Fair Value - Fair Value Measurement (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ 346
Interest Rate Movement Effect	4,781
Servicing Rights Value	7,241
Security Price Change	(5,103)
Total Fair Value Measurement Gain/(Loss)	7,265
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	524,455
Assumed Gain/(Loss) From Loan Sale	(304)
Interest Rate Movement Effect	3,335
Servicing Rights Value	4,548
Total Fair Value Measurement Gain/(Loss)	7,579
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	718,451
Security Price Change	(5,103)
Total Fair Value Measurement Gain/(Loss)	(5,103)
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	270,356
Assumed Gain/(Loss) From Loan Sale	650
Interest Rate Movement Effect	1,446
Servicing Rights Value	2,693
Total Fair Value Measurement Gain/(Loss)	$ 4,789