Fair Value (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Securities	$ 630,881	$ 587,602
Loans Held-for-Sale	25,280	16,641
Derivatives	115	187
Financial Liabilities Derivatives	103	178
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agency Securities [Member]
Assets:
Securities	23,164	23,472
Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Assets:
Securities	76,118	76,485
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities - Residential [Member]
Assets:
Securities	530,827	486,912
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Securities	772	733
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Securities	419	380
Loans Held-for-Sale	0	0
Derivatives	0	0
Financial Liabilities Derivatives	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury and Agency Securities [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Securities [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of State and Political Subdivisions [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-backed Securities - Residential [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member]
Assets:
Securities	419	380
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Securities	618,381	574,700
Loans Held-for-Sale	25,280	16,641
Derivatives	115	187
Financial Liabilities Derivatives	103	178
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and Agency Securities [Member]
Assets:
Securities	23,164	23,472
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Obligations of State and Political Subdivisions [Member]
Assets:
Securities	64,390	64,316
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed Securities - Residential [Member]
Assets:
Securities	530,827	486,912
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Securities	12,081	12,522
Loans Held-for-Sale	0	0
Derivatives	0	0
Financial Liabilities Derivatives	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and Agency Securities [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Obligations of State and Political Subdivisions [Member]
Assets:
Securities	11,728	12,169
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-backed Securities - Residential [Member]
Assets:
Securities	0	0
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
Assets:
Securities	$ 353	$ 353