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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) property loan | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 885,000 | $ 1,242,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 | 14,000 |
Foreclosed Real Estate Expense | 23,000 | (19,000) |
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance | 985,000 |  | $ 1,055,000
Real Estate Acquired Through Foreclosure | 1,792,000 |  | 1,115,000
Real Estate Acquired Through Deed-in-lieu, During Period | $ 680,000 |  |
Number Of Properties Acquired Through Foreclosure | property | 1 |  |
Number Of Properties Acquired Through Deed-in-lieu | property | 3 |  |
Loans and Leases Receivable, Gross | $ 864,314,000 |  | $ 850,302,000
Charge Offs | $ 598,000 | 99,000 |
Historical loss factor | 0.22% |  | 0.42%
Mortgage loans originated for sale | $ 732,000 | 0 |
Proceeds from Sale of Foreclosed Assets | 44,000 | 412,000 |
Multiple Properties [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Real Estate Acquired Through Foreclosure | $ 36,000 |  |
Number Of Properties Disposed By Sale | property | 1 |  |
Commercial Rentals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 73,400,000 |  |
Commercial Rentals [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 8.50% |  |
Hospitality Lodging Industry [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 59,100,000 |  |
Hospitality Lodging Industry [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 6.80% |  |
Residential Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 0 | 23,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | $ 0 | 0 |
Number Of Properties Under Foreclosure Proceedings | property | 2 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 221,000 |  |
Loans and Leases Receivable, Gross | 231,954,000 |  | $ 235,523,000
Charge Offs | 65,000 | 51,000 |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 885,000 | 1,219,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 | 14,000 |
Real Estate Acquired Through Foreclosure | 32,000 |  |
Loans and Leases Receivable, Gross | 373,276,000 |  | 374,790,000
Charge Offs | 469,000 | $ 0 |
Troubled Debt Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | $ 0 |  | 0
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan | 0 |  |
Real Estate Acquired Through Foreclosure | $ 608,000 |  |
Financing Receivable, Modifications, Recorded Investment | 107,000,000,000 |  | $ 1,100,000
Proceeds from Sale of Foreclosed Assets | 451,000 |  |
Delaware Bancshares, Inc. Acquisition [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance | 1,397,000 |  |
Assets, Fair Value Adjustment | 499,000 |  |
Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Annual Loan Review threshold, amount | $ 1,500,000 |  |

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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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