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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
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