Fair Values of Assets and Liabilities - Valuation Assumption Ranges for Derivative Commitments (Detail)	Jun. 30, 2014
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected loan close rate	39.00%
Inherent MSR value (basis points per loan)	0.48%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected loan close rate	100.00%
Inherent MSR value (basis points per loan)	2.09%
Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Expected loan close rate	77.00%
Inherent MSR value (basis points per loan)	1.23%