Fair Value Measurements and Fair Value of Financial Instruments (Schedule of Placement of Carrying Amount and Fair Value in Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from banks, Fair Value	$ 33,557	$ 104,134
Cash and due from banks, Carrying Amount	33,557	104,134
Interest bearing deposits with banks, Carrying Amount	0	2,004
Interest bearing deposits with banks, Fair Value		2,004
Investment securities available-for-sale, Carrying Amount	413,147	496,815
Investment securities: Available-for-sale	413,147	496,815
Investment securities held-to-maturity, Carrying Amount	153,486	58,064
Investment securities held-to-maturity, Fair Value	152,008	62,431
Restricted investment in bank stocks, Carrying Amount	8,986	8,964
Restricted investment in bank stocks, Fair Value	8,986	8,964
Loans held for sale, Carrying Amount	101	1,491
Loans held for sale, Fair Value	101	1,491
Net loans, Carrying Amount	947,298	879,435
Net Loans, Fair Value	950,226	897,030
Accrued interest receivable, Carrying Amount	6,570	6,849
Accrued interest receivable, Fair Value	6,570	6,849
Non interest-bearing deposits, Carrying Amount	238,214	215,071
Non interest-bearing deposits, Fair Value	238,214	215,071
Interest-bearing deposits, Carrying Amount	1,076,103	1,091,851
Interest-bearing deposits, Fair Value	1,076,997	1,092,822
Long-term borrowings, Carrying Amount	146,000	146,000
Long-term borrowings, Fair Value	158,093	162,992
Subordinated debentures, Carrying Amount	5,155	5,155
Subordinated debentures, Fair Value	5,145	5,046
Accrued interest payable, Carrying Amount	821	874
Accrued interest payable, Fair Value	821	874
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from banks, Fair Value	33,557	104,134
Interest bearing deposits with banks, Fair Value		2,004
Investment securities: Available-for-sale	48,369	21,901
Investment securities held-to-maturity, Fair Value	0	0
Restricted investment in bank stocks, Fair Value	0	0
Loans held for sale, Fair Value	101	1,491
Net Loans, Fair Value	0	0
Accrued interest receivable, Fair Value	0	0
Non interest-bearing deposits, Fair Value	0	0
Interest-bearing deposits, Fair Value	0	0
Long-term borrowings, Fair Value	0	0
Subordinated debentures, Fair Value	0	0
Accrued interest payable, Fair Value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from banks, Fair Value	0	0
Interest bearing deposits with banks, Fair Value		0
Investment securities: Available-for-sale	364,684	474,878
Investment securities held-to-maturity, Fair Value	152,008	62,431
Restricted investment in bank stocks, Fair Value	8,986	8,964
Loans held for sale, Fair Value	0	0
Net Loans, Fair Value	0	0
Accrued interest receivable, Fair Value	4,122	4,465
Non interest-bearing deposits, Fair Value	238,214	215,071
Interest-bearing deposits, Fair Value	1,076,997	1,092,822
Long-term borrowings, Fair Value	158,093	162,992
Subordinated debentures, Fair Value	5,145	5,046
Accrued interest payable, Fair Value	821	874
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from banks, Fair Value	0	0
Interest bearing deposits with banks, Fair Value		0
Investment securities: Available-for-sale	94	36
Investment securities held-to-maturity, Fair Value	0	0
Restricted investment in bank stocks, Fair Value	0	0
Loans held for sale, Fair Value	0	0
Net Loans, Fair Value	950,226	897,030
Accrued interest receivable, Fair Value	2,448	2,384
Non interest-bearing deposits, Fair Value	0	0
Interest-bearing deposits, Fair Value	0	0
Long-term borrowings, Fair Value	0	0
Subordinated debentures, Fair Value	0	0
Accrued interest payable, Fair Value	$ 0	$ 0