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Derivative Financial Instruments (Detail) - Nondesignated
Jun. 30, 2017
USD ($)
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount $ 1,632,142,000
Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 267,142,000
Treasury Options  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 225,000,000
Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 25,000,000
Interest Rate Swap  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 385,000,000
Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 405,000,000
Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Derivative financial instruments held, notional amount 325,000,000
Other assets  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 3,640,000 [1]
Other assets | Interest rate lock commitments  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,027,000 [1]
Other assets | Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 5,000 [1]
Other assets | Interest Rate Swap  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 770,000 [1]
Other assets | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 737,000 [1]
Other assets | Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,101,000 [1]
Other liabilities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 5,913,000 [1]
Other liabilities | Treasury Options  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 582,000 [1]
Other liabilities | Eurodollar Futures  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 3,000 [1]
Other liabilities | Interest Rate Swap  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 4,056,000 [1]
Other liabilities | Forward commitments to sell loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 770,000 [1]
Other liabilities | Forward commitments to buy loans/mortgage-backed securities  
Derivatives, Fair Value [Line Items]  
Unrealized Loss $ 502,000 [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.