Derivatives - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) Derivatives	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Derivatives	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Risk participation Agreements [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (160)	$ (45)	$ (2,122)	$ (88)
Risk Participation Agreements Purchased [Domain]
Risk participation Agreements [Line Items]
Number of interest rate swaps | Derivatives	38		38
Risk Participation Agreements Sold [Domain]
Risk participation Agreements [Line Items]
Number of interest rate swaps | Derivatives	14		14
Interest Rate Swap [Member]
Risk participation Agreements [Line Items]
Derivative Instruments Designated As Hedging Instruments Interest Income	$ 0	0	$ 0	(118)
Derivative Instruments Designated As Hedging Instruments Interest Expense	208	(70)	219	(70)
Derivative, Net Hedge Ineffectiveness Gain (Loss)	0	0	0	7
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Fair Value, Net	4,091		4,091		$ (801)
Derivative, Notional Amount	70,000		70,000		70,000
Forward Contracts [Member]
Risk participation Agreements [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	0	0	0	0
Derivative Liability, Cost Basis, Gross Asset	21,200		21,200		9,800
Derivative Liability, Fair Value, Gross Asset	24,500		24,500		10,700
Derivative Liability, Notional Amount, Gross Asset	49,100		49,100		25,500
Derivative, Gain (Loss) on Derivative, Net	300		1,500
Forward Contracts [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Fair Value, Net	195		195		63
Derivative, Notional Amount	42,000		42,000		30,000
Derivative, Gain (Loss) on Derivative, Net	(102)	201	132	122
Foreign Exchange [Member]
Risk participation Agreements [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	3	3	15	4
Interest Rate Contract [Member]
Risk participation Agreements [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	0	$ 0	0	$ 0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Fair Value, Net	(2)		(2)		41
Derivative, Notional Amount	2,362		2,362		4,789
Derivative Liability, Cost Basis, Gross Asset	2,400		2,400		4,800
Derivative Liability, Fair Value, Gross Asset	2,400		2,400		$ 4,800
2024 [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	30,000		30,000
2026 [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Risk participation Agreements [Line Items]
Derivative, Notional Amount	$ 40,000		$ 40,000