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Certificates of Deposit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Certificates of deposit less than $100,000 | $ 195,115 | $ 158,529 |
Certificates $100,000 to $250,000 | 240,904 | 175,077 |
Certificates $250,000 and over | 40,601 | 37,376 |
Total | 476,620 | 370,982 |
Maturity of certificates of deposit [Abstract] |  |  |
2017 | 321,537 |  |
2018 | 30,858 |  |
2019 | 45,272 |  |
2020 | 45,912 |  |
2021 | 32,464 |  |
2022 and thereafter | 577 |  |
Total | 476,620 | 370,982 |
Interest expense on certificates of deposit of $100,000 or greater | 1,970 | $ 2,431 | $ 2,823
Less than $100,000 |  |  |
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Total | 195,115 |  |
Maturity of certificates of deposit [Abstract] |  |  |
2017 | 132,813 |  |
2018 | 13,346 |  |
2019 | 20,991 |  |
2020 | 14,597 |  |
2021 | 13,313 |  |
2022 and thereafter | 55 |  |
Total | 195,115 |  |
$100,000 and Greater |  |  |
Maturities Of Certificates Of Deposit [Line Items] |  |  |
Total | 281,505 |  |
Maturity of certificates of deposit [Abstract] |  |  |
2017 | 188,724 |  |
2018 | 17,512 |  |
2019 | 24,281 |  |
2020 | 31,315 |  |
2021 | 19,151 |  |
2022 and thereafter | 522 |  |
Total | $ 281,505 |  |

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