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Derivative Financial Instruments (Detail) - Nondesignated
Dec. 31, 2015
USD ($)
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount $ 1,952,638,000
Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 387,638,000
Treasury Options  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 245,000,000
Treasury Futures  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 100,000,000
Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 35,000,000
Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 625,000,000
Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 560,000,000
Other assets  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 3,893,000 [1]
Other assets | Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 2,526,000 [1]
Other assets | Treasury Options  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 25,000 [1]
Other assets | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,342,000 [1]
Other liabilities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 4,322,000 [1]
Other liabilities | Treasury Options  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 1,358,000 [1]
Other liabilities | Treasury Futures  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 172,000 [1]
Other liabilities | Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 9,000 [1]
Other liabilities | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 696,000 [1]
Other liabilities | Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss $ 2,087,000 [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.