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v3.22.1

Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Available-for-sale: [Abstract] |  |  |
Amortized Cost | $ 1,571,215 | $ 1,422,591 |
Gross Unrealized Gains | 3,269 | 17,166 |
Gross Unrealized (Losses) | (107,534) | (18,335) |
Fair Value | 1,466,950 | 1,421,422 |
Held-to-maturity: [Abstract] |  |  |
Held-to-maturity | 2,998 | 7,030 |
Gross Unrealized Gains | 0 | 5 |
Unrealized (Losses) | 0 | 0 |
Fair Value | 2,998 | 7,035 | $ 7,035
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 264,466 | 208,598 |
Gross Unrealized Gains | 37 | 80 |
Gross Unrealized (Losses) | (16,527) | (4,863) |
Fair Value | 247,976 | 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 | 386,489 | 383,991 |
Gross Unrealized Gains | 2,713 | 12,123 |
Gross Unrealized (Losses) | (30,523) | (657) |
Fair Value | 358,679 | 395,457 |
Mortgage-backed Securities: GSE Residential |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 820,448 | 799,456 |
Gross Unrealized Gains | 245 | 4,292 |
Gross Unrealized (Losses) | (59,166) | (12,710) |
Fair Value | 761,527 | 791,038 |
Other Securities |  |  |
Available-for-sale: [Abstract] |  |  |
Amortized Cost | 99,812 | 30,546 |
Gross Unrealized Gains | 274 | 671 |
Gross Unrealized (Losses) | (1,318) | (105) |
Fair Value | 98,768 | 31,112 |
Other Investments |  |  |
Held-to-maturity: [Abstract] |  |  |
Held-to-maturity | 2,998 | 2,029 |
Gross Unrealized Gains | 0 | 0 |
Unrealized (Losses) | 0 | 0 |
Fair Value | $ 2,998 | $ 2,029 |

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