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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale: [Abstract] |  |
Amortized Cost | $ 1,209,831 | $ 855,163
Gross Unrealized Gains | 19,913 | 25,075
Gross Unrealized (Losses) | (7,546) | (998)
Fair Value | 1,222,198 | 879,240
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 7,049 | 5,016
Gross Unrealized Gains | 56 |
Unrealized (Losses) | 0 |
Fair Value | 7,105 | 5,119
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 194,722 | 127,067
Gross Unrealized Gains | 310 | 790
Gross Unrealized (Losses) | (2,853) | (788)
Fair Value | 192,179 | 127,069
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 5,008 | 5,016
Gross Unrealized Gains | 56 | 103
Unrealized (Losses) | 0 | 0
Fair Value | 5,064 | 5,119
Obligations of States and Political Subdivisions |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 294,255 | 237,886
Gross Unrealized Gains | 11,751 | 11,995
Gross Unrealized (Losses) | (380) | (37)
Fair Value | 305,626 | 249,844
Mortgage-backed Securities: GSE Residential |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 685,736 | 479,470
Gross Unrealized Gains | 7,119 | 12,038
Gross Unrealized (Losses) | (4,285) | (160)
Fair Value | 688,570 | 491,348
Other Securities |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 35,118 | 10,740
Gross Unrealized Gains | 733 | 252
Gross Unrealized (Losses) | (28) | (13)
Fair Value | 35,823 | $ 10,979
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 2,041 |
Gross Unrealized Gains | 0 |
Unrealized (Losses) | 0 |
Fair Value | $ 2,041 |

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