Fair Value - Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (2,481)
Interest Rate Movement Effect	4,444
Servicing Rights Value	3,503
Security Price Change	(5,905)
Total Fair Value Measurement Gain/(Loss)	(439)
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	326,729
Assumed Gain/(Loss) From Loan Sale	(1,675)
Interest Rate Movement Effect	3,813
Servicing Rights Value	2,341
Security Price Change
Total Fair Value Measurement Gain/(Loss)	4,479
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	443,162
Assumed Gain/(Loss) From Loan Sale
Interest Rate Movement Effect
Servicing Rights Value
Security Price Change	(5,905)
Total Fair Value Measurement Gain/(Loss)	(5,905)
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	152,941
Assumed Gain/(Loss) From Loan Sale	(806)
Interest Rate Movement Effect	631
Servicing Rights Value	1,162
Security Price Change
Total Fair Value Measurement Gain/(Loss)	$ 987