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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 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, Average Recorded Investment | 1,232,000 | $ 2,696,000 | $ 9,015,000
Impaired Financing Receivable, Interest Income, Cash Basis Method | 56,000 | $ 91,000 | 532,000
Mortgage Loans on Real Estate, Number of Foreclosures | loan |  | 1 |
Mortgage Loans on Real Estate, Foreclosures |  | $ 5,000,000 |
Foreclosed Real Estate Expense | 1,164,000 | 680,000 | 911,000
Acquired Loans with Specific Evidence of Deterioration in Credit Quality, Outstanding Balance | 1,444,000 | 1,821,000 |
Real Estate Acquired Through Foreclosure | 1,661,000 | 5,302,000 |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,247,000 | 2,624,000 |
Annual Loan Review threshold, amount | 1,500,000 |  |
Loans and Leases Receivable, Gross | 764,335,000 | 714,105,000 |
Charge Offs | 1,220,000 | 2,951,000 | 3,198,000
Proceeds from Sale of Mortgage Loans Held-for-sale |  | 1,739,000 | 4,410,000
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 163,000 | 163,000 | 515,000
Servicing Asset at Amortized Cost | 29,000,000 | 35,500,000 |
Customer Concentration Risk [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge Offs | 762,000 | 31,000 | 643,000
Commercial Rentals [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 68,100,000 |  |
Concentration Risk, Percentage | 63.60% |  |
Hospitality Lodging Industry [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 53,900,000 |  |
Concentration Risk, Percentage | 50.40% |  |
Troubled Debt Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 1,100,000 | 1,500,000 |
Impaired Financing Receivable, Related Allowance | $ 0 | $ 0 |
Mortgage Loans on Real Estate, Number of Foreclosures | loan | 1 | 1 |
Mortgage Loans on Real Estate, Foreclosures |  | $ 322,000 |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 55,000 | 2,600,000 |
Financing Receivable, Modifications, Recorded Investment |  | 82,000 |
Residential Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Related Allowance | 0 | 0 |
Impaired Financing Receivable, Average Recorded Investment | 23,000 | 25,000 | 159,000
Impaired Financing Receivable, Interest Income, Cash Basis Method | 0 | 0 | 4,000
Real Estate Acquired Through Foreclosure | $ 34,000 |  |
Number Of Properties Under Foreclosure Proceedings | loan | 15 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 1,166,000 |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 23,000 | 23,000 |
Loans and Leases Receivable, Gross | 235,759,000 | 237,177,000 |
Charge Offs | 83,000 | 123,000 | 224,000
Gross Realized Gains on Loans |  | 54,000 | 113,000
Gross Realized Losses on Loans |  | $ 0 | $ 0
Historical loss factor |  | 0.80% | 0.70%
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 1,209,000 | $ 2,671,000 | $ 8,847,000
Impaired Financing Receivable, Interest Income, Cash Basis Method | 56,000 | 91,000 | 526,000
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,224,000 | 2,601,000 |
Loans and Leases Receivable, Gross | 342,934,000 | 320,187,000 |
Charge Offs | 902,000 | 2,711,000 | 2,883,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) | 22,747,000 |  |
Allowance for Loan and Lease Losses, Adjustments, Other |  | 419,000 |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | (642,000) | (883,000) |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  |  | 1,596,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases |  |  | 1,610,000
Allowance for Loan and Lease Losses, Real Estate | $ 5,265,000 | $ 4,623,000 | $ 5,506,000
Historical loss factor | 0.74% | 0.80% |
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 | 1,247,000 | 2,624,000 |
Charge Offs | $ 277,000 | $ 831,000 |

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6873192&loc=d3e21338-158488 + Details
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- Definition Amount of increase (decrease) of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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- Definition Amount of reduction in the reserve for loans impairments as a result of current information and events which result in it being probable that estimated cash flows will be significantly higher than previously expected or because actual cash flows are significantly greater than cash flows previously expected for loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was 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 No definition available. + Details
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- Definition For loans and debt securities, 1) for which at acquisition it was probable that the investor would be unable to collect all contractually required payments receivable, and 2) for which it is further probable that the investor will not be able to collect all cash flows expected at acquisition (plus any additional cash flows expected due to changes in estimate after acquisition), the allowance for credit losses recorded to reflect the impairment since acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5275-111524 + Details
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