Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and leases receivable, no longer reported as related party	$ 1,400
Financing receivable, modifications, post-modification recorded investment	$ 3,650
Financing receivable, modifications, number of contracts \| contract	4
Financing receivable, recorded investment, nonaccrual status	$ 10,590	$ 16,655
Mortgage loans in process of foreclosure, amount	23	949
Loans and leases receivable, net amount, total	1,238,147	1,185,012
Loans	1,248,654	1,195,355
Financing receivable origination fee, net	1,800	789
Other real estate owned, net	$ 74	$ 1,222
Allowance from loan losses, as a percentage of total loans	0.84%	0.87%
Directors, Associates and Policy Making Officers [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and leases receivable, related parties	$ 18,800	$ 13,200
Loans and leases receivable, related parties, additions	15,700	1,900
Loans and leases receivable, related parties, proceeds	8,600	2,600
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, modifications, post-modification recorded investment	$ 2,119
Financing receivable, modifications, number of contracts \| contract	3
Financing receivable, recorded investment, nonaccrual status	$ 2,475	4,099
Loans	442,506	429,560
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	17,737	7,274
Northwest Bank Branches [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Net Of Discount	79,200	92,800
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable, Related Discount	1,100	1,400
Pass Performing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	1,042,408	967,331
Pass Performing [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	404,500	386,553
Pass Performing [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	17,347	6,805
Pass Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	177,994	194,540
Pass Watch [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	29,223	33,739
Pass Watch [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	383	466
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	13,523	8,926
Special Mention [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	5,549	3,769
Special Mention [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	2
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, recorded investment, nonaccrual status	10,600	16,700
Loans	14,729	24,558
Substandard [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	3,234	5,499
Substandard [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 5	$ 3

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Net Of Discount

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Financing receivable origination fee, net.

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The amount due from related parties which are no longer reported as related party loans due to changes in the composition of related parties.

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Number of financing receivables that have been modified by troubled debt restructurings.

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Amount, after troubled debt restructuring, of modified financing receivable.

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Amount of financing receivable on nonaccrual status.

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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.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.

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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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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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