Investment Securities (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Investments [Line Items]
Gain on sale of investment securities	$ 0	$ 0	$ 703,000	$ 774,000
Sale proceeds from sale of securities	7,946,000		7,946,000	22,590,000
Income tax provision on gross gain on sale of securities	253,000			271,000
Additional credit-related impairment loss on securities for which an other-than-temporary impairment was previously recognized	0		0	31,000
Municipal Securities [Member]
Schedule of Investments [Line Items]
Market value of securities in the Pennsylvania geographical area with the highest concentration of municipal securities	$ 1,300,000		$ 1,300,000
Number of securities in investment portfolio number	13		13
Securities in unrealized loss positions, number of positions	3		3
Number of securities in the geographical area with the highest concentration of municipal securities	1		1
Number of municipal securities with OTTI impairment	0		0
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Number of securities in investment portfolio number	23		23
Securities in unrealized loss positions, number of positions	16		16
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Number of securities in investment portfolio number	41		41
Securities in unrealized loss positions, number of positions	1		1