Derivative Financial Instruments (Detail) - Nondesignated	Jun. 30, 2016 USD ($)
Derivatives, Fair Value [Line Items]
Derivative financial instruments held, notional amount	$ 3,578,902,000
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Derivative financial instruments held, notional amount	739,902,000
Treasury Options
Derivatives, Fair Value [Line Items]
Derivative financial instruments held, notional amount	595,000,000
Eurodollar Futures
Derivatives, Fair Value [Line Items]
Derivative financial instruments held, notional amount	175,000,000
Swaps
Derivatives, Fair Value [Line Items]
Derivative financial instruments held, notional amount	200,000,000
Forward commitments to sell loans/mortgage-backed securities
Derivatives, Fair Value [Line Items]
Derivative financial instruments held, notional amount	1,144,000,000
Forward commitments to buy loans/mortgage-backed securities
Derivatives, Fair Value [Line Items]
Derivative financial instruments held, notional amount	725,000,000
Other assets
Derivatives, Fair Value [Line Items]
Unrealized Gain	22,735,000	[1]
Other assets | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Unrealized Gain	10,133,000	[1]
Other assets | Treasury Options
Derivatives, Fair Value [Line Items]
Unrealized Gain	216,000	[1]
Other assets | Swaps
Derivatives, Fair Value [Line Items]
Unrealized Gain	4,202,000	[1]
Other assets | Forward commitments to buy loans/mortgage-backed securities
Derivatives, Fair Value [Line Items]
Unrealized Gain	8,184,000	[1]
Other liabilities
Derivatives, Fair Value [Line Items]
Unrealized Loss	13,076,000	[1]
Other liabilities | Treasury Options
Derivatives, Fair Value [Line Items]
Unrealized Loss	497,000	[1]
Other liabilities | Eurodollar Futures
Derivatives, Fair Value [Line Items]
Unrealized Loss	138,000	[1]
Other liabilities | Forward commitments to sell loans/mortgage-backed securities
Derivatives, Fair Value [Line Items]
Unrealized Loss	$ 12,441,000	[1]

[1] Derivatives in a net gain position are recorded as "Other assets" and derivatives in a net loss position are recorded as "Other liabilities" in the Consolidated Statements of Condition.