Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	$ 59,382	$ 56,582
Securities	889,375	944,892
Loans held for sale	5,011	15,183
Loans, net	1,675,251	1,503,515
Restricted investments in bank stock	18,538	15,450
Accrued interest receivable	7,257	7,206
Financial liabilities:
Deposits	2,177,071	2,231,291
Short-term borrowings	316,225	113,225
Long-term debt	15,800	40,800
Accrued interest payable	217	308
Carrying Amount [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Carrying Amount [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member]
Financial assets:
Cash and cash equivalents	59,382	56,582
Securities	875,127	948,780
Loans held for sale	5,057	15,415
Loans, net	1,682,652	1,516,839
Restricted investments in bank stock	18,538	15,450
Accrued interest receivable	7,257	7,206
Financial liabilities:
Deposits	2,177,891	2,232,789
Short-term borrowings	316,225	113,225
Long-term debt	12,642	35,629
Accrued interest payable	217	308
Fair Value [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Financial assets:
Cash and cash equivalents	59,382	56,582
Securities	0	0
Loans held for sale	0	0
Loans, net	0	0
Restricted investments in bank stock	0	0
Accrued interest receivable	7,257	7,206
Financial liabilities:
Deposits	0	0
Short-term borrowings	316,225	113,225
Long-term debt	0	0
Accrued interest payable	217	308
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member] | Significant Other Observable Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities	875,127	948,780
Loans held for sale	0	0
Loans, net	0	0
Restricted investments in bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities:
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Fair Value [Member] | Significant Other Observable Inputs, Level 2 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member] | Significant Other Observable Inputs, Level 2 [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member] | Significant Unobservable Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities	0	0
Loans held for sale	5,057	15,415
Loans, net	1,682,652	1,516,839
Restricted investments in bank stock	18,538	15,450
Accrued interest receivable	0	0
Financial liabilities:
Deposits	2,177,891	2,232,789
Short-term borrowings	0	0
Long-term debt	12,642	35,629
Accrued interest payable	0	0
Fair Value [Member] | Significant Unobservable Inputs, Level 3 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Fair Value [Member] | Significant Unobservable Inputs, Level 3 [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	$ 0	$ 0