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Derivative Financial Instruments (Detail) - Nondesignated
Mar. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount $ 3,159,194,000
Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 630,194,000
Treasury Options  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 510,000,000
Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 50,000,000
Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 1,084,000,000
Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 715,000,000
Swaps  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 170,000,000
Other assets  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 13,265,000 [1]
Other assets | Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 6,689,000 [1]
Other assets | Treasury Options  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,072,000 [1]
Other assets | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 128,000 [1]
Other assets | Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 3,880,000 [1]
Other assets | Swaps  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,496,000 [1]
Other liabilities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 7,260,000 [1]
Other liabilities | Treasury Options  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 61,000 [1]
Other liabilities | Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 17,000 [1]
Other liabilities | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 6,861,000 [1]
Other liabilities | Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss $ 321,000 [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.