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Off Balance Sheet Arrangements and Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Minimum |  |
Guarantees |  |
Assessment rate for financial institutions in the lowest risk category (as a percent) | 0.025% |
Assessment rate for financial institutions in the highest risk category (as a percent) | 0.30% |
Maximum |  |
Guarantees |  |
Assessment rate for financial institutions in the lowest risk category (as a percent) | 0.09% |
Assessment rate for financial institutions in the highest risk category (as a percent) | 0.45% |
American Savings Bank (ASB) |  |
Guarantees |  |
FDIC insurance assessment | $ 3,000 | $ 2,900
Indemnification Agreement | American Savings Bank (ASB) |  |
Guarantees |  |
Accrued indemnification litigation obligation | 1,100 |
Home equity line of credit |  |
Guarantees |  |
Unused Commitments to Extend Credit | 1,089,633 | 1,011,334
Commercial and commercial real estate |  |
Guarantees |  |
Unused Commitments to Extend Credit | 526,133 | 527,987
Consumer loans |  |
Guarantees |  |
Unused Commitments to Extend Credit | 56,312 | 58,080
Residential 1-4 family |  |
Guarantees |  |
Unused Commitments to Extend Credit | 20,524 | 14,241
Commercial and financial standby letters of credit [Member] |  |
Guarantees |  |
Unused Commitments to Extend Credit | 20,082 | 15,747
March 2011 Class Action Lawsuit |  |
Guarantees |  |
Tentative settlement amount | 2,000 |
Loss contingency reserve | 2,000 |
Reserve for Off-balance Sheet Activities [Member] |  |
Guarantees |  |
Unused Commitments to Extend Credit | $ 1,712,684 | $ 1,627,389

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