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Loans and Allowance for Loan Losses (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,026,222	$ 2,782,439	$ 2,594,564
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,636,966	2,374,582
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	346,512	339,876
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	12,619	22,784
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	28,250	43,546
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	1,875	1,651
Residential real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	992,866	858,369	802,494
Residential real estate loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	983,086	846,394
Residential real estate loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	887	922
Residential real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	8,893	11,053
Commercial real estate loans
Financing Receivable, Recorded Investment [Line Items]
Loans	1,269,533	1,164,023	1,050,780
Commercial real estate loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,247,190	1,130,235
Commercial real estate loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,921	9,154
Commercial real estate loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	14,422	24,634
Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Loans	381,780	373,400	333,639
Commercial loans | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	374,429	354,904
Commercial loans | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,688	12,517
Commercial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	3,663	5,979
Home equity loans
Financing Receivable, Recorded Investment [Line Items]
Loans	327,763	323,378	329,907
Home equity loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	325,917	321,727
Home equity loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	1,846	1,651
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Loans	20,624	18,149	17,332
Consumer loans | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	20,595	18,149
Consumer loans | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans	29
HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	33,656	45,120	$ 60,412
HPFC Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	32,261	43,049
HPFC Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	123	191
HPFC Portfolio Segment [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,272	$ 1,880

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- Definition

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+ References

No definition available.

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- Definition

Amount before allowance and after 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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