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Loans and Allowance for Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Impaired loans without a valuation allowance, Recorded Investment $ 9,799 $ 8,196
Impaired loans without a valuation allowance, Unpaid Principal Balance 11,695 8,390
Impaired loans without a valuation allowance, Average Recorded Investment 9,044 11,273
Impaired loans without a valuation allowance, Interest Income Recognized 192 575
Impaired loans with a valuation allowance, Recorded Investment 8,416 17,221
Impaired loans with a valuation allowance, Unpaid Principal Balance 9,865 17,338
Impaired loans with a valuation allowance, Related Allowance 3,170 4,976
Impaired loans with a valuation allowance, Average Recorded Investment 12,642 12,323
Impaired loans with a valuation allowance, Interest Income Recognized 123 1,066
Total impaired loans, Recorded Investment 18,215 25,417
Total impaired loans, Unpaid Principal Balance 21,560 25,728
Total impaired loans,Related Allowance 3,170 4,976
Total impaired loans, Average Recorded Investment 21,686 23,596
Total impaired loans, Interest Income Recognized 315 1,641
Commercial Real Estate Mortgage [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 5,565 4,354
Impaired loans without a valuation allowance, Unpaid Principal Balance 5,595 4,354
Impaired loans without a valuation allowance, Average Recorded Investment 4,627 5,378
Impaired loans without a valuation allowance, Interest Income Recognized 103 330
Impaired loans with a valuation allowance, Recorded Investment 6,196 9,639
Impaired loans with a valuation allowance, Unpaid Principal Balance 7,645 9,694
Impaired loans with a valuation allowance, Related Allowance 2,193 2,605
Impaired loans with a valuation allowance, Average Recorded Investment 7,574 5,912
Impaired loans with a valuation allowance, Interest Income Recognized 75 645
Consumer Real Estate Mortgage [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 1,764 322
Impaired loans without a valuation allowance, Unpaid Principal Balance 3,596 322
Impaired loans without a valuation allowance, Average Recorded Investment 1,490 3,589
Impaired loans without a valuation allowance, Interest Income Recognized 66 21
Impaired loans with a valuation allowance, Recorded Investment 753 6,195
Impaired loans with a valuation allowance, Unpaid Principal Balance 753 6,257
Impaired loans with a valuation allowance, Related Allowance 324 1,254
Impaired loans with a valuation allowance, Average Recorded Investment 3,817 5,333
Impaired loans with a valuation allowance, Interest Income Recognized 8 294
Construction and Land Development [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 246 829
Impaired loans without a valuation allowance, Unpaid Principal Balance 253 1,023
Impaired loans without a valuation allowance, Average Recorded Investment 505 1,099
Impaired loans without a valuation allowance, Interest Income Recognized 4 59
Impaired loans with a valuation allowance, Recorded Investment 706 879
Impaired loans with a valuation allowance, Unpaid Principal Balance 706 879
Impaired loans with a valuation allowance, Related Allowance 446 653
Impaired loans with a valuation allowance, Average Recorded Investment 686 294
Impaired loans with a valuation allowance, Interest Income Recognized 13 62
Commercial and Industrial Loans [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 2,224 2,691
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,251 2,691
Impaired loans without a valuation allowance, Average Recorded Investment 2,422 1,207
Impaired loans without a valuation allowance, Interest Income Recognized 19 165
Impaired loans with a valuation allowance, Recorded Investment 761 508
Impaired loans with a valuation allowance, Unpaid Principal Balance 761 508
Impaired loans with a valuation allowance, Related Allowance 207 464
Impaired loans with a valuation allowance, Average Recorded Investment 565 784
Impaired loans with a valuation allowance, Interest Income Recognized $ 27 $ 65