Fair Value - Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (2,547)
Interest Rate Movement Effect	(14,067)
Servicing Rights Value	3,784
Security Price Change	12,810
Total Fair Value Measurement Gain/(Loss)	(20)
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	317,781
Assumed Gain/(Loss) From Loan Sale	(1,135)
Interest Rate Movement Effect	(4,759)
Servicing Rights Value	2,294
Total Fair Value Measurement Gain/(Loss)	(3,600)
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	467,921
Security Price Change	12,810
Total Fair Value Measurement Gain/(Loss)	12,810
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	185,515
Assumed Gain/(Loss) From Loan Sale	(1,412)
Interest Rate Movement Effect	(9,308)
Servicing Rights Value	1,490
Total Fair Value Measurement Gain/(Loss)	$ (9,230)