Loans - Pre-Modification and Post-Modification Outstanding Recorded Investments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	117	44
Pre-Modification Outstanding Recorded Investment	$ 81,515	$ 24,025
Post-Modification Outstanding Recorded Investment	$ 77,182	$ 23,623
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	111	25
Pre-Modification Outstanding Recorded Investment	$ 77,781	$ 16,251
Post-Modification Outstanding Recorded Investment	$ 73,503	$ 15,105
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	2	9
Pre-Modification Outstanding Recorded Investment	$ 3,143	$ 6,175
Post-Modification Outstanding Recorded Investment	$ 3,098	$ 6,956
Commercial real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	2	8
Pre-Modification Outstanding Recorded Investment	$ 3,143	$ 5,643
Post-Modification Outstanding Recorded Investment	$ 3,098	$ 6,600
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract		1
Pre-Modification Outstanding Recorded Investment		$ 532
Post-Modification Outstanding Recorded Investment		$ 356
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	2	8
Pre-Modification Outstanding Recorded Investment	$ 376	$ 1,500
Post-Modification Outstanding Recorded Investment	$ 374	$ 1,461
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	2	2
Pre-Modification Outstanding Recorded Investment	$ 215	$ 99
Post-Modification Outstanding Recorded Investment	$ 207	$ 101