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Loans Receivable and Allowance for Loan Losses (Loan Portfolio By Pass Rating) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 2,142,116 $ 1,662,809 $ 1,597,038
Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 2,097,497 1,629,038  
Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 11,014 12,041  
Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 33,569 21,681  
Loss [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 36 49  
Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 249,996 231,765 218,369
Commercial and Multi-family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,622,881 1,260,730 1,183,577
Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 56,067 50,497 73,376
Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 137,767 70,832 71,982
Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 74,507 47,680 48,362
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 898 1,305 1,372
Originated loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,866,295 1,553,114 1,476,324
Originated loans [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,841,925 1,527,551  
Originated loans [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 8,952 10,054  
Originated loans [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 15,382 15,467  
Originated loans [Member] | Loss [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 36 42  
Originated loans [Member] | Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 203,661 182,544 164,562
Originated loans [Member] | Residential [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 198,623 174,985  
Originated loans [Member] | Residential [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 2,919 5,014  
Originated loans [Member] | Residential [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 2,119 2,545  
Originated loans [Member] | Commercial and Multi-family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,452,907 1,213,390 1,130,902
Originated loans [Member] | Commercial and Multi-family [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,438,487 1,199,786  
Originated loans [Member] | Commercial and Multi-family [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 3,838 2,676  
Originated loans [Member] | Commercial and Multi-family [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 10,582 10,928  
Originated loans [Member] | Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 51,599 50,497 73,376
Originated loans [Member] | Construction [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 51,599 50,262  
Originated loans [Member] | Construction [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross   235  
Originated loans [Member] | Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 105,101 66,775 68,230
Originated loans [Member] | Commercial Business [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 101,090 63,323  
Originated loans [Member] | Commercial Business [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 1,786 1,672  
Originated loans [Member] | Commercial Business [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 2,189 1,738  
Originated loans [Member] | Commercial Business [Member] | Loss [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 36 42  
Originated loans [Member] | Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 52,382 38,725 38,058
Originated loans [Member] | Home Equity [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 51,533 38,018  
Originated loans [Member] | Home Equity [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 399 451  
Originated loans [Member] | Home Equity [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 450 256  
Originated loans [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 645 1,183 1,196
Originated loans [Member] | Consumer [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 593 1,177  
Originated loans [Member] | Consumer [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 10 6  
Originated loans [Member] | Consumer [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 42    
Acquired loans recorded at fair value [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 258,429 107,551 118,547
Acquired loans recorded at fair value [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 252,703 101,116  
Acquired loans recorded at fair value [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 988 903  
Acquired loans recorded at fair value [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 4,738 5,525  
Acquired loans recorded at fair value [Member] | Loss [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross   7  
Acquired loans recorded at fair value [Member] | Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 44,933 47,808 52,382
Acquired loans recorded at fair value [Member] | Residential [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 41,818 44,472  
Acquired loans recorded at fair value [Member] | Residential [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 474 481  
Acquired loans recorded at fair value [Member] | Residential [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 2,641 2,855  
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 158,094 46,609 51,933
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 155,672 43,569  
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 393 402  
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 2,029 2,638  
Acquired loans recorded at fair value [Member] | Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,798
Acquired loans recorded at fair value [Member] | Construction [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,749    
Acquired loans recorded at fair value [Member] | Construction [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 49    
Acquired loans recorded at fair value [Member] | Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 31,680 4,057 3,752
Acquired loans recorded at fair value [Member] | Commercial Business [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 31,627 4,057  
Acquired loans recorded at fair value [Member] | Commercial Business [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 53    
Acquired loans recorded at fair value [Member] | Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 21,725 8,955 10,304
Acquired loans recorded at fair value [Member] | Home Equity [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 21,638 8,896  
Acquired loans recorded at fair value [Member] | Home Equity [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 19 20  
Acquired loans recorded at fair value [Member] | Home Equity [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 68 32  
Acquired loans recorded at fair value [Member] | Home Equity [Member] | Loss [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2]   7  
Acquired loans recorded at fair value [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 199 122 176
Acquired loans recorded at fair value [Member] | Consumer [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 199 122  
Acquired loans with deteriorated credit [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 17,392 2,144 2,167
Acquired loans with deteriorated credit [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 2,869 371  
Acquired loans with deteriorated credit [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,074 1,084  
Acquired loans with deteriorated credit [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 13,449 689  
Acquired loans with deteriorated credit [Member] | Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,402 1,413 1,425
Acquired loans with deteriorated credit [Member] | Residential [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 159 153  
Acquired loans with deteriorated credit [Member] | Residential [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 567 571  
Acquired loans with deteriorated credit [Member] | Residential [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 676 689  
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 11,880 731 742
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 760 218  
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] | Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 507 513  
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 10,613    
Acquired loans with deteriorated credit [Member] | Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 2,670
Acquired loans with deteriorated credit [Member] | Construction [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 863    
Acquired loans with deteriorated credit [Member] | Construction [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 1,807    
Acquired loans with deteriorated credit [Member] | Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 986
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 633    
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] | Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [1] 353    
Acquired loans with deteriorated credit [Member] | Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 400
Acquired loans with deteriorated credit [Member] | Home Equity [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross [2] 400    
Acquired loans with deteriorated credit [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross 54
Acquired loans with deteriorated credit [Member] | Consumer [Member] | Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 54    
[1] Includes business lines of credit.
[2] Includes home equity lines of credit.