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Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Marketable Securities [Line Items] |  |  |
Available-for-Sale Securities, Amortized Cost Basis | $ 596,819 |  | $ 560,688
Available-for-Sale Securities | 577,820 | $ 564,839 | $ 564,839
Available-for-Sale Securities, Gross Unrealized Gain | 1,689 | 9,178 |
Available-for-Sale Securities, Gross Unrealized Loss | 20,688 | 5,027 |
US Treasury Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-Sale Securities, Amortized Cost Basis | 60,406 | 15,736 |
Available-for-Sale Securities | 58,595 | 15,436 |
Available-for-Sale Securities, Gross Unrealized Gain |  |  |
Available-for-Sale Securities, Gross Unrealized Loss | 1,811 | 300 |
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-Sale Securities, Amortized Cost Basis | 2,499 | 2,499 |
Available-for-Sale Securities | 2,317 | 2,501 |
Available-for-Sale Securities, Gross Unrealized Gain |  | 2 |
Available-for-Sale Securities, Gross Unrealized Loss | 182 | 0 |
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-Sale Securities, Amortized Cost Basis | 391,271 | 398,125 |
Available-for-Sale Securities | 378,348 | 397,729 |
Available-for-Sale Securities, Gross Unrealized Gain | 217 | 3,596 |
Available-for-Sale Securities, Gross Unrealized Loss | 13,140 | 3,992 |
Small Business Administration pools [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-Sale Securities, Amortized Cost Basis | 28,112 | 30,835 |
Available-for-Sale Securities | 27,984 | 31,273 |
Available-for-Sale Securities, Gross Unrealized Gain | 209 | 505 |
Available-for-Sale Securities, Gross Unrealized Loss | 337 | 67 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-Sale Securities, Amortized Cost Basis | 105,757 | 105,469 |
Available-for-Sale Securities | 101,971 | 109,848 |
Available-for-Sale Securities, Gross Unrealized Gain | 1,182 | 4,918 |
Available-for-Sale Securities, Gross Unrealized Loss | 4,968 | 539 |
Corporate and other securities [Member] |  |  |
Marketable Securities [Line Items] |  |  |
Available-for-Sale Securities, Amortized Cost Basis | 8,774 | 8,024 |
Available-for-Sale Securities | 8,605 | 8,052 |
Available-for-Sale Securities, Gross Unrealized Gain | 81 | 157 |
Available-for-Sale Securities, Gross Unrealized Loss | $ 250 | $ 129 |

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