Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 26,112		$ 26,160
Recorded investment with no allowance	11,361		10,896
Recorded investment with an allowance	10,150		11,076
Related allowance	1,148		2,141
Average recorded investment	21,399	$ 27,419
Interest income recognized	130	126
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	13,330		13,160
Recorded investment with no allowance	3,345		3,015
Recorded investment with an allowance	5,384		5,957
Related allowance	899		1,904
Average recorded investment	8,547	12,346
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	12,782		13,000
Recorded investment with no allowance	8,016		7,881
Recorded investment with an allowance	4,766		5,119
Related allowance	249		237
Average recorded investment	12,852	15,073
Interest income recognized	130	126
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,195		7,888
Recorded investment with no allowance	5,354		4,786
Recorded investment with an allowance	2,620		2,992
Related allowance	282		317
Average recorded investment	7,772	7,961
Interest income recognized	43	55
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,491		4,013
Recorded investment with no allowance	2,689		1,957
Recorded investment with an allowance	1,581		1,946
Related allowance	134		166
Average recorded investment	4,010	2,292
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,704		3,875
Recorded investment with no allowance	2,665		2,829
Recorded investment with an allowance	1,039		1,046
Related allowance	148		151
Average recorded investment	3,762	5,669
Interest income recognized	43	55
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	6,112		6,737
Recorded investment with no allowance	2,358		2,532
Recorded investment with an allowance	3,197		3,556
Related allowance	183		185
Average recorded investment	5,629	7,922
Interest income recognized	57	46
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,213		1,801
Recorded investment with no allowance	481		959
Recorded investment with an allowance	175		193
Related allowance	99		117
Average recorded investment	721	2,559
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,899		4,936
Recorded investment with no allowance	1,877		1,573
Recorded investment with an allowance	3,022		3,363
Related allowance	84		68
Average recorded investment	4,908	5,363
Interest income recognized	57	46
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment		158
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Average recorded investment		158
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		99
Recorded investment with no allowance	99		99
Average recorded investment	99	121
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	99		99
Recorded investment with no allowance	99		99
Average recorded investment	99	121
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	11,706		11,436
Recorded investment with no allowance	3,550		3,479
Recorded investment with an allowance	4,333		4,528
Related allowance	683		1,639
Average recorded investment	7,899	11,257
Interest income recognized	30	25
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	7,527		7,247
Recorded investment with no allowance	76
Recorded investment with an allowance	3,628		3,818
Related allowance	666		1,621
Average recorded investment	3,717	7,216
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	4,179		4,189
Recorded investment with no allowance	3,474		3,479
Recorded investment with an allowance	705		710
Related allowance	17		$ 18
Average recorded investment	4,182	4,041
Interest income recognized	$ 30	$ 25