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Other Long-term Debt - Summary of Other Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Long Term Debt Maturity [Line Items]    
2013, Amount $ 30,085  
2014, Amount 57,890  
2015, Amount 79,970  
2016, Amount 387  
2017, Amount 405  
Thereafter, Amount 5,734  
Total, Amount 174,471 101,664
ESOP loan [Member]
    
Long Term Debt Maturity [Line Items]    
2012, Amount   1,600
2012, Weighted Average Contractual Rate   LIBOR + 1.00 %
2012, Weighted Average Effective Rate   LIBOR + 1.00 %
Borrowings from FHLB [Member]
    
Long Term Debt Maturity [Line Items]    
2012, Amount   25,585
2013, Amount 30,085 30,085
2014, Amount 57,890 7,891
2015, Amount 79,970 29,970
2016, Amount 387 388
2017, Amount 405  
Thereafter, Amount   6,145
Thereafter, Amount $ 5,734  
Borrowings from FHLB [Member]
    
Long Term Debt Maturity [Line Items]    
2012, Weighted Average Contractual Rate   1.54%
2012, Weighted Average Effective Rate   1.53%
2013, Weighted Average Contractual Rate 2.32% 2.32%
2014, Weighted Average Contractual Rate 1.13% 5.37%
2015, Weighted Average Contractual Rate 0.82% 1.37%
2016, Weighted Average Contractual Rate 4.64% 4.64%
2017, Weighted Average Contractual Rate 4.64%  
Thereafter, Weighted Average Contractual Rate   4.66%
Thereafter, Weighted Average Contractual Rate 4.66%  
2013, Weighted Average Effective Rate 2.32% 2.32%
2014, Weighted Average Effective Rate 1.13% 5.35%
2015, Weighted Average Effective Rate 0.82% 1.37%
2016, Weighted Average Effective Rate 4.64% 4.64%
2017, Weighted Average Effective Rate 4.64%  
Thereafter, Weighted Average Effective Rate   4.66%
Thereafter, Weighted Average Effective Rate 4.66%