Fair Value of Financial Instruments (Detail) - Financial instruments measured at fair value on a recurring basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2011
Obligations of US government agencies and corporations	$ 1,278	$ 1,823	$ 1,863
State and municipal obligations	13,483	488	481
Collateralized debt obligations	3,332	3,247	3,074
Mortgage-backed securities	74,304	84,399	88,957
Collateralized mortgage obligations	154,883	309,295	312,513
Other securities	6,518	5,298	5,220
Securities available for sale	253,798	404,550	412,108
Residential mortgage servicing rights	13,910	10,663	10,572
Derivative financial instruments	2,561	2,238	1,816
Total assets at fair value	270,269	417,451	424,496
Fair Value, Inputs, Level 1 [Member]
Obligations of US government agencies and corporations	0	0	0
State and municipal obligations	0	0	0
Collateralized debt obligations	0	0	0
Mortgage-backed securities	0	0	0
Collateralized mortgage obligations	0	0	0
Other securities	1,929	1,000	1,000
Securities available for sale	1,929	1,000	1,000
Residential mortgage servicing rights	0	0	0
Derivative financial instruments	2,561	2,238	1,816
Total assets at fair value	4,490	3,238	2,816
Fair Value, Inputs, Level 2 [Member]
Obligations of US government agencies and corporations	1,278	1,823	1,863
State and municipal obligations	13,483	488	481
Collateralized debt obligations	0	0	0
Mortgage-backed securities	74,304	84,399	80,919
Collateralized mortgage obligations	154,883	256,615	63,079
Other securities	2,999	3,197	1,499
Securities available for sale	246,947	346,522	147,841
Residential mortgage servicing rights	0	0	0
Derivative financial instruments	0	0	0
Total assets at fair value	246,947	346,522	147,841
Fair Value, Inputs, Level 3 [Member]
Obligations of US government agencies and corporations	0	0	0
State and municipal obligations	0	0	0
Collateralized debt obligations	3,332	3,247	3,074
Mortgage-backed securities	0	0	8,038
Collateralized mortgage obligations	0	52,680	249,434
Other securities	1,590	1,101	2,721
Securities available for sale	4,922	57,028	263,267
Residential mortgage servicing rights	13,910	10,663	10,572
Derivative financial instruments	0	0	0
Total assets at fair value	$ 18,832	$ 67,691	$ 273,839

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from mortgage servicing rights.

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Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets.

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- Definition

The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by state and local governments and authorities. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages) as of the balance sheet date which have been categorized as available-for-sale.

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-Glossary Mortgage-Backed Securities

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All other marketable securities, which aren't categorized as trading, available-for-sale, or held-to-maturity and which are not otherwise listed in the existing taxonomy, intended to be held for less than one year or the normal operating cycle, whichever is longer.

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The aggregate amount of the participating mortgage obligation at the end of the accounting period.

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