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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Available-for-sale: [Abstract]    
Amortized Cost $ 1,530,566 $ 1,422,591
Gross Unrealized Gains 752 17,166
Gross Unrealized (Losses) (181,370) (18,335)
Fair Value 1,349,948 1,421,422
Held-to-maturity: [Abstract]    
Held-to-maturity 2,972 7,030
Gross Unrealized Gains 0 5
Unrealized (Losses) 0 0
Fair Value 2,972 7,035
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies    
Available-for-sale: [Abstract]    
Amortized Cost 261,387 208,598
Gross Unrealized Gains 8 80
Gross Unrealized (Losses) (24,548) (4,863)
Fair Value 236,847 203,815
Held-to-maturity: [Abstract]    
Held-to-maturity   5,001
Gross Unrealized Gains   5
Unrealized (Losses)   0
Fair Value   5,006
Obligations of States and Political Subdivisions    
Available-for-sale: [Abstract]    
Amortized Cost 385,688 383,991
Gross Unrealized Gains 678 12,123
Gross Unrealized (Losses) (58,544) (657)
Fair Value 327,822 395,457
Mortgage-backed Securities: GSE Residential    
Available-for-sale: [Abstract]    
Amortized Cost 793,979 799,456
Gross Unrealized Gains 37 4,292
Gross Unrealized (Losses) (95,673) (12,710)
Fair Value 698,343 791,038
Other Securities    
Available-for-sale: [Abstract]    
Amortized Cost 89,512 30,546
Gross Unrealized Gains 29 671
Gross Unrealized (Losses) (2,605) (105)
Fair Value 86,936 31,112
Other Investments    
Held-to-maturity: [Abstract]    
Held-to-maturity 2,972 2,029
Gross Unrealized Gains 0 0
Unrealized (Losses) 0 0
Fair Value $ 2,972 $ 2,029