Acquired Credit Impaired Loans, Major Classifications of Acquired Credit Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	$ 754,548	$ 698,810
Less allowance for loan losses	2,879	3,121
Loans, net	751,857	695,835
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	47,958	35,424
Commercial Secured By Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	399,551	379,141
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	273,249	254,087
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	19,718	18,006
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	13,434	11,472
Other Loans, Including Deposit Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	638	680
Financing Receivable, Acquired Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	14,005	18,196
Less allowance for loan losses	0	303
Loans, net	14,005	17,893
Financing Receivable, Acquired Credit Impaired [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	1,881	1,092
Financing Receivable, Acquired Credit Impaired [Member] | Commercial Secured By Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	8,281	12,984
Financing Receivable, Acquired Credit Impaired [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	3,247	3,425
Financing Receivable, Acquired Credit Impaired [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	57	81
Financing Receivable, Acquired Credit Impaired [Member] | Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	39	101
Financing Receivable, Acquired Credit Impaired [Member] | Other Loans, Including Deposit Overdrafts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans gross	$ 500	$ 513