Fair Value - Fair Value Measurement (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ 147
Interest Rate Movement Effect	2,724
Servicing Rights Value	5,789
Security Price Change	(1,984)
Total Fair Value Measurement Gain/(Loss)	6,676
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	409,435
Assumed Gain/(Loss) From Loan Sale	(230)
Interest Rate Movement Effect	1,975
Servicing Rights Value	3,679
Total Fair Value Measurement Gain/(Loss)	5,424
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	525,038
Security Price Change	(1,984)
Total Fair Value Measurement Gain/(Loss)	(1,984)
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	185,955
Assumed Gain/(Loss) From Loan Sale	377
Interest Rate Movement Effect	749
Servicing Rights Value	2,110
Total Fair Value Measurement Gain/(Loss)	$ 3,236