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Fair Value - Fair Value Measurement (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Assumed Gain (Loss) From Loan Sale $ (3,381)
Interest Rate Movement Effect (832)
Servicing Rights Value 1,222
Security Price Change 490
Total Fair Value Measurement Gain/(Loss) (2,501)
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Rate lock commitments [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Notional or Principal Amount 138,865
Assumed Gain (Loss) From Loan Sale (1,384)
Interest Rate Movement Effect (153)
Servicing Rights Value 443
Security Price Change   
Total Fair Value Measurement Gain/(Loss) (1,094)
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Forward sales contracts [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Notional or Principal Amount 305,322
Assumed Gain (Loss) From Loan Sale   
Interest Rate Movement Effect   
Servicing Rights Value   
Security Price Change 490
Total Fair Value Measurement Gain/(Loss) 490
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages held for sale [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Notional or Principal Amount 190,826
Assumed Gain (Loss) From Loan Sale (1,997)
Interest Rate Movement Effect (679)
Servicing Rights Value 779
Security Price Change   
Total Fair Value Measurement Gain/(Loss) $ (1,897)