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Investment Securities - Summary of Available-for-sale Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities    
Amortized Cost $ 1,189,792 $ 1,184,288
Gross Unrealized Gains 4,684 3,240
Gross Unrealized Losses (113,809) (139,206)
Fair Value [1] 1,080,667 1,048,322
U.S. Treasury and government agencies    
Schedule of Available-for-sale Securities    
Amortized Cost 28,202 30,999
Gross Unrealized Gains 361 292
Gross Unrealized Losses (602) (995)
Fair Value 27,961 30,296
U.S. government sponsored agencies    
Schedule of Available-for-sale Securities    
Amortized Cost 181,198 128,500
Gross Unrealized Gains 1,632 639
Gross Unrealized Losses (8,122) (10,532)
Fair Value 174,708 118,607
States and political subdivisions    
Schedule of Available-for-sale Securities    
Amortized Cost 229,119 239,906
Gross Unrealized Gains 353 485
Gross Unrealized Losses (22,693) (27,095)
Fair Value 206,779 213,296
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 679,575 717,772
Gross Unrealized Gains 2,319 1,819
Gross Unrealized Losses (74,168) (90,667)
Fair Value 607,726 628,924
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 65,198 60,611
Gross Unrealized Gains 16 5
Gross Unrealized Losses (7,777) (9,382)
Fair Value 57,437 51,234
Bank-issued trust preferred securities    
Schedule of Available-for-sale Securities    
Amortized Cost 6,500 6,500
Gross Unrealized Gains 3 0
Gross Unrealized Losses (447) (535)
Fair Value $ 6,056 $ 5,965
[1]     Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $236, respectively, at September 30, 2024, and $0 and $238, respectively, at December 31, 2023.