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Certificates of Deposit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Certificates of deposit less than $100,000 | $ 246,875 | $ 277,225 |
Certificates $100,000 to $250,000 | 295,672 | 345,241 |
Certificates $250,000 and over | 63,038 | 67,513 |
Total | 605,585 | 689,979 |
Maturity of certificates of deposit [Abstract] |  |  |
2021 | 500,339 |  |
2022 | 38,300 |  |
2023 | 47,183 |  |
2024 | 9,488 |  |
2025 | 10,131 |  |
2026 and thereafter | 144 |  |
Total | 605,585 | 689,979 |
Interest expense on certificates of deposit of $100,000 or greater | 5,327 | $ 6,060 | $ 3,038
Less than $100,000 |  |  |
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Total | 246,875 |  |
Maturity of certificates of deposit [Abstract] |  |  |
2021 | 205,853 |  |
2022 | 16,889 |  |
2023 | 14,064 |  |
2024 | 4,562 |  |
2025 | 5,363 |  |
2026 and thereafter | 144 |  |
Total | 246,875 |  |
$100,000 and Greater |  |  |
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Total | 358,710 |  |
Maturity of certificates of deposit [Abstract] |  |  |
2021 | 294,486 |  |
2022 | 21,411 |  |
2023 | 33,119 |  |
2024 | 4,926 |  |
2025 | 4,768 |  |
2026 and thereafter | 0 |  |
Total | $ 358,710 |  |

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