Fair Value - Fair Value Measurement (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain/(Loss) From Loan Sale	$ (2,062)
Interest Rate Movement Effect	(3,127)
Servicing Rights Value	8,717
Security Price Change	3,804
Total Fair Value Measurement Gain/(Loss)	7,332
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	462,329
Assumed Gain/(Loss) From Loan Sale	(1,108)
Interest Rate Movement Effect	(774)
Servicing Rights Value	5,069
Total Fair Value Measurement Gain/(Loss)	3,187
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	737,052
Security Price Change	3,804
Total Fair Value Measurement Gain/(Loss)	3,804
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	319,212
Assumed Gain/(Loss) From Loan Sale	(954)
Interest Rate Movement Effect	(2,353)
Servicing Rights Value	3,648
Total Fair Value Measurement Gain/(Loss)	$ 341