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Loans and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Internal loan grading by class of loans |  |  |
Total loans | $ 3,219,967 | $ 3,242,427 | $ 3,049,376
Grade 1 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 2,773,325 |  | 2,645,309
Grade 2 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 375,201 |  | 318,990
Grade 3 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 51,969 |  | 64,538
Grade 4 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 19,468 |  | 20,539
Grade 5 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 4 |  |
Non-residential real estate [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 1,244,042 |  | 1,101,914
Non-residential real estate [Member] | Grade 1 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 1,043,069 |  | 951,016
Non-residential real estate [Member] | Grade 2 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 165,295 |  | 112,408
Non-residential real estate [Member] | Grade 3 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 25,994 |  | 28,721
Non-residential real estate [Member] | Grade 4 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 9,684 |  | 9,769
Non-residential real estate [Member] | Grade 5 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans |  |  |
Residential real estate [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 773,793 |  | 696,070
Residential real estate [Member] | Grade 1 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 670,352 |  | 591,818
Residential real estate [Member] | Grade 2 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 84,644 |  | 83,250
Residential real estate [Member] | Grade 3 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 14,140 |  | 15,579
Residential real estate [Member] | Grade 4 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 4,657 |  | 5,423
Residential real estate [Member] | Grade 5 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans |  |  |
Non-consumer non-real estate [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 750,601 |  | 725,088
Non-consumer non-real estate [Member] | Grade 1 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 647,162 |  | 636,582
Non-consumer non-real estate [Member] | Grade 2 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 97,110 |  | 79,548
Non-consumer non-real estate [Member] | Grade 3 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 4,800 |  | 7,480
Non-consumer non-real estate [Member] | Grade 4 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 1,529 |  | 1,478
Non-consumer non-real estate [Member] | Grade 5 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans |  |  |
Consumer non-real estate [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 211,320 |  | 200,208
Consumer non-real estate [Member] | Grade 1 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 198,107 |  | 187,999
Consumer non-real estate [Member] | Grade 2 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 10,912 |  | 9,690
Consumer non-real estate [Member] | Grade 3 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 1,923 |  | 2,132
Consumer non-real estate [Member] | Grade 4 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 374 |  | 387
Consumer non-real estate [Member] | Grade 5 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 4 |  |
Other loans [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 144,026 |  | 163,488
Other loans [Member] | Grade 1 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 139,696 |  | 158,729
Other loans [Member] | Grade 2 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 2,304 |  | 2,775
Other loans [Member] | Grade 3 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 1,103 |  | 1,725
Other loans [Member] | Grade 4 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 923 |  | 259
Other loans [Member] | Grade 5 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans |  |  |
Acquired loans [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 96,185 |  | 162,608
Acquired loans [Member] | Grade 1 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 74,939 |  | 119,165
Acquired loans [Member] | Grade 2 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 14,936 |  | 31,319
Acquired loans [Member] | Grade 3 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 4,009 |  | 8,901
Acquired loans [Member] | Grade 4 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans | 2,301 |  | 3,223
Acquired loans [Member] | Grade 5 [Member] |  |  |
Internal loan grading by class of loans |  |  |
Total loans |  |  |

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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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