or more, fair value $ 542,532 $ 529,895
12 months or more, unrealized loss $ 96,913 $ 89,517
12 months or more, Number of securities | security 295 238
Total fair value $ 570,581 $ 588,566
Total unrealized loss 97,184 90,667
Commercial mortgage-backed securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 451 6,000
Less than 12 months, unrealized loss $ 2 $ 112
Less than 12 months, Number of securities | security 1 7
12 months or more, fair value $ 49,464 $ 44,656
12 months or more, unrealized loss $ 9,604 $ 9,270
12 months or more, Number of securities | security 28 21
Total fair value $ 49,915 $ 50,656
Total unrealized loss 9,606 9,382
Bank-issued trust preferred securities    
Available-for-sale securities that had an unrealized loss:    
Less than 12 months, fair value 1,989 1,984
Less than 12 months, unrealized loss $ 11 $ 16
Less than 12 months, Number of securities | security 1 1
12 months or more, fair value $ 3,546 $ 3,981
12 months or more, unrealized loss $ 453 $ 519
12 months or more, Number of securities | security 2 3
Total fair value $ 5,535 $ 5,965
Total unrealized loss $ 464 $ 535