Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Total derivative assets	$ 16,802	$ 17,701
Total derivative liabilities	18,992	23,574
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	2,973	3,056
Total derivative liabilities	9,803	11,582
Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	2,973	3,056
Total derivative liabilities	9,803	11,582
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	13,829	14,645
Total derivative liabilities	9,189	11,992
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	12,130	11,903
Total derivative liabilities	9,176	11,992
Not Designated as Hedging Instrument [Member] | Mortgage Contracts [Member]
Derivative [Line Items]
Total derivative assets	1,699	$ 2,742
Not Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member]
Derivative [Line Items]
Total derivative liabilities	$ 13