Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Total derivative assets	$ 51,301	$ 29,005
Total derivative liabilities	12,393	12,550
Hedging Instruments and Hedged Items [Member]
Derivative [Line Items]
Total derivative assets	7,157	12,741
Total derivative liabilities	1,046	1,603
Hedging Instruments and Hedged Items [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	7,157	12,741
Total derivative liabilities	1,046	1,603
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Total derivative assets	44,144	16,264
Total derivative liabilities	11,347	10,947
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Total derivative assets	42,224	15,278
Total derivative liabilities	10,883	10,562
Not Designated as Hedging Instrument [Member] | Mortgage Contracts [Member]
Derivative [Line Items]
Total derivative assets	1,702	874
Total derivative liabilities	354	316
Not Designated as Hedging Instrument [Member] | Foreign Currency Contracts [Member]
Derivative [Line Items]
Total derivative assets	218	112
Total derivative liabilities	$ 110	$ 69