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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, 2013
Dec. 31, 2012
Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due $ 13,194   $ 14,523
90 Days and Greater 7,153   7,175
Total Past Due Loans 20,347   21,698
Current Loans 3,224,737   3,043,741
Total Loans 3,245,084 3,242,427 3,065,439
Accruing Loans 90 Days or More Past Due 850 537 1,403
Non-residential real estate [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 2,078   2,649
90 Days and Greater 3,194   2,454
Total Past Due Loans 5,272   5,103
Current Loans 1,246,052   1,135,948
Total Loans 1,251,324   1,141,051
Accruing Loans 90 Days or More Past Due 171   285
Residential real estate [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 2,990   4,240
90 Days and Greater 817   1,288
Total Past Due Loans 3,807   5,528
Current Loans 788,947   715,621
Total Loans 792,754   721,149
Accruing Loans 90 Days or More Past Due 151   478
Non-consumer non-real estate [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 3,519   1,285
90 Days and Greater 816   244
Total Past Due Loans 4,335   1,529
Current Loans 745,327   695,887
Total Loans 749,662   697,416
Accruing Loans 90 Days or More Past Due 32   16
Consumer non-real estate [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 2,382   2,002
90 Days and Greater 213   183
Total Past Due Loans 2,595   2,185
Current Loans 214,785   198,242
Total Loans 217,380   200,427
Accruing Loans 90 Days or More Past Due 176   122
Other loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 1,850   1,213
90 Days and Greater 1,520   1,654
Total Past Due Loans 3,370   2,867
Current Loans 144,135   153,117
Total Loans 147,505   155,984
Accruing Loans 90 Days or More Past Due     102
Acquired loans [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 375   3,134
90 Days and Greater 593   1,352
Total Past Due Loans 968   4,486
Current Loans 85,491   144,926
Total Loans 86,459   149,412
Accruing Loans 90 Days or More Past Due $ 320   $ 400