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Certificates of Deposit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Certificates of deposit less than $100,000 | $ 372,464 | $ 284,066 |
Certificates $100,000 to $250,000 | 162,185 | 232,759 |
Certificates $250,000 and over | 56,760 | 42,176 |
Total | 591,409 | 559,001 |
Maturity of certificates of deposit [Abstract] |  |  |
2019 | 411,809 |  |
2020 | 61,196 |  |
2021 | 44,607 |  |
2022 | 27,583 |  |
2023 | 46,208 |  |
2024 and thereafter | 6 |  |
Total | 591,409 | 559,001 |
Interest expense on certificates of deposit of $100,000 or greater | 3,038 | $ 2,105 | $ 1,970
Less than $100,000 |  |  |
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Total | 372,464 |  |
Maturity of certificates of deposit [Abstract] |  |  |
2019 | 303,468 |  |
2020 | 25,150 |  |
2021 | 20,073 |  |
2022 | 10,752 |  |
2023 | 13,015 |  |
2024 and thereafter | 6 |  |
Total | 372,464 |  |
$100,000 and Greater |  |  |
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Total | 218,945 |  |
Maturity of certificates of deposit [Abstract] |  |  |
2019 | 108,341 |  |
2020 | 36,046 |  |
2021 | 24,534 |  |
2022 | 16,831 |  |
2023 | 33,193 |  |
2024 and thereafter | 0 |  |
Total | $ 218,945 |  |

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