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Derivative Instruments and Hedging Activities - Derivatives Not Designated as Hedging Instruments (Detail) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 57,544invest_DerivativeNotionalAmount	$ 32,601invest_DerivativeNotionalAmount
Derivative Assets, Fair Value	788	346
Derivative Liabilities, Fair Value	112	0
Income for derivatives not designated as hedging instruments	330	(1,147)	715
Interest Rate Locks with Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	27,007	15,176
Forward Loan Sale Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	30,537	17,425
Net (Gain) Loss on Mortgage Banking Activities [Member] \| Interest Rate Locks with Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income for derivatives not designated as hedging instruments	467	(1,226)	467
Net (Gain) Loss on Mortgage Banking Activities [Member] \| Forward Loan Sale Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income for derivatives not designated as hedging instruments	(137)	79	248
Other Assets [Member] \| Interest Rate Locks with Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	788	321
Other Assets [Member] \| Forward Loan Sale Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets, Fair Value	0	25
Other Liabilities [Member] \| Interest Rate Locks with Customers [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities, Fair Value	0	0
Other Liabilities [Member] \| Forward Loan Sale Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities, Fair Value	$ 112	$ 0

Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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