Derivative Financial Instruments - Summary of Notional Balance and Fair Values of Derivatives Outstanding (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Notional Amount	$ 454,946,000	$ 363,305,000
Derivative Assets	10,146,000	8,736,000
Derivative Liabilities	4,870,000	8,012,000
Cash collateral, Derivative Liabilities	9,562,000	2,860,000
Netting adjustments, Derivative Assets	(9,329,000)	(7,336,000)
Netting adjustments, Derivative Liabilities	(9,329,000)	(7,336,000)
Net amount presented in Balance Sheet, Derivative Assets	817,000	1,400,000
Net amount presented in Balance Sheet, Derivative Liabilities	5,103,000	3,536,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	273,147,000	179,028,000
Derivative Assets	4,616,000	4,545,000
Derivative Liabilities		4,457,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	15,647,000	21,528,000
Derivative Assets	2,059,000	2,425,000
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	257,500,000	157,500,000
Derivative Assets	2,557,000	2,120,000
Derivative Liabilities		4,457,000
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	181,799,000	184,277,000
Derivative Assets	5,530,000	4,191,000
Derivative Liabilities	4,870,000	3,555,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	181,799,000	184,277,000
Derivative Assets	5,530,000	4,191,000
Derivative Liabilities	$ 4,870,000	$ 3,555,000