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Loans and Allowance for Loan Losses (Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	$ 4,476	$ 9,280	$ 14,858
Unpaid principal balance with related allowance recorded	4,476	9,280	14,858
Average recorded investment with related allowance recorded	5,921	12,257	9,418
Interest income recognized with related allowance recorded	138	153	106
Recorded investment without related allowance recorded	2,450	4,310	5,396
Unpaid principal balance without related allowance recorded	3,001	6,216	7,756
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	5,368	4,709	6,970
Interest income recognized without related allowance recorded	55	62	76
Recorded investment, total impaired loans	6,926	13,590	20,254
Unpaid principal balance, total impaired loans	7,477	15,496	22,614
Related allowance, total impaired loans	824	2,009	2,007
Average recorded investment, total impaired loans	11,289	16,966	16,388
Interest income recognized, total impaired loans	193	215	182
Residential real estate loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	3,471	3,858	3,019
Unpaid principal balance with related allowance recorded	3,471	3,858	3,019
Average recorded investment with related allowance recorded	3,591	3,177	3,088
Interest income recognized with related allowance recorded	127	131	106
Recorded investment without related allowance recorded	1,291	1,313	1,329
Unpaid principal balance without related allowance recorded	1,415	1,673	1,800
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	1,524	1,345	2,057
Interest income recognized without related allowance recorded	34	15	9
Related allowance, total impaired loans	586	568	483
Commercial real estate loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	131	5,422	11,443
Unpaid principal balance with related allowance recorded	131	5,422	11,443
Average recorded investment with related allowance recorded	1,969	8,900	5,165
Interest income recognized with related allowance recorded	11	22
Recorded investment without related allowance recorded	799	777	1,874
Unpaid principal balance without related allowance recorded	975	1,084	2,369
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	2,269	1,132	2,214
Interest income recognized without related allowance recorded	13	29	51
Related allowance, total impaired loans	23	1,441	1,373
Commercial loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	556
Unpaid principal balance with related allowance recorded	556
Average recorded investment with related allowance recorded	111	31	762
Recorded investment without related allowance recorded	230	1,791	2,028
Unpaid principal balance without related allowance recorded	293	2,964	3,209
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	1,379	1,920	2,507
Interest income recognized without related allowance recorded	8	10	16
Related allowance, total impaired loans	53	0
Home equity loans
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded	318		299
Unpaid principal balance with related allowance recorded	318		299
Average recorded investment with related allowance recorded	250	125	305
Recorded investment without related allowance recorded	124	429	158
Unpaid principal balance without related allowance recorded	305	495	368
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	195	310	180
Interest income recognized without related allowance recorded		8
Related allowance, total impaired loans	162	0	86
Consumer loans
Financing Receivable, Impaired [Line Items]
Recorded investment without related allowance recorded	6		7
Unpaid principal balance without related allowance recorded	13		10
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded	1	2	12
Related allowance, total impaired loans	0	0
HPFC Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with related allowance recorded			97
Unpaid principal balance with related allowance recorded			97
Average recorded investment with related allowance recorded		24	98
Impaired Financing Receivable With No Related Allowance Related Allowance	0	0
Average recorded investment without related allowance recorded
Related allowance, total impaired loans	$ 0	$ 0	$ 65

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