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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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due $ 18,670   $ 15,970
90 Days and Greater 8,368   4,945
Total Past Due Loans 27,038   20,915
Current Loans 3,515,232   3,199,052
Total Loans 3,542,270 3,387,146 3,219,967
Accruing Loans 90 Days or More Past Due 910 1,179 542
Non-residential real estate owner occupied [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 518   1,230
90 Days and Greater 298   112
Total Past Due Loans 816   1,342
Current Loans 457,978   452,461
Total Loans 458,794   453,803
Accruing Loans 90 Days or More Past Due 96   18
Non-residential real estate other [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 4,978   2,063
90 Days and Greater 935   1,833
Total Past Due Loans 5,913   3,896
Current Loans 873,592   786,343
Total Loans 879,505   790,239
Accruing Loans 90 Days or More Past Due        
Residential real estate permanent mortgage [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 1,867   2,351
90 Days and Greater 458   460
Total Past Due Loans 2,325   2,811
Current Loans 270,879   245,945
Total Loans 273,204   248,756
Accruing Loans 90 Days or More Past Due 76   163
Residential real estate all other [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 1,274   2,087
90 Days and Greater 543   408
Total Past Due Loans 1,817   2,495
Current Loans 565,930   522,542
Total Loans 567,747   525,037
Accruing Loans 90 Days or More Past Due 86   105
Non-consumer non-real estate [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 2,749   2,100
90 Days and Greater 929   214
Total Past Due Loans 3,678   2,314
Current Loans 824,361   748,287
Total Loans 828,039   750,601
Accruing Loans 90 Days or More Past Due 18   74
Consumer non-real estate [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 2,151   1,994
90 Days and Greater 260   184
Total Past Due Loans 2,411   2,178
Current Loans 223,551   209,142
Total Loans 225,962   211,320
Accruing Loans 90 Days or More Past Due 218   126
Other loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 2,080   2,152
90 Days and Greater 337   1,406
Total Past Due Loans 2,417   3,558
Current Loans 145,794   140,468
Total Loans 148,211   144,026
Accruing Loans 90 Days or More Past Due        
Acquired loans [Member]
     
Financing Receivable, Recorded Investment, Past Due [Line Items]      
30-89 Days Past Due 3,053   1,993
90 Days and Greater 4,608   328
Total Past Due Loans 7,661   2,321
Current Loans 153,147   93,864
Total Loans 160,808   96,185
Accruing Loans 90 Days or More Past Due $ 416   $ 56