Loans Held for Sale, Loan Servicing and Mortgage Origination (Detail) - Characteristics and Sensitivity Analysis of the MSR (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Composition of residential loans serviced for others
Composition of residential loans serviced for others	100.00%
Weighted average life	4 years 9 months
Constant prepayment rate (CPR)	16.80%
Weighted average discount rate	10.40%
Effect on fair value due to change in interest rates
25 basis point increase (in Dollars)	$ 1,010
50 basis point increase (in Dollars)	2,009
25 basis point decrease (in Dollars)	(1,014)
50 basis point decrease (in Dollars)	$ (1,470)
Fixed Rate Residential Mortgage [Member]
Composition of residential loans serviced for others
Composition of residential loans serviced for others	99.10%
Adjustable Rate Residential Mortgage [Member]
Composition of residential loans serviced for others
Composition of residential loans serviced for others	0.90%

Composition of residential loans serviced for others

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Effect on fair value of a 25 basis point decrease in interest rates

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Effect on fair value of a 25 basis point increase in interest rates

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Effect on fair value of a 50 basis point decrease in interest rates

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Effect on fair value of a 50 basis point increase in interest rates

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Weighted average life of mortgage serving rights

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Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 60

-Paragraph 60

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6482714&loc=d3e14881-158438

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