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Derivative Financial Instruments (Detail) - Nondesignated
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount $ 2,823,928,000
Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 257,928,000
Treasury Options  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 300,000,000
Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 75,000,000
Interest Rate Swap  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 350,000,000
Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 1,056,000,000
Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 785,000,000
Other assets  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 18,563,000 [1]
Other assets | Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 982,000 [1]
Other assets | Treasury Options  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 44,000 [1]
Other assets | Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 135,000 [1]
Other assets | Interest Rate Swap  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 572,000 [1]
Other assets | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 15,509,000 [1]
Other assets | Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,321,000 [1]
Other liabilities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 23,728,000 [1]
Other liabilities | Treasury Options  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 720,000 [1]
Other liabilities | Interest Rate Swap  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 5,289,000 [1]
Other liabilities | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 3,190,000 [1]
Other liabilities | Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss $ 14,529,000 [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.