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Loans and Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties	$ 38,200
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates	30,816	$ 6,355	$ 36,047
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates	30,685	$ 5,455	$ 26,409
Loan classified as non accrual TDRs	194,000,000
Commercial And Industrial Sector And One To Four Family Mortgage Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan classified as non accrual TDRs	1,100
Financing Receivable Troubled Debt Restructurings Rate Reductions
Financing Receivable, Recorded Investment [Line Items]
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates	32,700
Financing Receivable Troubled Debt Restructurings Forbearance of Arrears
Financing Receivable, Recorded Investment [Line Items]
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates	$ 7,800

X

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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+ References

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-Publisher FASB
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-Name Accounting Standards Codification
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