Fair Value - Fair Value Measurement (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (789)
Interest Rate Movement Effect	1,105
Servicing Rights Value	7,321
Security Price Change	(1,130)
Total Fair Value Measurement Gain/(Loss)	6,507
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	553,600
Assumed Gain/(Loss) From Loan Sale	(738)
Interest Rate Movement Effect	1,024
Servicing Rights Value	4,591
Total Fair Value Measurement Gain/(Loss)	4,877
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	757,756
Security Price Change	(1,130)
Total Fair Value Measurement Gain/(Loss)	(1,130)
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	288,543
Assumed Gain/(Loss) From Loan Sale	(51)
Interest Rate Movement Effect	81
Servicing Rights Value	2,730
Total Fair Value Measurement Gain/(Loss)	$ 2,760