Condensed Financial Information of Parent Company (Schedule of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 11,814	$ 9,015
Securities available-for-sale, at fair value	390,552	375,696
Loans, net	654,691	647,420
Premises and equipment, net	21,086	19,648
Other assets	36,388	24,116
Total assets	1,504,839	1,455,506	$ 1,500,731
Liabilities and Shareholders' Equity
Accounts and drafts payable	642,287	577,259
Other liabilities	32,556	24,385
Total liabilities	1,296,804	1,248,128
Total shareholders equity	208,035	207,378	$ 200,432	$ 190,427
Total liabilities and shareholders' equity	1,504,839	1,455,506
Parent [Member]
Assets
Cash and due from banks	45,464	30,165
Short-term investments	107,898	50,689
Securities available-for-sale, at fair value	390,552	373,946
Loans, net	47,184	87,615
Investments in subsidiaries	101,824	91,770
Premises and equipment, net	20,375	18,886
Other assets	161,317	150,135
Total assets	874,614	803,206
Liabilities and Shareholders' Equity
Accounts and drafts payable	640,945	576,919
Other liabilities	25,415	18,732
Total liabilities	666,360	595,651
Total shareholders equity	208,254	207,555
Total liabilities and shareholders' equity	$ 874,614	$ 803,206