Quantitative Information About Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	7.25%
Fair value, measurements, recurring | Mortgage Servicing Rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 8,407	$ 13,535
Valuation Technique(s)	Discounted cash flow	Discounted cash flow
Minimum | Fair value, measurements, recurring | Mortgage Servicing Rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	10.00%	10.00%
Fair Value Inputs, Prepayment Rate	3.92%	4.19%
Maximum | Fair value, measurements, recurring | Mortgage Servicing Rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	17.89%	17.94%
Fair Value Inputs, Prepayment Rate	34.54%	34.54%
Weighted Average | Fair value, measurements, recurring | Mortgage Servicing Rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	10.81%	10.26%
Fair Value Inputs, Prepayment Rate	13.17%	9.85%