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Loans Receivable, Net - Additional Information (Detail)		3 Months Ended		12 Months Ended
	May 02, 2016 USD ($)	Mar. 31, 2019 USD ($) SecurityLoan	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans on non-accrual commercial real estate, multi-family, land, construction, commercial and industrial loans		$ 250,000
Impaired loan portfolio total		34,451,000		$ 29,797,000
Allocation in allowance for loan losses		604,000		0
Average balance of impaired loans		32,100,000	$ 45,500,000
Troubled debt restructured loans		26,200,000		26,500,000
Loans with non-accrual of interest		$ 20,895,000		17,415,000
Number of residential mortgage loans | SecurityLoan		0
Non-accrual loan total troubled debt restructurings		$ 6,500,000		3,600,000
Specific reserves to loans accruing troubled debt restructurings		487,000		0
Troubled debt restructured loans with accrual interest		19,700,000		22,900,000
Sun Bancorp, Inc.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses, loans acquired	$ 0
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans with non-accrual of interest		8,611,000		$ 7,389,000
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount		2,100,000
Foreclosed property held		$ 841,000

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Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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