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Investment Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities    
Amortized cost $ 1,300,719 $ 1,283,146
Gross Unrealized Gains 1,104 10,079
Gross Unrealized Losses (170,424) (17,732)
Available-for-sale securities [1] 1,131,399 1,275,493
U.S. Treasury and government agencies    
Schedule of Available-for-sale Securities    
Amortized cost 158,473 35,609
Gross Unrealized Gains 0 12
Gross Unrealized Losses (6,051) (17)
Available-for-sale securities 152,422 35,604
U.S. government sponsored agencies    
Schedule of Available-for-sale Securities    
Amortized cost 101,753 83,019
Gross Unrealized Gains 18 58
Gross Unrealized Losses (13,656) (1,338)
Available-for-sale securities 88,115 81,739
States and political subdivisions    
Schedule of Available-for-sale Securities    
Amortized cost 261,612 259,508
Gross Unrealized Gains 12 3,187
Gross Unrealized Losses (35,742) (3,376)
Available-for-sale securities 225,882 259,319
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized cost 707,025 833,328
Gross Unrealized Gains 1,017 6,565
Gross Unrealized Losses (103,389) (11,376)
Available-for-sale securities 604,653 828,517
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized cost 61,091 64,971
Gross Unrealized Gains 0 42
Gross Unrealized Losses (11,042) (1,494)
Available-for-sale securities 50,049 63,519
Bank-issued trust preferred securities    
Schedule of Available-for-sale Securities    
Amortized cost 10,765 6,711
Gross Unrealized Gains 57 215
Gross Unrealized Losses (544) (131)
Available-for-sale securities $ 10,278 $ 6,795
[1] Available-for-sale investment securities and held-to-maturity investment securities are presented net of allowance for credit losses of $0 and $241, respectively, as of December 31, 2022 and $0 and $286, respectively, at December 31, 2021.