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Off Balance Sheet Arrangements and Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Dec. 31, 2014
Dec. 31, 2015
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 $ 3,000
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 1,096,532
Commercial and commercial real estate    
Guarantees    
Unused Commitments to Extend Credit 526,133 631,780
Consumer loans    
Guarantees    
Unused Commitments to Extend Credit 56,312 60,198
Residential 1-4 family    
Guarantees    
Unused Commitments to Extend Credit 20,524 24,863
Commercial and financial standby letters of credit [Member]    
Guarantees    
Unused Commitments to Extend Credit 20,082 18,709
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 $ 1,832,082