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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 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | $ 18,827 |  | $ 13,194
90 Days and Greater | 9,280 |  | 7,153
Total Past Due Loans | 28,107 |  | 20,347
Current Loans | 3,637,801 |  | 3,224,737
Total Loans | 3,665,908 | 3,387,146 | 3,245,084
Accruing Loans 90 Days or More Past Due | 1,789 | 1,179 | 850
Non-residential real estate owner occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 477 |  | 1,848
90 Days and Greater | 264 |  | 138
Total Past Due Loans | 741 |  | 1,986
Current Loans | 482,081 |  | 444,231
Total Loans | 482,822 |  | 446,217
Accruing Loans 90 Days or More Past Due | 60 |  | 120
Non-residential real estate other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 5,065 |  | 230
90 Days and Greater | 825 |  | 3,056
Total Past Due Loans | 5,890 |  | 3,286
Current Loans | 920,264 |  | 801,821
Total Loans | 926,154 |  | 805,107
Accruing Loans 90 Days or More Past Due | 0 |  | 51
Residential real estate permanent mortgage [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 2,224 |  | 1,496
90 Days and Greater | 656 |  | 566
Total Past Due Loans | 2,880 |  | 2,062
Current Loans | 282,749 |  | 249,671
Total Loans | 285,629 |  | 251,733
Accruing Loans 90 Days or More Past Due | 180 |  | 102
Residential real estate all other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 1,545 |  | 1,494
90 Days and Greater | 892 |  | 251
Total Past Due Loans | 2,437 |  | 1,745
Current Loans | 598,454 |  | 539,276
Total Loans | 600,891 |  | 541,021
Accruing Loans 90 Days or More Past Due | 538 |  | 49
Non-consumer non-real estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 2,059 |  | 3,519
90 Days and Greater | 985 |  | 816
Total Past Due Loans | 3,044 |  | 4,335
Current Loans | 859,012 |  | 745,327
Total Loans | 862,056 |  | 749,662
Accruing Loans 90 Days or More Past Due | 46 |  | 32
Consumer non-real estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 2,256 |  | 2,382
90 Days and Greater | 313 |  | 213
Total Past Due Loans | 2,569 |  | 2,595
Current Loans | 230,774 |  | 214,785
Total Loans | 233,343 |  | 217,380
Accruing Loans 90 Days or More Past Due | 219 |  | 176
Other loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 1,695 |  | 1,850
90 Days and Greater | 356 |  | 1,520
Total Past Due Loans | 2,051 |  | 3,370
Current Loans | 146,218 |  | 144,135
Total Loans | 148,269 |  | 147,505
Accruing Loans 90 Days or More Past Due | 0 |  | 0
Acquired loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
30-89 Days Past Due | 3,506 |  | 375
90 Days and Greater | 4,989 |  | 593
Total Past Due Loans | 8,495 |  | 968
Current Loans | 118,249 |  | 85,491
Total Loans | 126,744 |  | 86,459
Accruing Loans 90 Days or More Past Due | $ 746 |  | $ 320

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