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Fair Value (Additional Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Loan held for sale, at fair value $ 9,844   $ 9,265
Contractual principal balance of Loan held for sale 9,676   9,129
Difference in amount of loan held for sale 168   136
Impaired loans, carrying amount 8,124   4,449
Valuation allowance for loans losses 4,002   3,103
Provision for loan losses 863   1,024
Provision for loan lease and other losses   50  
Other real estate, carrying value     20
Cost of real estate sales   207  
Obligations of State and Political Subdivisions [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total Gains or Losses (realized/unrealized) Included in Earnings 69 (21)  
Equity Securities [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total Gains or Losses (realized/unrealized) Included in Earnings 0 0  
Fair Value, Measurements, Recurring [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 613,170   606,032
Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 116,556   113,497
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 353   353
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 10,829   11,185
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Obligations of State and Political Subdivisions [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities 10,476   10,832
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
     
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Securities $ 353   $ 353