Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans	$ 3,294	$ 17,496
Other real estate owned	19,442	19,311
Investment security, held-to-maturity:
Non-agency CMO		3,636
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans
Other real estate owned
Investment security, held-to-maturity:
Non-agency CMO
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans	3,235	14,325
Other real estate owned	4,485	5,771
Investment security, held-to-maturity:
Non-agency CMO
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans	59	3,171
Other real estate owned	14,957	13,540
Investment security, held-to-maturity:
Non-agency CMO		$ 3,636