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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale: [Abstract] |  |
Amortized Cost | $ 1,432,372 | $ 1,422,591
Gross Unrealized Gains | 143 | 17,166
Gross Unrealized (Losses) | (213,530) | (18,335)
Fair Value | 1,218,985 | 1,421,422
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 2,954 | 7,030
Gross Unrealized Gains | 0 | 5
Unrealized (Losses) | 0 | 0
Fair Value | 2,954 | 7,035
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 252,934 | 208,598
Gross Unrealized Gains | 0 | 80
Gross Unrealized (Losses) | (32,407) | (4,863)
Fair Value | 220,527 | 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 | 347,409 | 383,991
Gross Unrealized Gains | 134 | 12,123
Gross Unrealized (Losses) | (59,845) | (657)
Fair Value | 287,698 | 395,457
Mortgage-backed Securities: GSE Residential |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 744,636 | 799,456
Gross Unrealized Gains | 3 | 4,292
Gross Unrealized (Losses) | (116,759) | (12,710)
Fair Value | 627,880 | 791,038
Other Securities |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 87,393 | 30,546
Gross Unrealized Gains | 6 | 671
Gross Unrealized (Losses) | (4,519) | (105)
Fair Value | 82,880 | 31,112
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 2,954 | 2,029
Gross Unrealized Gains | 0 | 0
Unrealized (Losses) | 0 | 0
Fair Value | $ 2,954 | $ 2,029

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