Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Portion at Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	$ 77,728	$ 44,996
Securities	845,165	849,620
Loans held for sale	3,587	6,371
Loans, net	1,786,701	1,734,609
Restricted investments in bank stock	21,557	20,564
Accrued interest receivable	7,159	7,059
Financial liabilities:
Deposits	2,196,969	2,241,179
Short-term borrowings	380,189	277,750
Long-term debt	12,870	12,642
Accrued interest payable	523	218
Portion at Fair Value Measurement [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Portion at Fair Value Measurement [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Portion at Fair Value Measurement [Member] | Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Financial assets:
Cash and cash equivalents	77,728	44,996
Securities	0	0
Loans held for sale	0	0
Loans, net	0	0
Restricted investments in bank stock	0	0
Accrued interest receivable	7,159	7,059
Financial liabilities:
Deposits	0	0
Short-term borrowings	380,189	277,750
Long-term debt	0	0
Accrued interest payable	523	218
Portion at Fair Value Measurement [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
Portion at Fair Value Measurement [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
Portion at Fair Value Measurement [Member] | Significant Other Observable Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities	845,165	849,620
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
Portion at Fair Value Measurement [Member] | Significant Other Observable Inputs, Level 2 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Portion at Fair Value Measurement [Member] | Significant Other Observable Inputs, Level 2 [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Portion at Fair Value Measurement [Member] | Significant Unobservable Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities	0	0
Loans held for sale	3,587	6,371
Loans, net	1,786,701	1,734,609
Restricted investments in bank stock	21,557	20,564
Accrued interest receivable	0	0
Financial liabilities:
Deposits	2,196,969	2,241,179
Short-term borrowings	0	0
Long-term debt	12,870	12,642
Accrued interest payable	0	0
Portion at Fair Value Measurement [Member] | Significant Unobservable Inputs, Level 3 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Portion at Fair Value Measurement [Member] | Significant Unobservable Inputs, Level 3 [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	77,728	44,996
Securities	859,887	869,737
Loans held for sale	3,541	6,225
Loans, net	1,778,311	1,727,762
Restricted investments in bank stock	21,557	20,564
Accrued interest receivable	7,159	7,059
Financial liabilities:
Deposits	2,195,272	2,239,621
Short-term borrowings	380,189	277,750
Long-term debt	15,800	15,800
Accrued interest payable	523	218
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