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Investment Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities    
Amortized Cost $ 1,349,800 $ 1,283,146
Gross Unrealized Gains 1,215 10,079
Gross Unrealized Losses (181,171) (17,732)
Available-for-sale securities [1] 1,169,844 1,275,493
U.S. Treasury and government agencies    
Schedule of Available-for-sale Securities    
Amortized Cost 178,824 35,609
Gross Unrealized Gains 0 12
Gross Unrealized Losses (6,769) (17)
Available-for-sale securities 172,055 35,604
U.S. government sponsored agencies    
Schedule of Available-for-sale Securities    
Amortized Cost 94,517 83,019
Gross Unrealized Gains 4 58
Gross Unrealized Losses (13,606) (1,338)
Available-for-sale securities 80,915 81,739
States and political subdivisions    
Schedule of Available-for-sale Securities    
Amortized Cost 270,761 259,508
Gross Unrealized Gains 21 3,187
Gross Unrealized Losses (40,760) (3,376)
Available-for-sale securities 230,022 259,319
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 731,125 833,328
Gross Unrealized Gains 1,140 6,565
Gross Unrealized Losses (108,204) (11,376)
Available-for-sale securities 624,061 828,517
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 63,821 64,971
Gross Unrealized Gains 1 42
Gross Unrealized Losses (11,318) (1,494)
Available-for-sale securities 52,504 63,519
Bank-issued trust preferred securities    
Schedule of Available-for-sale Securities    
Amortized Cost 10,752 6,711
Gross Unrealized Gains 49 215
Gross Unrealized Losses (514) (131)
Available-for-sale securities $ 10,287 $ 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 $238, respectively, at September 30, 2022 and $0 and $286, respectively, at December 31, 2021.