Statement of Cash Flows Supplemental Disclosure - Supplemental Disclosures of Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]
Interest on deposits and borrowings	$ 2,120	$ 3,068
Supplemental schedule of noncash activities:
Transfers from loans to real estate owned and other repossessed assets	$ 493	$ 233