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Loans and Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
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Age analysis of past due loans segregated by class of loans |  |  |
30-89 Days Past Due | $ 15,970 |  | $ 14,341
90 Days and Greater | 4,945 |  | 5,903
Total Past Due Loans | 20,915 |  | 20,244
Current Loans | 3,199,052 |  | 3,029,132
Total Loans | 3,219,967 | 3,242,427 | 3,049,376
Accruing Loans 90 Days or More Past Due | 542 | 537 | 1,150
Non-residential real estate [Member] |  |  |
Age analysis of past due loans segregated by class of loans |  |  |
30-89 Days Past Due | 3,293 |  | 3,924
90 Days and Greater | 1,945 |  | 849
Total Past Due Loans | 5,238 |  | 4,773
Current Loans | 1,238,804 |  | 1,097,141
Total Loans | 1,244,042 |  | 1,101,914
Accruing Loans 90 Days or More Past Due | 18 |  | 192
Residential real estate [Member] |  |  |
Age analysis of past due loans segregated by class of loans |  |  |
30-89 Days Past Due | 4,438 |  | 3,218
90 Days and Greater | 868 |  | 1,915
Total Past Due Loans | 5,306 |  | 5,133
Current Loans | 768,487 |  | 690,937
Total Loans | 773,793 |  | 696,070
Accruing Loans 90 Days or More Past Due | 268 |  | 436
Non-consumer non-real estate [Member] |  |  |
Age analysis of past due loans segregated by class of loans |  |  |
30-89 Days Past Due | 2,100 |  | 1,311
90 Days and Greater | 214 |  | 633
Total Past Due Loans | 2,314 |  | 1,944
Current Loans | 748,287 |  | 723,144
Total Loans | 750,601 |  | 725,088
Accruing Loans 90 Days or More Past Due | 74 |  | 132
Consumer non-real estate [Member] |  |  |
Age analysis of past due loans segregated by class of loans |  |  |
30-89 Days Past Due | 1,994 |  | 1,767
90 Days and Greater | 184 |  | 220
Total Past Due Loans | 2,178 |  | 1,987
Current Loans | 209,142 |  | 198,221
Total Loans | 211,320 |  | 200,208
Accruing Loans 90 Days or More Past Due | 126 |  | 195
Other loans [Member] |  |  |
Age analysis of past due loans segregated by class of loans |  |  |
30-89 Days Past Due | 2,152 |  | 1,414
90 Days and Greater | 1,406 |  | 1,352
Total Past Due Loans | 3,558 |  | 2,766
Current Loans | 140,468 |  | 160,722
Total Loans | 144,026 |  | 163,488
Accruing Loans 90 Days or More Past Due |  |  | 59
Acquired loans [Member] |  |  |
Age analysis of past due loans segregated by class of loans |  |  |
30-89 Days Past Due | 1,993 |  | 2,707
90 Days and Greater | 328 |  | 934
Total Past Due Loans | 2,321 |  | 3,641
Current Loans | 93,864 |  | 158,967
Total Loans | 96,185 |  | 162,608
Accruing Loans 90 Days or More Past Due | $ 56 |  | $ 136

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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. + Details
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