Securities (Details Textual) (USD $)	3 Months Ended
Mar. 31, 2013 Holdings	Mar. 31, 2012 Holdings	Dec. 31, 2012
Securities (Textual) [Abstract]
Maximum percentage of equity of one issuer	10.00%
Number of holdings greater than specified percentage of equity	0	0
Held-to-maturity, Amortized cost	$ 592,033,000		$ 602,509,000
Securities with aggregate par values	686,100,000		710,500,000
Proceed from sales - securities available-for-sale	3,371,000	3,076,000
Gross realized security gains	53,000	100,000
Gross security losses	37,000
Impaired loss relating to securities	0
Net unrealized security gains on the available-for-sale portfolio	12,300,000		13,000,000
Pittsburgh and Cincinnati [Member]
Investments in Debt and Marketable Equity Securities and Certain Trading Assets [Line Items]
Federal home loan bank stock, Total	$ 18,400,000		$ 21,300,000

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Impaired loss relating to securities.

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The maximum percentage of shareholders' equity of any one issuer other than the U.S. government and its agencies.

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Number of holdings greater than specified percentage of equity.

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