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Condensed Financial Information of Parent Company (Schedule of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and due from banks | $ 17,422 | $ 11,814 |  |
Securities available-for-sale, at fair value | 470,523 | 390,552 |  |
Loans, net | 676,026 | 654,691 |  |
Premises and equipment, net | 21,586 | 21,086 |  |
Other assets | 36,369 | 36,388 |  |
Total assets | 1,603,209 | 1,504,839 | $ 1,455,506 |
Liabilities and Shareholders' Equity |  |  |  |
Accounts and drafts payable | 661,888 | 642,287 |  |
Other liabilities | 38,145 | 32,556 |  |
Total liabilities | 1,378,121 | 1,296,804 |  |
Total shareholders' equity | 225,088 | 208,035 | $ 207,378 | $ 200,432
Total liabilities and shareholders' equity | 1,603,209 | 1,504,839 |  |
Parent [Member] |  |  |  |
Assets |  |  |  |
Cash and due from banks | 56,462 | 45,464 |  |
Short-term investments | 48,324 | 107,898 |  |
Securities available-for-sale, at fair value | 470,523 | 390,552 |  |
Loans, net | 12,239 | 47,184 |  |
Investments in subsidiaries | 113,681 | 101,824 |  |
Premises and equipment, net | 20,927 | 20,375 |  |
Other assets | 199,865 | 161,317 |  |
Total assets | 922,021 | 874,614 |  |
Liabilities and Shareholders' Equity |  |  |  |
Accounts and drafts payable | 661,342 | 640,945 |  |
Other liabilities | 35,533 | 25,415 |  |
Total liabilities | 696,875 | 666,360 |  |
Total shareholders' equity | 225,146 | 208,254 |  |
Total liabilities and shareholders' equity | $ 922,021 | $ 874,614 |  |

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