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Investment Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Available-for-sale Securities    
Amortized Cost $ 1,389,621 $ 1,283,146
Gross Unrealized Gains 2,000 10,079
Gross Unrealized Losses (124,023) (17,732)
Available-for-sale securities [1] 1,267,598 1,275,493
U.S. Treasury and government agencies    
Schedule of Available-for-sale Securities    
Amortized Cost 179,095 35,609
Gross Unrealized Gains 0 12
Gross Unrealized Losses (3,840) (17)
Available-for-sale securities 175,255 35,604
U.S. government sponsored agencies    
Schedule of Available-for-sale Securities    
Amortized Cost 92,245 83,019
Gross Unrealized Gains 4 58
Gross Unrealized Losses (9,784) (1,338)
Available-for-sale securities 82,465 81,739
States and political subdivisions    
Schedule of Available-for-sale Securities    
Amortized Cost 278,567 259,508
Gross Unrealized Gains 250 3,187
Gross Unrealized Losses (29,415) (3,376)
Available-for-sale securities 249,402 259,319
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 762,511 833,328
Gross Unrealized Gains 1,678 6,565
Gross Unrealized Losses (72,454) (11,376)
Available-for-sale securities 691,735 828,517
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 66,465 64,971
Gross Unrealized Gains 5 42
Gross Unrealized Losses (8,169) (1,494)
Available-for-sale securities 58,301 63,519
Bank-issued trust preferred securities    
Schedule of Available-for-sale Securities    
Amortized Cost 10,738 6,711
Gross Unrealized Gains 63 215
Gross Unrealized Losses (361) (131)
Available-for-sale securities $ 10,440 $ 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 $286, respectively, at June 30, 2022 and $0 and $286, respectively, at December 31, 2021.