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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.

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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