Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financial assets:
Cash and cash equivalents	$ 47,995	$ 42,832
Securities	728,020	847,961
Loans held for sale	5,856	5,037
Loans, net	2,076,158	1,980,846
Restricted investments in bank stock	11,775	15,223
Accrued interest receivable	7,188	7,349
Financial liabilities:
Deposits	2,448,381	2,383,085
Short-term borrowings	200,295	333,475
Long-term debt	24,932
Accrued interest payable	350	325
Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Financial assets:
Cash and cash equivalents	47,995	42,832
Securities	0	0
Loans held for sale	0	0
Loans, net	0	0
Restricted investments in bank stock	0	0
Accrued interest receivable	7,188	7,349
Financial liabilities:
Deposits	0	0
Short-term borrowings	200,295	333,475
Long-term debt	0
Accrued interest payable	350	325
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Significant Other Observable Inputs, Level 2 [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities	728,020	847,961
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
Accrued interest payable	0	0
Significant Other Observable Inputs, Level 2 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Significant Other Observable Inputs, Level 2 [Member] | Standby Letters of Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
Significant Unobservable Inputs, Level 3 [Member]
Financial assets:
Cash and cash equivalents	0	0
Securities	0	0
Loans held for sale	5,856	5,037
Loans, net	2,076,158	1,980,846
Restricted investments in bank stock	11,775	15,223
Accrued interest receivable	0	0
Financial liabilities:
Deposits	2,448,381	2,383,085
Short-term borrowings	0	0
Long-term debt	24,932
Accrued interest payable	0	0
Significant Unobservable Inputs, Level 3 [Member] | Commitments to Extend Credit [Member]
Financial liabilities:
Off-balance sheet instruments	0	0
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	47,995	42,832
Securities	726,988	853,032
Loans held for sale	5,380	4,996
Loans, net	2,070,962	1,973,536
Restricted investments in bank stock	11,775	15,223
Accrued interest receivable	7,188	7,349
Financial liabilities:
Deposits	2,445,487	2,380,672
Short-term borrowings	200,295	333,475
Long-term debt	25,000
Accrued interest payable	350	325
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