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Allowance for Loan Losses Allowance for Loan Losses Narrative (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 loan | Mar. 31, 2012 loan | Dec. 31, 2012 loan | Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less allowance for loan losses | $ 12,720 | $ 12,954 | $ 12,500 | $ 13,000
Adverse variance | 20.00% |  |  |
Loan value, lower range | 75.00% |  |  |
Construction loans accrual to company capital | 17.00% |  |  |
Contstructions loan portfolio maximum to company captial | 100.00% |  |  |
Construction and non owner occupied commercial real estate | 73.90% |  |  |
Construction and non owner occupied commercial real estae maximum | 300.00% |  |  |
Outstanding loans and commitments subject by independent consulting firm | 50.00% |  |  |
Residential loans typical loan to value range, high | 80.00% |  |  |
Collateralized consumer loans to individuals loan to value maximum, lower range | 80.00% |  |  |
Collateralized consumer loans to individuals loan to value maximum, higher range | 90.00% |  |  |
Number of Loans | 106 | 71 | 101 |
Balance | 31,147 | 20,647 | 29,955 |
Number of contracts greater than 30 days past due | 11 | 11 |  |
Recorded investment greater than 30 days past due | 2,503 | 2,258 |  |
Number of loans classified as TDR in previous 12 months | 2 | 7 |  |
Loans classified as TDR in last 12 months | 409 | 1,733 |  |
Number of Loans | 7 | 14 |  |
Pre-Modification Outstanding Recorded Investment | 2,948 | 3,007 |  |
Number of TDR loans that are involved in bankruptcy | 13 |  |  |
Loans classified as TDR that are involved in bankruptcy | 1,222 |  |  |
Number of loans classified as TDR that were on non accrual status | 28 |  |  |
Financing Receivalbe, Number of Loans Classified As Troubled Debt Restructurings Classifed As NonAccrual | 4,695 |  |  |
Number of loans classified as TDR involved in foreclosure | 4 |  |  |
Loans classified as TDR that are involved in Foreclosure | 504 |  |  |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Deliquent period before residential loans placed on non accrual status | 120 days |  |  |
Residential Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less allowance for loan losses | 9 | 59 | 11 | 255
Deliquent period before residential loans placed on non accrual status | 90 days |  |  |
Unallocated Financing Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less allowance for loan losses | 1,089 | 1,699 | 842 | 2,008
Number of days past due | 30 days | 30 days |  |
Unallocated Reserves [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less allowance for loan losses | 1,089 | 1,699 | 842 |
Unallocated Reserves [Member] | Unallocated Financing Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Less allowance for loan losses | $ 1,089 | $ 1,699 | $ 842 |

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