Annual report pursuant to Section 13 and 15(d)

Other Intangible Assets - Summary of Other Intangible Assets (Detail)

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Other Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 15,457 $ 15,457
Accumulated Amortization (14,122) (13,924)
Net Carrying Amount 1,335 1,533
Core Deposit Intangible [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization Period 8 years  
Gross Carrying Amount 13,137 13,137
Accumulated Amortization (13,137) (13,103)
Net Carrying Amount   34
Trade Names [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization Period 20 years  
Gross Carrying Amount 970 970
Accumulated Amortization (290) (242)
Net Carrying Amount 680 728
Client/Insured Relationships [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization Period 10 years  
Gross Carrying Amount 770 770
Accumulated Amortization (462) (385)
Net Carrying Amount 308 385
Carrier Relationships [Member]
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Amortization Period 15 years  
Gross Carrying Amount 580 580
Accumulated Amortization (233) (194)
Net Carrying Amount $ 347 $ 386