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Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Impaired loans segregated by class of loans |  |
Unpaid Principal Balance | $ 52,140 | $ 27,101
Recorded Investment with Allowance | 47,482 | 24,088
Related Allowance | 4,276 | 3,345
Average Recorded Investment | 47,601 | 24,591
Non-residential real estate [Member] |  |
Impaired loans segregated by class of loans |  |
Unpaid Principal Balance | 27,593 | 9,285
Recorded Investment with Allowance | 26,434 | 8,671
Related Allowance | 1,813 | 978
Average Recorded Investment | 26,733 | 9,835
Residential real estate [Member] |  |
Impaired loans segregated by class of loans |  |
Unpaid Principal Balance | 5,664 | 6,520
Recorded Investment with Allowance | 5,136 | 5,871
Related Allowance | 1,374 | 1,520
Average Recorded Investment | 5,333 | 6,351
Non-consumer non-real estate [Member] |  |
Impaired loans segregated by class of loans |  |
Unpaid Principal Balance | 3,144 | 1,584
Recorded Investment with Allowance | 2,539 | 1,286
Related Allowance | 677 | 358
Average Recorded Investment | 1,745 | 1,676
Consumer non-real estate [Member] |  |
Impaired loans segregated by class of loans |  |
Unpaid Principal Balance | 447 | 215
Recorded Investment with Allowance | 424 | 180
Related Allowance | 77 | 47
Average Recorded Investment | 364 | 204
Other loans [Member] |  |
Impaired loans segregated by class of loans |  |
Unpaid Principal Balance | 2,420 | 3,888
Recorded Investment with Allowance | 2,265 | 3,794
Related Allowance | 264 | 342
Average Recorded Investment | 1,975 | 4,296
Acquired loans [Member] |  |
Impaired loans segregated by class of loans |  |
Unpaid Principal Balance | 12,872 | 5,609
Recorded Investment with Allowance | 10,684 | 4,286
Related Allowance | 71 | 100
Average Recorded Investment | $ 11,451 | $ 2,229

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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