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Fair Value - Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (1,249)
Interest Rate Movement Effect	(276)
Servicing Rights Value	2,190
Security Price Change	(57)
Total Fair Value Measurement Gain/(Loss)	608
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	199,297
Assumed Gain/(Loss) From Loan Sale	(642)
Interest Rate Movement Effect	91
Servicing Rights Value	1,288
Total Fair Value Measurement Gain/(Loss)	737
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	297,332
Security Price Change	(57)
Total Fair Value Measurement Gain/(Loss)	(57)
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	128,122
Assumed Gain/(Loss) From Loan Sale	(607)
Interest Rate Movement Effect	(367)
Servicing Rights Value	902
Total Fair Value Measurement Gain/(Loss)	$ (72)