Loans Receivable and Allowance for Loan Losses (Narrative) (Details)	12 Months Ended
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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Gross Realized Gains on Loans

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Historical loss factor used to determine the allowance for loan and lease losses.

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The number of new loans identified as troubled debt restructurings during the period.

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Number Of Properties Under Foreclosure Proceedings

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Amount of increase (decrease) of allowance reserve for credit loss.

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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.

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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.

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Amount of expense recognized during the period for the foreclosure on real estate assets.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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