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Investment Securities - Summary of Held-to-maturity Securities with Unrealized Loss (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value $ 142,755 $ 277,526
Less than 12 months, unrealized loss $ 1,567 $ 6,697
Less than 12 months, no. of securities | security 21 62
12 months or more, fair value $ 421,226 $ 346,649
12 months or more, unrealized loss $ 62,420 $ 76,214
12 months or more, no. of securities | security 164 149
Total fair value $ 563,981 $ 624,175
Total unrealized loss 63,987 82,911
U.S. government sponsored agencies    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 102,454 150,390
Less than 12 months, unrealized loss $ 1,154 $ 2,464
Less than 12 months, no. of securities | security 12 29
12 months or more, fair value $ 78,314 $ 38,901
12 months or more, unrealized loss $ 6,883 $ 7,763
12 months or more, no. of securities | security 19 11
Total fair value $ 180,768 $ 189,291
Total unrealized loss 8,037 10,227
States and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 924 957
Less than 12 months, unrealized loss $ 79 $ 44
Less than 12 months, no. of securities | security 1 1
12 months or more, fair value $ 111,365 $ 106,716
12 months or more, unrealized loss $ 26,437 $ 31,672
12 months or more, no. of securities | security 66 66
Total fair value $ 112,289 $ 107,673
Total unrealized loss 26,516 31,716
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 37,817 116,576
Less than 12 months, unrealized loss $ 322 $ 2,808
Less than 12 months, no. of securities | security 7 27
12 months or more, fair value $ 152,215 $ 130,556
12 months or more, unrealized loss $ 16,039 $ 21,485
12 months or more, no. of securities | security 47 43
Total fair value $ 190,032 $ 247,132
Total unrealized loss 16,361 24,293
Commercial mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 1,560 9,603
Less than 12 months, unrealized loss $ 12 $ 1,381
Less than 12 months, no. of securities | security 1 5
12 months or more, fair value $ 79,332 $ 70,476
12 months or more, unrealized loss $ 13,061 $ 15,294
12 months or more, no. of securities | security 32 29
Total fair value $ 80,892 $ 80,079
Total unrealized loss $ 13,073 $ 16,675