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Investment Securities - Held-to-maturity Securities with Unrealized Loss (Details)
$ in Thousands
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value $ 261,399 $ 161,946
Less than 12 months, unrealized loss $ 6,070 $ 5,277
Less than 12 months, no. of securities | security 60 49
12 months or more, fair value $ 297,104 $ 265,877
12 months or more, unrealized loss $ 74,259 $ 76,962
12 months or more, no. of securities | security 136 120
Total fair value $ 558,503 $ 427,823
Total unrealized loss 80,329 82,239
U.S. government sponsored agencies    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 124,952 59,905
Less than 12 months, unrealized loss $ 1,612 $ 651
Less than 12 months, no. of securities | security 26 17
12 months or more, fair value $ 31,766 $ 29,306
12 months or more, unrealized loss $ 8,255 $ 8,825
12 months or more, no. of securities | security 10 9
Total fair value $ 156,718 $ 89,211
Total unrealized loss 9,867 9,476
States and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 0 3,590
Less than 12 months, unrealized loss $ 0 $ 1,072
Less than 12 months, no. of securities | security 0 3
12 months or more, fair value $ 109,514 $ 101,863
12 months or more, unrealized loss $ 31,991 $ 35,336
12 months or more, no. of securities | security 67 64
Total fair value $ 109,514 $ 105,453
Total unrealized loss 31,991 36,408
Residential mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 117,092 71,582
Less than 12 months, unrealized loss $ 3,598 $ 2,904
Less than 12 months, no. of securities | security 29 21
12 months or more, fair value $ 83,902 $ 72,862
12 months or more, unrealized loss $ 16,728 $ 15,557
12 months or more, no. of securities | security 26 18
Total fair value $ 200,994 $ 144,444
Total unrealized loss 20,326 18,461
Commercial mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 months, fair value 19,355 26,869
Less than 12 months, unrealized loss $ 860 $ 650
Less than 12 months, no. of securities | security 5 8
12 months or more, fair value $ 71,922 $ 61,846
12 months or more, unrealized loss $ 17,285 $ 17,244
12 months or more, no. of securities | security 33 29
Total fair value $ 91,277 $ 88,715
Total unrealized loss $ 18,145 $ 17,894