Loans (Summary of Loan Modifications by Concession Type) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	112	98	142
Pre- modification recorded investment	$ 10,057	$ 20,819	$ 22,596
Post- modification recorded investment	9,656	20,819	22,594
Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	3,853	15,269	15,206
Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	37	3,393	450
A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	43	0
Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	2,637	364	900
Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 3,129	$ 1,750	$ 6,038
Commercial Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	53	70	77
Pre- modification recorded investment	$ 8,549	$ 19,712	$ 19,347
Post- modification recorded investment	8,343	19,712	19,347
Commercial Loan Portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	3,049	14,526	12,640
Commercial Loan Portfolio | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	3,393	450
Commercial Loan Portfolio | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	43	0
Commercial Loan Portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	2,165	0	219
Commercial Loan Portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 3,129	$ 1,750	$ 6,038
Commercial Loan Portfolio | Commercial
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	36	54	53
Pre- modification recorded investment	$ 6,416	$ 14,853	$ 11,446
Post- modification recorded investment	6,311	14,853	11,446
Commercial Loan Portfolio | Commercial | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	2,308	11,533	6,031
Commercial Loan Portfolio | Commercial | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	1,527	0
Commercial Loan Portfolio | Commercial | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	43	0
Commercial Loan Portfolio | Commercial | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	1,827	0	117
Commercial Loan Portfolio | Commercial | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 2,176	$ 1,750	$ 5,298
Commercial Loan Portfolio | Commercial real estate
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	16	16	21
Pre- modification recorded investment	$ 2,097	$ 4,859	$ 7,196
Post- modification recorded investment	1,997	4,859	7,196
Commercial Loan Portfolio | Commercial real estate | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	706	2,993	5,904
Commercial Loan Portfolio | Commercial real estate | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	1,866	450
Commercial Loan Portfolio | Commercial real estate | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	0	0
Commercial Loan Portfolio | Commercial real estate | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	338	0	102
Commercial Loan Portfolio | Commercial real estate | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 953	$ 0	$ 740
Commercial Loan Portfolio | Real estate construction and land development
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	1		3
Pre- modification recorded investment	$ 36		$ 705
Post- modification recorded investment	35		705
Commercial Loan Portfolio | Real estate construction and land development | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	35		705
Commercial Loan Portfolio | Real estate construction and land development | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0		0
Commercial Loan Portfolio | Real estate construction and land development | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0		0
Commercial Loan Portfolio | Real estate construction and land development | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0		0
Commercial Loan Portfolio | Real estate construction and land development | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 0		$ 0
Consumer Loan Portfolio
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	59	28	65
Pre- modification recorded investment	$ 1,508	$ 1,107	$ 3,249
Post- modification recorded investment	1,313	1,107	3,247
Consumer Loan Portfolio | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	804	743	2,566
Consumer Loan Portfolio | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	37	0	0
Consumer Loan Portfolio | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	0	0
Consumer Loan Portfolio | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	472	364	681
Consumer Loan Portfolio | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 0	$ 0	$ 0
Consumer Loan Portfolio | Residential mortgage
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	11	4	20
Pre- modification recorded investment	$ 763	$ 477	$ 1,881
Post- modification recorded investment	680	477	1,881
Consumer Loan Portfolio | Residential mortgage | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	297	477	1,246
Consumer Loan Portfolio | Residential mortgage | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	0	0
Consumer Loan Portfolio | Residential mortgage | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	0	0
Consumer Loan Portfolio | Residential mortgage | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	383	0	635
Consumer Loan Portfolio | Residential mortgage | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 0	$ 0	$ 0
Consumer Loan Portfolio | Consumer installment
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	34	14	19
Pre- modification recorded investment	$ 208	$ 87	$ 210
Post- modification recorded investment	192	87	210
Consumer Loan Portfolio | Consumer installment | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	118	87	210
Consumer Loan Portfolio | Consumer installment | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	37	0	0
Consumer Loan Portfolio | Consumer installment | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	0	0
Consumer Loan Portfolio | Consumer installment | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	37	0	0
Consumer Loan Portfolio | Consumer installment | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 0	$ 0	$ 0
Consumer Loan Portfolio | Home equity
Financing Receivable, Modifications [Line Items]
Total number of loans | loan	14	10	26
Pre- modification recorded investment	$ 537	$ 543	$ 1,158
Post- modification recorded investment	441	543	1,156
Consumer Loan Portfolio | Home equity | Principal deferral
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	389	179	1,110
Consumer Loan Portfolio | Home equity | Principal reduction
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	0	0
Consumer Loan Portfolio | Home equity | A/B Note Restructure
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	0	0	0
Consumer Loan Portfolio | Home equity | Interest rate
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	52	364	46
Consumer Loan Portfolio | Home equity | Forbearance agreement
Financing Receivable, Modifications [Line Items]
Post- modification recorded investment	$ 0	$ 0	$ 0