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Loans Receivable and Allowance for Loan Losses (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 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 |  |  |
Real Estate Acquired Through Foreclosure | 1,556,000 | 1,115,000 |
Annual Loan Review threshold, amount | 1,500,000 |  |
Loans and Leases Receivable, Gross | 924,676,000 | 850,302,000 |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease) | 417,000 | 86,100,000 |
Allowance for Loan and Lease Losses, Adjustments, Other | 447,000 |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) | 57,000 | 818,000 |
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 101,000 | 98,000 |
Allowance for Loan and Lease Losses, Real Estate | $ 8,509,000 | $ 8,452,000 | $ 7,634,000
Historical loss factor | 0.15% | 0.26% |
Servicing Asset at Amortized Cost | $ 28,500,000 | $ 26,800,000 |
Commercial Rentals [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 84,600,000 |  |
Concentration Risk, Percentage | 65.00% |  |
Hospitality Lodging Industry [Member] | Loans Receivable [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Gross | $ 64,600,000 |  |
Concentration Risk, Percentage | 49.60% |  |
Residential Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number Of Properties Under Foreclosure Proceedings | loan | 3 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 299,000 |  |
Loans and Leases Receivable, Gross | 229,781,000 | 235,523,000 |
Proceeds from Sale of Mortgage Loans Held-for-sale | 4,838,000 | 767,000 |
Gross Realized Gains on Loans | 123,000 | 15,000 |
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 |  |  |
Loans and Leases Receivable, Gross | 391,327,000 | $ 374,790,000 |
Historical loss factor |  | 0.26% | 0.41%
Troubled Debt Restructured Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 99,000 | $ 1,100,000 |
Impaired Financing Receivable, Related Allowance |  | $ 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 |  | $ 977,000 | $ 23,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 451,000 |  |

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118959141&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5275-111524 + Details
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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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