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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment | $ 0 |  |
Impaired Financing Receivable, Related Allowance |  |  |
Impaired Financing Receivable, Average Recorded Investment | 1,220,000 | 1,232,000 | $ 0
Impaired Financing Receivable, Interest Income, Cash Basis Method | 67,000 | 56,000 | 0
Foreclosed Real Estate Expense | 172,000 | 1,164,000 |
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance | 1,055,000 | 1,444,000 |
Real Estate Acquired Through Foreclosure | 1,115,000 | 1,661,000 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,319,000 | 1,247,000 |
Annual Loan Review threshold, amount | 1,500,000 |  |
Loans and Leases Receivable, Gross | 850,302,000 | 764,335,000 |
Charge Offs | 989,000 | 1,220,000 |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) | 86,100,000 |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 818,000 |  |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 98,000 | 163,000 |
Allowance for Loan and Lease Losses, Real Estate | $ 8,452,000 | $ 7,634,000 |
Historical loss factor | 0.26% | 0.41% |
Servicing Asset at Amortized Cost | $ 26,800,000 | $ 29,000,000 |
Mortgage loans originated for sale | 752,000 | 0 |
Customer Concentration Risk [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge Offs | 0 | 762,000 |
Commercial Rentals [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 71,800,000 |  |
Concentration Risk, Percentage | 68.90% |  |
Hospitality Lodging Industry [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 59,700,000 |  |
Concentration Risk, Percentage | 57.30% |  |
Residential Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance |  |  |
Impaired Financing Receivable, Average Recorded Investment |  | 23,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  |  |
Real Estate Acquired Through Foreclosure | $ 36,000 |  |
Number Of Properties Under Foreclosure Proceedings | loan | 3 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 298,000 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  | 23,000 |
Loans and Leases Receivable, Gross | 235,523,000 | 235,759,000 |
Charge Offs | 197,000 | 83,000 |
Proceeds from Sale of Mortgage Loans Held-for-sale | 767,000,000 | 0 |
Gross Realized Gains on Loans | 15,000 | 0 |
Gross Realized Losses on Loans | 0 | 0 |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance |  |  |
Impaired Financing Receivable, Average Recorded Investment | 1,220,000 | 1,209,000 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method | 67,000 | 56,000 | 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,319,000 | 1,224,000 |
Loans and Leases Receivable, Gross | 374,790,000 | 342,934,000 |
Charge Offs | 283,000 | 902,000 |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) |  | 22,747,000 |
Allowance for Loan and Lease Losses, Period Increase (Decrease) |  | 642,000 |
Allowance for Loan and Lease Losses, Real Estate |  | $ 5,265,000 | $ 4,623,000
Historical loss factor |  | 0.74% | 0.80%
Troubled Debt Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 1,100,000 | $ 1,100,000 |
Impaired Financing Receivable, Related Allowance | $ 0 | $ 0 |
New Loans Identified as Troubled Debt Restructurings, Number of Loans | loan | 0 | 0 |
Mortgage Loans on Real Estate, Number of Foreclosures | loan | 1 | 1 |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure |  | $ 23,000 | $ 322,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 0 | 55,000 |
Impaired Loans Requiring Allowance [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 | 0 |
Impaired Loans Not Requiring Allowance [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,319,000 | 1,247,000 |
Charge Offs | $ 428,000 | $ 277,000 |

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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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