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Loans Receivable and Allowance for Loan Losses (Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | $ 32,104 | $ 29,593 | $ 29,861 | $ 29,986 |
Average Recorded Investment - With an allowance recorded |  | 11,450 | 14,990 | 11,765 | 14,389 |
Interest Income Recognized - With no related allowance recorded |  | 715 | 233 | 1,435 | 466 |
Interest Income Recognized - With an allowance recorded |  | 108 | 135 | 216 | 267 |
Recorded Investment - With no related allowance recorded |  | 40,004 |  | 40,004 |  | $ 25,384
Recorded Investment - With an allowance recorded |  | 10,895 |  | 10,895 |  | 12,402
Recorded Investment - Total |  | 50,899 |  | 50,899 |  | 37,786
Unpaid Principal Balance - With no related allowance recorded |  | 60,229 |  | 60,229 |  | 27,733
Unpaid Principal Balance - With an allowance recorded |  | 11,486 |  | 11,486 |  | 13,438
Unpaid Principal Balance - Total |  | 71,715 |  | 71,715 |  | 41,171
Related Allowance |  | 2,038 |  | 2,038 |  | 2,033
Originated loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 15,654 | 17,582 | 15,551 | 17,625 |
Average Recorded Investment - With an allowance recorded |  | 6,508 | 10,576 | 6,880 | 10,139 |
Interest Income Recognized - With no related allowance recorded |  | 143 | 107 | 289 | 213 |
Interest Income Recognized - With an allowance recorded |  | 69 | 96 | 138 | 189 |
Recorded Investment - With no related allowance recorded |  | 16,345 |  | 16,345 |  | 15,351
Recorded Investment - With an allowance recorded |  | 6,125 |  | 6,125 |  | 7,627
Unpaid Principal Balance - With no related allowance recorded |  | 19,784 |  | 19,784 |  | 16,839
Unpaid Principal Balance - With an allowance recorded |  | 6,464 |  | 6,464 |  | 8,459
Related Allowance |  | 1,263 |  | 1,263 |  | 1,566
Originated loans [Member] | Residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 1,912 | 3,640 | 1,965 | 4,299 |
Average Recorded Investment - With an allowance recorded |  | 4,752 | 6,026 | 5,125 | 5,546 |
Interest Income Recognized - With no related allowance recorded |  | 7 | 24 | 15 | 49 |
Interest Income Recognized - With an allowance recorded |  | 47 | 48 | 95 | 96 |
Recorded Investment - With no related allowance recorded |  | 1,934 |  | 1,934 |  | 2,073
Recorded Investment - With an allowance recorded |  | 4,321 |  | 4,321 |  | 5,871
Unpaid Principal Balance - With no related allowance recorded |  | 1,975 |  | 1,975 |  | 2,236
Unpaid Principal Balance - With an allowance recorded |  | 4,321 |  | 4,321 |  | 5,871
Related Allowance |  | 252 |  | 252 |  | 508
Originated loans [Member] | Commercial and Multi-family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 11,973 | 12,365 | 12,052 | 11,287 |
Average Recorded Investment - With an allowance recorded |  | 485 | 839 | 323 | 1,267 |
Interest Income Recognized - With no related allowance recorded |  | 86 | 63 | 172 | 125 |
Interest Income Recognized - With an allowance recorded |  |  | 10 |  | 19 |
Recorded Investment - With no related allowance recorded |  | 12,363 |  | 12,363 |  | 12,212
Recorded Investment - With an allowance recorded |  | 485 |  | 485 |  |
Unpaid Principal Balance - With no related allowance recorded |  | 12,819 |  | 12,819 |  | 12,763
Unpaid Principal Balance - With an allowance recorded |  | 526 |  | 526 |  |
Related Allowance |  | 112 |  | 112 |  |
Originated loans [Member] | Commercial Business [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | [1] |  | 712 | 622 | 1,095 |
Average Recorded Investment - With an allowance recorded | [1] | 1,094 | 3,427 | 1,262 | 3,039 |
Interest Income Recognized - With no related allowance recorded | [1] | 43 | 11 | 87 | 21 |
Interest Income Recognized - With an allowance recorded | [1] | 20 | 35 | 40 | 69 |
Recorded Investment - With no related allowance recorded | [1] | 1,104 |  | 1,104 |  | 181
Recorded Investment - With an allowance recorded | [1] | 1,122 |  | 1,122 |  | 1,599
Unpaid Principal Balance - With no related allowance recorded | [1] | 3,991 |  | 3,991 |  | 908
