Fair Value of Financial Instruments (Fair Values of Financial Assets and Liabilities on Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Carrying Amount
Financial assets:
Cash and cash equivalents	$ 125,398	$ 62,542
Investment securities	675,836	709,085
Loans	965,923	973,907
Financial liabilities:
Deposits	1,528,926	1,492,303
Short-term borrowings	32,395	47,769
Long-term borrowings	127,074	128,823
Fair Value
Financial assets:
Cash and cash equivalents	125,398	62,542
Investment securities	676,096	710,934
Loans	897,408	897,132
Financial liabilities:
Deposits	1,538,430	1,503,098
Short-term borrowings	32,395	47,769
Long-term borrowings	$ 138,688	$ 141,691

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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