Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Total derivative assets	$ 22,087	$ 36,512
Total derivative liabilities	19,723	30,010
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	3,545	6,458
Total derivative liabilities	1,218
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Assets [Member]
Derivative [Line Items]
Total derivative assets	3,545	6,458
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Liabilities [Member]
Derivative [Line Items]
Total derivative liabilities	1,218
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	18,542	30,054
Total derivative liabilities	18,505	30,010
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Assets [Member]
Derivative [Line Items]
Total derivative assets	18,279	29,475
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Liabilities [Member]
Derivative [Line Items]
Total derivative liabilities	18,505	29,909
Not Designated as Hedging Instrument [Member] | Mortgage Contracts [Member] | Other Assets [Member]
Derivative [Line Items]
Total derivative assets	263	579
Not Designated as Hedging Instrument [Member] | Mortgage Contracts [Member] | Other Liabilities [Member]
Derivative [Line Items]
Total derivative liabilities		$ 101