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Loans and Allowance for Loan Losses (Details 5) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Impaired loans without a valuation allowance, Recorded Investment $ 7,179 $ 8,196
Impaired loans without a valuation allowance, Unpaid Principal Balance 7,895 8,390
Impaired loans without a valuation allowance, Average Recorded Investment 8,792 11,273
Impaired loans without a valuation allowance, Interest Income Recognized 210 575
Impaired loans with a valuation allowance, Recorded Investment 12,563 17,221
Impaired loans with a valuation allowance, Unpaid Principal Balance 12,676 17,338
Impaired loans with a valuation allowance, Related Allowance 3,357 4,976
Impaired loans with a valuation allowance, Average Recorded Investment 14,051 12,323
Impaired loans with a valuation allowance, Interest Income Recognized 399 1,066
Total impaired loans, Recorded Investment 19,742 25,417
Total impaired loans, Unpaid Principal Balance 20,571 25,728
Total impaired loans, Average Recorded Investment 22,843 23,596
Total impaired loans, Interest Income Recognized 609 1,641
Commercial Real Estate Mortgage [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 2,675 4,354
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,692 4,354
Impaired loans without a valuation allowance, Average Recorded Investment 4,314 5,378
Impaired loans without a valuation allowance, Interest Income Recognized 98 330
Impaired loans with a valuation allowance, Recorded Investment 7,758 9,639
Impaired loans with a valuation allowance, Unpaid Principal Balance 7,770 9,694
Impaired loans with a valuation allowance, Related Allowance 1,932 2,605
Impaired loans with a valuation allowance, Average Recorded Investment 8,034 5,912
Impaired loans with a valuation allowance, Interest Income Recognized 246 645
Consumer Real Estate Mortgage [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 1,918 322
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,601 322
Impaired loans without a valuation allowance, Average Recorded Investment 1,399 3,589
Impaired loans without a valuation allowance, Interest Income Recognized 96 21
Impaired loans with a valuation allowance, Recorded Investment 3,601 6,195
Impaired loans with a valuation allowance, Unpaid Principal Balance 3,702 6,257
Impaired loans with a valuation allowance, Related Allowance 781 1,254
Impaired loans with a valuation allowance, Average Recorded Investment 4,838 5,333
Impaired loans with a valuation allowance, Interest Income Recognized 98 294
Construction and Land Development [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 244 829
Impaired loans without a valuation allowance, Unpaid Principal Balance 251 1,023
Impaired loans without a valuation allowance, Average Recorded Investment 591 1,099
Impaired loans without a valuation allowance, Interest Income Recognized 9 59
Impaired loans with a valuation allowance, Recorded Investment 719 879
Impaired loans with a valuation allowance, Unpaid Principal Balance 719 879
Impaired loans with a valuation allowance, Related Allowance 459 653
Impaired loans with a valuation allowance, Average Recorded Investment 679 294
Impaired loans with a valuation allowance, Interest Income Recognized 25 62
Commercial and Industrial Loans [Member]
    
Impaired loans without a valuation allowance, Recorded Investment 2,342 2,691
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,351 2,691
Impaired loans without a valuation allowance, Average Recorded Investment 2,488 1,207
Impaired loans without a valuation allowance, Interest Income Recognized 7 165
Impaired loans with a valuation allowance, Recorded Investment 485 508
Impaired loans with a valuation allowance, Unpaid Principal Balance 485 508
Impaired loans with a valuation allowance, Related Allowance 185 464
Impaired loans with a valuation allowance, Average Recorded Investment 500 784
Impaired loans with a valuation allowance, Interest Income Recognized $ 30 $ 65