Fair Value - Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount
Assumed Gain/(Loss) From Loan Sale	(1,508)
Interest Rate Movement Effect	(1,085)
Servicing Rights Value	5,481
Security Price Change	312
Total Fair Value Measurement Gain/(Loss)	3,200
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	353,267
Assumed Gain/(Loss) From Loan Sale	(1,011)
Interest Rate Movement Effect	(211)
Servicing Rights Value	3,374
Security Price Change
Total Fair Value Measurement Gain/(Loss)	2,152
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	468,249
Assumed Gain/(Loss) From Loan Sale
Interest Rate Movement Effect
Servicing Rights Value
Security Price Change	312
Total Fair Value Measurement Gain/(Loss)	312
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	197,861
Assumed Gain/(Loss) From Loan Sale	(497)
Interest Rate Movement Effect	(874)
Servicing Rights Value	2,107
Security Price Change
Total Fair Value Measurement Gain/(Loss)	$ 736