Unpaid Principal Balance - With an allowance recorded | [1] | 1,420 |  | 1,420 |  | 2,431
Related Allowance | [1] | 834 |  | 834 |  | 1,033
Originated loans [Member] | Home Equity [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | [2] | 843 | 865 | 912 | 941 |
Average Recorded Investment - With an allowance recorded | [2] | 156 | 284 | 156 | 287 |
Interest Income Recognized - With no related allowance recorded | [2] | 7 | 9 | 15 | 18 |
Interest Income Recognized - With an allowance recorded | [2] | 2 | 3 | 3 | 5 |
Recorded Investment - With no related allowance recorded | [2] | 944 |  | 944 |  | 885
Recorded Investment - With an allowance recorded | [2] | 155 |  | 155 |  | 157
Unpaid Principal Balance - With no related allowance recorded | [2] | 999 |  | 999 |  | 932
Unpaid Principal Balance - With an allowance recorded | [2] | 155 |  | 155 |  | 157
Related Allowance | [2] | 23 |  | 23 |  | 25
Originated loans [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 926 |  |  | 3 |
Average Recorded Investment - With an allowance recorded |  | 21 |  | 14 |  |
Recorded Investment - With an allowance recorded |  | 42 |  | 42 |  |
Unpaid Principal Balance - With an allowance recorded |  | 42 |  | 42 |  |
Related Allowance |  | 42 |  | 42 |  |
Acquired loans recorded at fair value [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 7,269 | 10,061 | 7,548 | 10,406 |
Average Recorded Investment - With an allowance recorded |  | 4,572 | 4,414 | 4,639 | 4,250 |
Interest Income Recognized - With no related allowance recorded |  | 80 | 97 | 162 | 195 |
Interest Income Recognized - With an allowance recorded |  | 34 | 39 | 68 | 78 |
Recorded Investment - With no related allowance recorded |  | 6,846 |  | 6,846 |  | 8,107
Recorded Investment - With an allowance recorded |  | 4,401 |  | 4,401 |  | 4,775
Unpaid Principal Balance - With no related allowance recorded |  | 7,010 |  | 7,010 |  | 8,326
Unpaid Principal Balance - With an allowance recorded |  | 4,605 |  | 4,605 |  | 4,979
Related Allowance |  | 762 |  | 762 |  | 467
Acquired loans recorded at fair value [Member] | Residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 3,385 | 5,306 | 3,630 | 4,998 |
Average Recorded Investment - With an allowance recorded |  | 3,564 | 2,590 | 3,519 | 2,688 |
Interest Income Recognized - With no related allowance recorded |  | 23 | 35 | 46 | 71 |
Interest Income Recognized - With an allowance recorded |  | 28 | 21 | 56 | 43 |
Recorded Investment - With no related allowance recorded |  | 3,138 |  | 3,138 |  | 4,119
Recorded Investment - With an allowance recorded |  | 3,396 |  | 3,396 |  | 3,429
Unpaid Principal Balance - With no related allowance recorded |  | 3,302 |  | 3,302 |  | 4,285
Unpaid Principal Balance - With an allowance recorded |  | 3,547 |  | 3,547 |  | 3,580
Related Allowance |  | 463 |  | 463 |  | 281
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 3,639 | 4,127 | 3,683 | 4,845 |
Average Recorded Investment - With an allowance recorded |  | 923 | 1,718 | 1,035 | 1,249 |
Interest Income Recognized - With no related allowance recorded |  | 54 | 56 | 109 | 112 |
Interest Income Recognized - With an allowance recorded |  | 5 | 16 | 9 | 32 |
Recorded Investment - With no related allowance recorded |  | 3,464 |  | 3,464 |  | 3,772
Recorded Investment - With an allowance recorded |  | 920 |  | 920 |  | 1,260
Unpaid Principal Balance - With no related allowance recorded |  | 3,464 |  | 3,464 |  | 3,773
Unpaid Principal Balance - With an allowance recorded |  | 973 |  | 973 |  | 1,313
Related Allowance |  | 293 |  | 293 |  | 179
Acquired loans recorded at fair value [Member] | Home Equity [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | [2] | 245 | 628 | 235 | 563 |
Average Recorded Investment - With an allowance recorded | [2] | 85 | 106 | 85 | 313 |
Interest Income Recognized - With no related allowance recorded | [2] | 3 |  | 7 | 12 |
Interest Income Recognized - With an allowance recorded | [2] | 1 | 2 | 3 | 3 |
