Loans Held for Sale, Loan Servicing and Mortgage Origination (Detail) - Changes in Fair Value of MSRs (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Decrease in fair value of MSRs	$ (431)	$ (538)
Gain (loss) related to derivatives	194	(406)
Net effect on Consolidated Statements of Income	$ (237)	$ (944)

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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