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	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Loans held for sale	$ 1,516
Impaired loans	19,197	44,059
Other real estate owned	317	585
Mortgage servicing rights	1,025	2,106
Total Assets	22,055	46,750
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	19,197	44,059
Other real estate owned	317	585
Mortgage servicing rights	1,025	2,106
Total Assets	$ 22,055	$ 46,750