FAIR VALUE - Impairment of Valuation Adjustments were Recorded for Assets Recognized at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified							3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Loans Receivable [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Loans Receivable [Member]		Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Loans Receivable [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Loans Receivable [Member]		Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Other Real Estate Owned [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Other Real Estate Owned [Member]		Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Other Real Estate Owned [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Other Real Estate Owned [Member]		Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Mortgage Servicing Rights [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Mortgage Servicing Rights [Member]		Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Mortgage Servicing Rights [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Mortgage Servicing Rights [Member]		Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Loans Held For Sale [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Loans Held For Sale [Member]		Sep. 30, 2014 Fair Value Measurements Nonrecurring [Member] Loans Held For Sale [Member]		Sep. 30, 2013 Fair Value Measurements Nonrecurring [Member] Loans Held For Sale [Member]		Sep. 30, 2014 Fair Value Inputs Level 1 [Member]		Sep. 30, 2013 Fair Value Inputs Level 1 [Member]		Sep. 30, 2014 Fair Value Inputs Level 2 [Member]		Sep. 30, 2013 Fair Value Inputs Level 2 [Member]		Sep. 30, 2014 Fair Value Inputs Level 3 [Member]		Sep. 30, 2013 Fair Value Inputs Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets Fair Value Adjustment							$ (6,495)	[1]	$ (7,034)	[2]	$ (30,376)	[1]	$ (24,431)	[2]	$ (2,287)	[3]	$ (4,479)	[3]	$ (10,544)	[3]	$ (15,505)	[3]	$ (46)	[4]	$ 32	[5]	$ (226)	[4]	$ 589	[5]	$ 0	[6]	$ (397)	[7]	$ 0	[6]	$ (10,073)	[7]
Loans receivable																																							0	[1]	0	[2]	0	[1]	0	[2]	461,882	[1]	450,267	[2]
Other Real Estate Owned																																							0	[3]	0	[3]	0	[3]	0	[3]	112,803	[3]	133,284	[3]
Mortgage servicing rights	22,503	22,270	21,987	21,885	19,979	17,524																																	0	[4]	0	[5]	0	[4]	0	[5]	22,503	[4]	21,885	[5]
Loans held for sale																																							$ 0	[6]	$ 0	[7]	$ 0	[6]	$ 0	[7]	$ 54,641	[6]	$ 80,234	[7]

[1] Mainly impaired commercial and construction loans. The impairment was generally measured based on the fair value of the collateral. The fair value was derived from external appraisals that take into consideration prices in observed transactions involving similar assets in similar locations but adjusted for specific characteristics and assumptions of the collateral (e.g. absorption rates), which are not market observable.

[2]  Mainly impaired commercial and construction loans. The impairment was generally measured based on the fair value of the collateral. The fair value was derived from external appraisals that take into consideration prices in observed transactions involving similar assets in similar locations but adjusted for specific characteristics and assumptions of the collateral (e.g. absorption rates), which are not market observable.

[3] The fair value was derived from appraisals that take into consideration prices in observed transactions involving similar assets in similar locations but adjusted for specific characteristics and assumptions of the properties (e.g. absorption rates and net operating income of income producing properties) which are not market observable. Losses were related to market valuation adjustments after the transfer of the loans to the OREO portfolio.

[4] Fair value adjustments to mortgage servicing rights were mainly due to assumptions associated with mortgage prepayment rates. The Corporation carries its mortgage servicing rights at the lower of cost or market, measured at fair value on a non-recurring basis. Assumptions for the value of mortgage servicing rights include: Prepayment rate 9.71%, Discount Rate 10.63%.

[5] Fair value adjustments to the mortgage servicing rights were mainly due to assumptions associated with mortgage prepayments rates. The Corporation carries its mortgage servicing rights at the lower of cost or market, measured at fair value on a non-recurring basis. Assumptions for the value of mortgage servicing rights include: Prepayment Rate 9.37%, Discount Rate 10.59%.

[6] The value of these loans was derived from external appraisals, adjusted for specific characteristics of the loans, and for loans with signed sale agreements, the value was determined based on the sales price on such agreements.

[7] The value of these loans was derived from external appraisals, adjusted for specific characteristics of the loans, and, for loans with signed sale agreements, the value was determined based on the sales price on such agreements.