v3.19.1
Basis of Presentation and Significant Accounting Policies (Details)
12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2018
USD ($)
segment
branch
office
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2019
USD ($)
Product Information [Line Items]          
Number of operating segments | segment   1      
Number of loan producing offices | office   10      
Reserve and clearing required balance   $ 0 $ 0    
Qualified affordable housing project investments   2,400,000 2,700,000    
Unfunded commitments   831,000 2,000,000    
Amortization recognized on Qualified Affordable Housing Projects   283,000 219,000 $ 54,000  
Federal tax credits and other benefits   290,000 229,000 $ 59,000  
Affordable Housing Project Investment, Write-down, Amount   $ 0 0    
Reclassification of disproportionate tax effect     0    
Subsequent Event | ASU 2016-02          
Product Information [Line Items]          
Right-of-Use Asset         $ 9,600,000
Operating lease liability         $ 10,600,000
Accumulated Other Comprehensive Loss          
Product Information [Line Items]          
Reclassification of disproportionate tax effect $ (242,000)   (242,000)    
Retained Earnings          
Product Information [Line Items]          
Reclassification of disproportionate tax effect $ 242,000   $ 242,000    
Furniture, fixtures and equipment | Minimum          
Product Information [Line Items]          
Estimated useful lives   3 years      
Furniture, fixtures and equipment | Maximum          
Product Information [Line Items]          
Estimated useful lives   7 years      
Closed Loans          
Product Information [Line Items]          
Charge-off time period   120 days      
Open Loans          
Product Information [Line Items]          
Charge-off time period   180 days      
California          
Product Information [Line Items]          
Number of full-service branches | branch   11      
New Jersey          
Product Information [Line Items]          
Number of full-service branches | branch   1      
New York          
Product Information [Line Items]          
Number of full-service branches | branch   1