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Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Dec. 31, 2010
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Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Total ending allowance balance | $ 18,568 | $ 18,374 | $ 18,882 | $ 19,110 | $ 18,586 | $ 19,064
Total ending loans balance | 12,904 |  |  | 12,562 |  |
Allowance for Loan Losses [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Allowance For Loan Losses, Individually evaluated for impairment | 2,403 |  | 2,136 |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 16,165 |  | 16,746 |  |  |
Total ending allowance balance | 18,568 |  | 18,882 |  |  |
Loans [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Loans: Individually evaluated for impairment | 12,865 |  | 7,960 |  |  |
Loans: Collectively evaluated for impairment | 1,145,956 |  | 978,189 |  |  |
Total ending loans balance | 1,158,821 |  | 986,149 |  |  |
Commercial [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Allowance For Loan Losses, Individually evaluated for impairment | 2,403 |  | 2,136 |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 5,655 |  | 5,881 |  |  |
Total ending allowance balance | 8,058 |  | 8,017 |  |  |
Commercial [Member] | Loans [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Loans: Individually evaluated for impairment | 12,865 |  | 7,960 |  |  |
Loans: Collectively evaluated for impairment | 436,121 |  | 345,350 |  |  |
Total ending loans balance | 448,986 |  | 353,310 |  |  |
Real estate [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 2,974 |  | 2,472 |  |  |
Total ending allowance balance | 2,974 |  | 2,472 |  |  |
Real estate [Member] | Loans [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 177,218 |  | 157,663 |  |  |
Total ending loans balance | 177,218 |  | 157,663 |  |  |
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 1,716 |  | 1,695 |  |  |
Total ending allowance balance | 1,716 |  | 1,695 |  |  |
Mortgage Warehousing [Member] | Loans [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 244,660 |  | 208,726 |  |  |
Total ending loans balance | 244,660 |  | 208,726 |  |  |
Consumer [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 5,820 |  | 6,698 |  |  |
Total ending allowance balance | 5,820 |  | 6,698 |  |  |
Consumer [Member] | Loans [Member] |  |  |  |  |  |
Allowance for loan losses and the recorded investment in loans by portfolio segment |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 287,957 |  | 266,450 |  |  |
Total ending loans balance | $ 287,957 |  | $ 266,450 |  |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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