LOAN PORTFOLIO - Contractually Required Principal and Interest Cash Flows Expected to be Collected and Fair Value at Acquisition Related to Loans Acquired (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Feb. 27, 2015
Financing Receivable Impaired [Line Items]
Contractually outstanding principal and interest at acquisition			$ 166,947
Less: Nonaccretable difference			48,739
Cash flows expected to be collected at acquisition			118,208
Less: Accretable yield	38,319
Fair value of loans acquired	$ 79,889	[1]

[1] Amounts are preliminary estimates based on the best information available at the acquisition date and adjustments in future quarters may occur up to one year from the date of acquisition.