Borrowed Funds - Scheduled Maturities of FHLB Advances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Due in one year or less	$ 32,515
Due after one year through two years	132,770
Due after two years through three years	179,299
Due after three years through four years	102,850
Due after four years through five years	60,000
Thereafter	214
Total FHLB advances	$ 507,648	$ 518,347