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Loans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($) SecurityLoan	Dec. 31, 2018 USD ($) SecurityLoan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Net discount on loans	$ 12,315,000	$ 18,811,000
Impaired loans	5,664,000	7,865,000
Unearned income	3,114,000	2,716,000
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Accrued interest receivable for loans	6,575,000	7,017,000
Unfunded commitments to borrowers whose loans had been modified	$ 0	$ 0
Residential mortgages
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified loans with subsequent default within twelve months | SecurityLoan	2	6
Modified loans that subsequently defaulted within twelve months	$ 617,000	$ 619,000
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified loans with subsequent default within twelve months | SecurityLoan	2	2
Modified loans that subsequently defaulted within twelve months	$ 10,000	$ 32,000
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified loans with subsequent default within twelve months | SecurityLoan		4
Modified loans that subsequently defaulted within twelve months		$ 7,022,000
Number of defaulted loans individually evaluated for impairment | SecurityLoan	2
Defaulted loans individually evaluated for impairment	$ 6,910,000
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of modified loans with subsequent default within twelve months | SecurityLoan		2
Modified loans that subsequently defaulted within twelve months		$ 714,000

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Unearned discounts (other than cash or quantity discounts and the like), finance charges, and interest included in the face amount of receivables, that are shown as a deduction from the related receivables. For example, 1) finance charges booked as a receivable when a loan is made and recognized as income at a later date; and 2) interest charges deducted from the face loan amount, resulting in a discounted amount actually advanced to the borrower (wherein the receivable includes the amount actually advanced to the borrower and the as yet unearned interest income).

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of discount (premium) attributable to other factors on financing receivable purchased with credit deterioration.

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Amount of financing receivable 90 days or more past due and still accruing.

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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