Fair Value - Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (992)
Interest Rate Movement Effect	1,244
Servicing Rights Value	5,117
Security Price Change	(1,967)
Total Fair Value Measurement Gain/(Loss)	3,402
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	357,473
Assumed Gain/(Loss) From Loan Sale	(812)
Interest Rate Movement Effect	1,338
Servicing Rights Value	3,417
Total Fair Value Measurement Gain/(Loss)	3,943
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	471,289
Security Price Change	(1,967)
Total Fair Value Measurement Gain/(Loss)	(1,967)
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	153,359
Assumed Gain/(Loss) From Loan Sale	(180)
Interest Rate Movement Effect	(94)
Servicing Rights Value	1,700
Total Fair Value Measurement Gain/(Loss)	$ 1,426