Disclosures about Fair Value of Financial Instruments (Summary of the Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value Disclosures [Abstract]
Cash and cash equivalents, Carrying Amount	$ 225,262	$ 141,088	$ 235,962	$ 138,929
Securities available-for-sale, at fair value	317,767	341,935
Loans, net, Carrying Amount	640,498	675,376
Accrued interest receivable, Carrying Amount	6,030	6,276
Assets, Carrying Amount	1,189,557	1,164,675
Cash and cash equivalents, Fair Value	225,262	141,088
Investment in securities, Fair Value	317,767	341,935
Loans, net, Fair Value	642,543	676,675
Accrued interest receivable, Fair Value	6,030	6,276
Assets, Fair Value	1,191,602	1,165,974
Deposits, Carrying Amount	582,496	563,708
Accounts and drafts payable, Carrying Amount	543,953	522,761
Accrued interest payable, Carrying Amount	88	112
Liabilities, Carrying Amount	1,126,537	1,086,581
Deposits, Fair Value	583,989	564,189
Accounts and drafts payable, Fair Value	543,953	522,761
Accrued interest payable, Fair Value	88	112
Liabilities, Fair Value	$ 1,128,030	$ 1,087,062