Loans Receivable, Net - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
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				26,500,000
Specific reserves to loans accruing troubled debt restructurings		$ 424,000		476,000
Average balance of impaired loans	$ 31,500,000		$ 30,900,000
Commitments to lend additional funds to borrowers		0
Loans with non-accrual of interest		42,557,000		17,849,000
Financing receivables 90 days past due and still accruing		0		0
Troubled debt restructured loans		22,600,000		24,600,000
Non-accrual loan total troubled debt restructurings		6,200,000		6,600,000
Troubled debt restructured loans with accrual interest		16,400,000		18,000,000.0
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount		6,600,000
Loans with non-accrual of interest		8,211,000		207,000
Commercial real estate – owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount		5,500,000
Loans with non-accrual of interest		5,629,000		4,811,000
Commercial Real Estate – Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount		15,700,000
Loans with non-accrual of interest		17,922,000		2,917,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount		2,600,000
Foreclosed property held		248,000
Loans with non-accrual of interest		$ 7,676,000		$ 7,181,000