Recorded Investment - With no related allowance recorded | [2] | 244 |  | 244 |  | 216
Recorded Investment - With an allowance recorded | [2] | 85 |  | 85 |  | 86
Unpaid Principal Balance - With no related allowance recorded | [2] | 244 |  | 244 |  | 268
Unpaid Principal Balance - With an allowance recorded | [2] | 85 |  | 85 |  | 86
Related Allowance | [2] | 6 |  | 6 |  | 7
Acquired loans recorded at fair value [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Interest Income Recognized - With no related allowance recorded |  |  | 6 |  |  |
Acquired loans with deteriorated credit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 9,181 | 1,950 | 6,762 | 1,955 |
Average Recorded Investment - With an allowance recorded |  | 370 |  | 246 |  |
Interest Income Recognized - With no related allowance recorded |  | 492 | 29 | 984 | 58 |
Interest Income Recognized - With an allowance recorded |  | 5 |  | 10 |  |
Recorded Investment - With no related allowance recorded |  | 16,813 |  | 16,813 |  | 1,926
Recorded Investment - With an allowance recorded |  | 369 |  | 369 |  |
Unpaid Principal Balance - With no related allowance recorded |  | 33,435 |  | 33,435 |  | 2,568
Unpaid Principal Balance - With an allowance recorded |  | 417 |  | 417 |  |
Related Allowance |  | 13 |  | 13 |  |
Acquired loans with deteriorated credit [Member] | Residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 1,035 | 1,430 | 1,161 | 1,434 |
Average Recorded Investment - With an allowance recorded |  | 370 |  | 246 |  |
Interest Income Recognized - With no related allowance recorded |  | 16 | 22 | 33 | 44 |
Interest Income Recognized - With an allowance recorded |  | 5 |  | 10 |  |
Recorded Investment - With no related allowance recorded |  | 1,032 |  | 1,032 |  | 1,413
Recorded Investment - With an allowance recorded |  | 369 |  | 369 |  |
Unpaid Principal Balance - With no related allowance recorded |  | 1,595 |  | 1,595 |  | 2,031
Unpaid Principal Balance - With an allowance recorded |  | 417 |  | 417 |  |
Related Allowance |  | 13 |  | 13 |  |
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 6,091 | 520 | 4,231 | 521 |
Interest Income Recognized - With no related allowance recorded |  | 122 | $ 7 | 244 | $ 14 |
Recorded Investment - With no related allowance recorded |  | 11,671 |  | 11,671 |  | 513
Unpaid Principal Balance - With no related allowance recorded |  | 12,145 |  | 12,145 |  | $ 537
Acquired loans with deteriorated credit [Member] | Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 1,335 |  | 890 |  |
Interest Income Recognized - With no related allowance recorded |  | 213 |  | 426 |  |
Recorded Investment - With no related allowance recorded |  | 2,670 |  | 2,670 |  |
Unpaid Principal Balance - With no related allowance recorded |  | 11,886 |  | 11,886 |  |
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | [1] | 493 |  | 329 |  |
Interest Income Recognized - With no related allowance recorded | [1] | 135 |  | 270 |  |
Recorded Investment - With no related allowance recorded | [1] | 986 |  | 986 |  |
Unpaid Principal Balance - With no related allowance recorded | [1] | 7,355 |  | 7,355 |  |
Acquired loans with deteriorated credit [Member] | Home Equity [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | [2] | 200 |  | 133 |  |
Interest Income Recognized - With no related allowance recorded | [2] | 5 |  | 10 |  |
Recorded Investment - With no related allowance recorded | [2] | 400 |  | 400 |  |
Unpaid Principal Balance - With no related allowance recorded | [2] | 400 |  | 400 |  |
Acquired loans with deteriorated credit [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 27 |  | 18 |  |
Interest Income Recognized - With no related allowance recorded |  | 1 |  | 1 |  |
Recorded Investment - With no related allowance recorded |  | 54 |  | 54 |  |
Unpaid Principal Balance - With no related allowance recorded |  | $ 54 |  | $ 54 |  |
[1] | Includes business lines of credit.
[2] | Includes home equity lines of credit.

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