Fair Value - Fair Value Measurement (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (1,262)
Interest Rate Movement Effect	(6,325)
Servicing Rights Value	8,164
Security Price Change	4,859
Total Fair Value Measurement Gain/(Loss)	5,436
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	464,190
Assumed Gain/(Loss) From Loan Sale	(1,040)
Interest Rate Movement Effect	(2,210)
Servicing Rights Value	5,013
Total Fair Value Measurement Gain/(Loss)	1,763
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Forward Sales Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	678,216
Security Price Change	4,859
Total Fair Value Measurement Gain/(Loss)	4,859
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional or Principal Amount	266,604
Assumed Gain/(Loss) From Loan Sale	(222)
Interest Rate Movement Effect	(4,115)
Servicing Rights Value	3,151
Total Fair Value Measurement Gain/(Loss)	$ (1,186)