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Fair Value Measurements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Securities
Dec. 31, 2013
Securities
Mar. 31, 2014
Assets Still Held [Member]
Mar. 31, 2013
Assets Still Held [Member]
Fair Value Measurements Disclosure [Line Items]        
Percentage of securities using market-based information 99.80%      
Percentage of securities using model-based techniques 0.20%      
Minimum corporation reserves for commercial loan $ 500      
Number of single-issuer trust preferred securities transferred between hierarchy levels 0 4    
Change in unrealized gains or losses included in earnings relating to assets still held 13,766 78 0 0
Impaired loans, carrying amount 9,525      
Allocated allowance for loan losses 1,268      
Fair value of allocated allowance 9,422      
Estimated costs to sell 1,165      
Provision for fair value measurements included in allowance for loan losses 622      
Carrying amount of OREO 4,946      
Written down of OREO 4,099      
Fair value of OREO 4,659 19,442    
Estimated cost to sell OREO 560      
Loss from OREO included in earnings $ 847      
Short-term borrowings approximate fair value for amounts that mature, days, less than 90 days