Derivative Financial Instruments - Summary of Carrying Amount Hedged Assets/(Liabilities) (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - Loans Net Of Unearned Income [Member]	Jun. 30, 2019 USD ($)
Carrying Amount of the Hedged Assets/(Liabilities)	$ 83,527
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(2,146)
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued	$ 0