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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Available-for-sale: [Abstract]    
Amortized Cost $ 1,255,703 $ 1,257,436
Gross Unrealized Gains 1,479 690
Gross Unrealized (Losses) (180,341) (194,834)
Fair Value 1,076,841 1,063,292
Held-to-maturity: [Abstract]    
Held-to-maturity 2,287 2,279
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Fair Value 2,287 2,279
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies    
Available-for-sale: [Abstract]    
Amortized Cost 199,299 212,513
Gross Unrealized Gains 0 3
Gross Unrealized (Losses) (15,683) (21,158)
Fair Value 183,616 191,358
Obligations of States and Political Subdivisions    
Available-for-sale: [Abstract]    
Amortized Cost 325,609 324,046
Gross Unrealized Gains 202 135
Gross Unrealized (Losses) (64,487) (56,441)
Fair Value 261,324 267,740
Mortgage-backed Securities: GSE Residential    
Available-for-sale: [Abstract]    
Amortized Cost 685,640 653,760
Gross Unrealized Gains 1,277 552
Gross Unrealized (Losses) (98,206) (114,570)
Fair Value 588,711 539,742
Other Securities    
Available-for-sale: [Abstract]    
Amortized Cost 45,155 67,117
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) (1,965) (2,665)
Fair Value 43,190 64,452
Other Investments    
Held-to-maturity: [Abstract]    
Held-to-maturity 2,287 2,279
Gross Unrealized Gains 0 0
Gross Unrealized (Losses) 0 0
Fair Value $ 2,287 $ 2,279