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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale: [Abstract] |  |
Amortized Cost | $ 1,339,032 | $ 855,163
Gross Unrealized Gains | 18,801 | 25,075
Gross Unrealized (Losses) | (10,867) | (998)
Fair Value | 1,346,966 | 879,240
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 7,026 | 5,016
Gross Unrealized Gains | 31 |
Unrealized (Losses) | 0 |
Fair Value | 7,057 | 5,119
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 194,162 | 127,067
Gross Unrealized Gains | 308 | 790
Gross Unrealized (Losses) | (2,786) | (788)
Fair Value | 191,684 | 127,069
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 5,004 | 5,016
Gross Unrealized Gains | 31 | 103
Unrealized (Losses) | 0 | 0
Fair Value | 5,035 | 5,119
Obligations of States and Political Subdivisions |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 328,394 | 237,886
Gross Unrealized Gains | 11,310 | 11,995
Gross Unrealized (Losses) | (960) | (37)
Fair Value | 338,744 | 249,844
Mortgage-backed Securities: GSE Residential |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 783,400 | 479,470
Gross Unrealized Gains | 6,300 | 12,038
Gross Unrealized (Losses) | (7,085) | (160)
Fair Value | 782,615 | 491,348
Other Securities |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 33,076 | 10,740
Gross Unrealized Gains | 883 | 252
Gross Unrealized (Losses) | (36) | (13)
Fair Value | 33,923 | $ 10,979
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 2,022 |
Gross Unrealized Gains | 0 |
Unrealized (Losses) | 0 |
Fair Value | $ 2,022 |

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