Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 20,189		$ 20,189		$ 26,160
Recorded investment with no allowance	9,415		9,415		10,896
Recorded investment with an allowance	9,866		9,866		11,076
Related allowance	1,017		1,017		2,141
Average recorded investment	20,192	$ 25,972	20,794	$ 26,696
Interest income recognized			242	230
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,065		8,065		13,160
Recorded investment with no allowance	2,009		2,009		3,015
Recorded investment with an allowance	5,148		5,148		5,957
Related allowance	784		784		1,904
Average recorded investment	7,874	11,731	8,210	12,039
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	12,124		12,124		13,000
Recorded investment with no allowance	7,406		7,406		7,881
Recorded investment with an allowance	4,718		4,718		5,119
Related allowance	233		233		237
Average recorded investment	12,318	14,241	12,584	14,657
Interest income recognized			242	230
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	6,586		6,586		7,888
Recorded investment with no allowance	3,270		3,270		4,786
Recorded investment with an allowance	3,173		3,173		2,992
Related allowance	259		259		317
Average recorded investment	7,279	8,845	7,525	8,403
Interest income recognized			87	102
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,352		3,352		4,013
Recorded investment with no allowance	1,066		1,066		1,957
Recorded investment with an allowance	2,143		2,143		1,946
Related allowance	114		114		166
Average recorded investment	3,870	3,914	3,940	3,103
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,234		3,234		3,875
Recorded investment with no allowance	2,204		2,204		2,829
Recorded investment with an allowance	1,030		1,030		1,046
Related allowance	145		145		151
Average recorded investment	3,409	4,931	3,585	5,300
Interest income recognized			87	102
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	6,124		6,124		6,737
Recorded investment with no allowance	2,413		2,413		2,532
Recorded investment with an allowance	3,154		3,154		3,556
Related allowance	165		165		185
Average recorded investment	5,539	7,124	5,584	7,523
Interest income recognized			100	85
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,271		1,271		1,801
Recorded investment with no allowance	547		547		959
Recorded investment with an allowance	167		167		193
Related allowance	90		90		117
Average recorded investment	670	2,058	696	2,308
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,853		4,853		4,936
Recorded investment with no allowance	1,866		1,866		1,573
Recorded investment with an allowance	2,987		2,987		3,363
Related allowance	75		75		68
Average recorded investment	4,869	5,066	4,888	5,215
Interest income recognized			100	85
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	425		425
Recorded investment with no allowance	345		345
Average recorded investment	115	164	57	161
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	425		425
Recorded investment with no allowance	345		345
Average recorded investment	115	164	57	161
Commercial Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance
Recorded investment with no allowance
Recorded investment with an allowance
Related allowance
Average recorded investment
Interest income recognized
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance					99
Recorded investment with no allowance					99
Average recorded investment	66	106	82	114
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance					99
Recorded investment with no allowance					99
Average recorded investment	66	106	82	114
Consumer Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance
Recorded investment with no allowance
Recorded investment with an allowance
Related allowance
Average recorded investment
Interest income recognized
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	7,054		7,054		11,436
Recorded investment with no allowance	3,387		3,387		3,479
Recorded investment with an allowance	3,539		3,539		4,528
Related allowance	593		593		1,639
Average recorded investment	7,193	9,733	7,546	10,495
Interest income recognized			55	43
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,017		3,017		7,247
Recorded investment with no allowance	51		51
Recorded investment with an allowance	2,838		2,838		3,818
Related allowance	580		580		1,621
Average recorded investment	3,153	5,489	3,435	6,353
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,037		4,037		4,189
Recorded investment with no allowance	3,336		3,336		3,479
Recorded investment with an allowance	701		701		710
Related allowance	13		13		$ 18
Average recorded investment	$ 4,040	$ 4,244	4,111	4,142
Interest income recognized			$ 55	$ 43