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Loans and Allowance for Loan Losses - Summary of Impaired Loans, by Class (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Financial Receivables Impaired Or Restructured [Line Items]    
Recorded Investment $ 14,424  
Specific Related Allowance 2,906  
Commercial Real Estate [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With allowance recorded, Recorded Investment 14,300 12,623
With allowance recorded, Unpaid Principal Balance 23,748 21,877
With allowance recorded, Specific Related Allowance 2,782 2,136
With allowance recorded, Average Recorded Investment 14,379 14,522
With no allowance recorded, Recorded Investment 34,281 37,119
With no allowance recorded, Unpaid Principal Balance 46,548 50,234
With no allowance recorded, Specific Related Allowance     
With no allowance recorded, Average Recorded Investment 34,165 36,426
Recorded Investment 48,581 49,742
Unpaid Principal Balance 70,296 72,111
Specific Related Allowance 2,782 2,136
Average Recorded Investment 48,544 50,948
Commercial and Industrial [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With allowance recorded, Recorded Investment 124 590
With allowance recorded, Unpaid Principal Balance 131 590
With allowance recorded, Specific Related Allowance 124 590
With allowance recorded, Average Recorded Investment 126 592
With no allowance recorded, Recorded Investment 9,308 7,074
With no allowance recorded, Unpaid Principal Balance 11,377 9,597
With no allowance recorded, Average Recorded Investment 9,448 6,992
Recorded Investment 9,432 7,664
Unpaid Principal Balance 11,508 10,187
Specific Related Allowance 124 590
Average Recorded Investment 9,574 7,584
Commercial Leases [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With no allowance recorded, Recorded Investment 782 965
With no allowance recorded, Unpaid Principal Balance 782  
With no allowance recorded, Average Recorded Investment 729 1,053
Recorded Investment 782 965
Unpaid Principal Balance 782  
Average Recorded Investment 729 1,053
Commercial Loans [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With allowance recorded, Recorded Investment 14,424 13,213
With allowance recorded, Unpaid Principal Balance 23,879 22,467
With allowance recorded, Specific Related Allowance 2,906 2,726
With allowance recorded, Average Recorded Investment 14,505 15,114
With no allowance recorded, Recorded Investment 44,371 45,158
With no allowance recorded, Unpaid Principal Balance 58,707 59,831
With no allowance recorded, Average Recorded Investment 44,342 44,471
Recorded Investment 58,795 58,371
Unpaid Principal Balance 82,586 82,298
Specific Related Allowance 2,906 2,726
Average Recorded Investment 58,847 59,585
Direct Installment [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With no allowance recorded, Recorded Investment 10,665 8,541
With no allowance recorded, Unpaid Principal Balance 10,901 8,693
With no allowance recorded, Average Recorded Investment 10,451 6,443
Recorded Investment 10,665 8,541
Unpaid Principal Balance 10,901 8,693
Average Recorded Investment 10,451 6,443
Residential Mortgages [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With no allowance recorded, Recorded Investment 13,298 11,414
With no allowance recorded, Unpaid Principal Balance 13,561 11,223
With no allowance recorded, Average Recorded Investment 13,767 9,059
Recorded Investment 13,298 11,414
Unpaid Principal Balance 13,561 11,223
Average Recorded Investment 13,767 9,059
Indirect Installment [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With no allowance recorded, Recorded Investment 1,092 1,132
With no allowance recorded, Unpaid Principal Balance 2,491 2,381
With no allowance recorded, Average Recorded Investment 1,169 1,133
Recorded Investment 1,092 1,132
Unpaid Principal Balance 2,491 2,381
Average Recorded Investment 1,169 1,133
Consumer Lines of Credit [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With no allowance recorded, Recorded Investment 549 746
With no allowance recorded, Unpaid Principal Balance 609 792
With no allowance recorded, Average Recorded Investment 631 591
Recorded Investment 549 746
Unpaid Principal Balance 609 792
Average Recorded Investment 631 591
Other [Member]
   
Financial Receivables Impaired Or Restructured [Line Items]    
With no allowance recorded, Recorded Investment   3,500
With no allowance recorded, Unpaid Principal Balance   3,500
With no allowance recorded, Average Recorded Investment 583 3,500
Recorded Investment   3,500
Unpaid Principal Balance   3,500
Average Recorded Investment $ 583 $ 3,500