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Loans and Allowance for Loan Losses (Impaired Loans, Average Recorded Investment and Interest Income Recognized) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment $ 23,548 $ 29,238 $ 51,163
With no related allowance recorded, Interest Income Recognized 366 525 397
With an allowance recorded, Average Recorded Investment 4,911 7,832 7,844
With an allowance recorded, Interest Income Recognized 112 291 39
Average Recorded Investment 28,459 37,070 59,007
Interest Income Recognized 478 816 436
Commercial and agricultural [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment 429 0 784
With no related allowance recorded, Interest Income Recognized 0 0 8
With an allowance recorded, Average Recorded Investment 0 535 283
With an allowance recorded, Interest Income Recognized 0 20 5
Average Recorded Investment 429 535 1,067
Interest Income Recognized 0 20 13
Real estate - construction [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment 1,015 2,867 9,075
With no related allowance recorded, Interest Income Recognized 34 40 35
With an allowance recorded, Average Recorded Investment 0 0 638
With an allowance recorded, Interest Income Recognized 0 0 9
Average Recorded Investment 1,015 2,867 9,713
Interest Income Recognized 34 40 44
Real estate - mortgage, 1-4 family residential [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment 7,828 8,797 11,920
With no related allowance recorded, Interest Income Recognized 106 131 100
With an allowance recorded, Average Recorded Investment 3,953 3,148 2,713
With an allowance recorded, Interest Income Recognized 60 75 20
Average Recorded Investment 11,781 11,945 14,633
Interest Income Recognized 166 206 120
Real estate - mortgage, Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment 14,276 17,574 29,384
With no related allowance recorded, Interest Income Recognized 226 354 254
With an allowance recorded, Average Recorded Investment 958 4,149 4,127
With an allowance recorded, Interest Income Recognized 52 196 4
Average Recorded Investment 15,234 21,723 33,511
Interest Income Recognized 278 550 258
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
With no related allowance recorded, Average Recorded Investment 0 0 0
With no related allowance recorded, Interest Income Recognized 0 0 0
With an allowance recorded, Average Recorded Investment 0 0 83
With an allowance recorded, Interest Income Recognized 0 0 1
Average Recorded Investment 0 0 83
Interest Income Recognized $ 0 $ 0 $ 1