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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | $ 19,038 | $ 16,153
90 Days and Greater | 7,196 | 5,820
Total Past Due Loans | 26,234 | 21,973
Current Loans | 3,360,912 | 3,220,454
Total Loans | 3,387,146 | 3,242,427
Accruing Loans 90 Days or More Past Due | 1,179 | 537
Non-residential real estate owner occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 411 | 911
90 Days and Greater | 316 | 207
Total Past Due Loans | 727 | 1,118
Current Loans | 454,305 | 479,536
Total Loans | 455,032 | 480,654
Accruing Loans 90 Days or More Past Due | 96 | 64
Non-residential real estate other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 5,660 | 3,453
90 Days and Greater | 1,543 | 2,124
Total Past Due Loans | 7,203 | 5,577
Current Loans | 856,179 | 736,014
Total Loans | 863,382 | 741,591
Accruing Loans 90 Days or More Past Due | 2 |
Residential real estate primary mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 2,566 | 2,488
90 Days and Greater | 789 | 560
Total Past Due Loans | 3,355 | 3,048
Current Loans | 262,625 | 245,849
Total Loans | 265,980 | 248,897
Accruing Loans 90 Days or More Past Due | 275 | 131
Residential real estate all other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 2,370 | 2,176
90 Days and Greater | 1,272 | 653
Total Past Due Loans | 3,642 | 2,829
Current Loans | 564,231 | 503,207
Total Loans | 567,873 | 506,036
Accruing Loans 90 Days or More Past Due | 184 | 116
Non-consumer non-real estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 1,240 | 1,672
90 Days and Greater | 1,047 | 298
Total Past Due Loans | 2,287 | 1,970
Current Loans | 793,028 | 783,153
Total Loans | 795,315 | 785,123
Accruing Loans 90 Days or More Past Due | 125 | 28
Consumer non-real estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 2,428 | 2,624
90 Days and Greater | 392 | 179
Total Past Due Loans | 2,820 | 2,803
Current Loans | 225,515 | 218,944
Total Loans | 228,335 | 221,747
Accruing Loans 90 Days or More Past Due | 279 | 136
Other loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 2,562 | 1,348
90 Days and Greater | 1,244 | 1,266
Total Past Due Loans | 3,806 | 2,614
Current Loans | 141,550 | 147,283
Total Loans | 145,356 | 149,897
Acquired loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
30-89 Days Past Due | 1,801 | 1,481
90 Days and Greater | 593 | 533
Total Past Due Loans | 2,394 | 2,014
Current Loans | 63,479 | 106,468
Total Loans | 65,873 | 108,482
Accruing Loans 90 Days or More Past Due | $ 218 | $ 62

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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=28368275&loc=d3e5111-111524 + Details
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