Fair Value Measurements - Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy (Detail) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
ASSETS
Loans held for sale		$ 1,516
Impaired loans	16,398	19,197
Other real estate owned	318	317
Mortgage servicing rights	1,343	1,025
Total Assets	18,059	22,055
Level 1 [Member]
ASSETS
Loans held for sale
Impaired loans
Other real estate owned
Mortgage servicing rights
Total Assets
Level 2 [Member]
ASSETS
Loans held for sale
Impaired loans
Other real estate owned
Mortgage servicing rights
Total Assets
Level 3 [Member]
ASSETS
Loans held for sale		1,516
Impaired loans	16,398	19,197
Other real estate owned	318	317
Mortgage servicing rights	1,343	1,025
Total Assets	$ 18,059	$ 22,055