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Investment Securities - Summary of Held-to-maturity Securities with Unrealized Loss (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value $ 14,435 $ 122,785
Less than 12 months, unrealized loss $ 1,042 $ 3,306
Less than 12 months, no. of securities | security 4 34
12 months or more, fair value $ 371,336 $ 386,135
12 months or more, unrealized loss $ 60,164 $ 70,595
12 months or more, no. of securities | security 151 150
Total fair value $ 385,771 $ 508,920
Total unrealized loss 61,206 73,901
U.S. government sponsored agencies    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 0 64,487
Less than 12 months, unrealized loss $ 0 $ 356
Less than 12 months, no. of securities | security 0 14
12 months or more, fair value $ 46,022 $ 86,071
12 months or more, unrealized loss $ 6,266 $ 7,783
12 months or more, no. of securities | security 13 18
Total fair value $ 46,022 $ 150,558
Total unrealized loss 6,266 8,139
States and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 0 0
Less than 12 months, unrealized loss $ 0 $ 0
Less than 12 months, no. of securities | security 0 0
12 months or more, fair value $ 112,398 $ 111,040
12 months or more, unrealized loss $ 26,166 $ 30,104
12 months or more, no. of securities | security 66 67
Total fair value $ 112,398 $ 111,040
Total unrealized loss 26,166 30,104
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 11,264 44,379
Less than 12 months, unrealized loss $ 96 $ 1,105
Less than 12 months, no. of securities | security 1 14
12 months or more, fair value $ 139,351 $ 117,654
12 months or more, unrealized loss $ 15,292 $ 17,477
12 months or more, no. of securities | security 43 34
Total fair value $ 150,615 $ 162,033
Total unrealized loss 15,388 18,582
Commercial mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 3,171 13,919
Less than 12 months, unrealized loss $ 946 $ 1,845
Less than 12 months, no. of securities | security 3 6
12 months or more, fair value $ 73,565 $ 71,370
12 months or more, unrealized loss $ 12,440 $ 15,231
12 months or more, no. of securities | security 29 31
Total fair value $ 76,736 $ 85,289
Total unrealized loss $ 13,386 $ 17,076