Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 20,923	$ 23,748
New TDRs	3,630	1,837
Disbursements (Payments)	(3,263)	(1,091)
Charge offs	(638)	(1,098)
Reclassifications/Transfer In/(Out)		(1,525)
Payoffs	(179)
TDR ending balance	20,473	21,871
TDR, Related Allowance	1,211	1,152
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	5,428	7,074
New TDRs	2,570
Disbursements (Payments)	(2,329)	(234)
Charge offs	(521)	(1,098)
Reclassifications/Transfer In/(Out)	2,053	(302)
TDR ending balance	7,201	5,440
TDR, Related Allowance	947	732
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	445	3,382
Disbursements (Payments)	(294)	(21)
Reclassifications/Transfer In/(Out)	1,595	(2,911)
TDR ending balance	1,746	450
TDR, Related Allowance	25	89
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		346
Disbursements (Payments)		(4)
Charge offs	(258)	(40)
Reclassifications/Transfer In/(Out)	458	(302)
TDR ending balance	200
TDR, Related Allowance	112
Impaired Nonaccrual Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	23	25
Disbursements (Payments)	(23)	(2)
TDR ending balance		23
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,960	3,321
New TDRs	2,570
Disbursements (Payments)	(2,012)	(207)
Charge offs	(263)	(1,058)
Reclassifications/Transfer In/(Out)		2,911
TDR ending balance	5,255	4,967
TDR, Related Allowance	810	643
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	15,495	16,674
New TDRs	1,060	1,837
Disbursements (Payments)	(934)	(857)
Charge offs	(117)
Reclassifications/Transfer In/(Out)	(2,053)	(1,223)
Payoffs	(179)
TDR ending balance	13,272	16,431
TDR, Related Allowance	264	420
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	5,686	6,368
New TDRs	565	1,837
Disbursements (Payments)	(375)	(206)
Reclassifications/Transfer In/(Out)	(1,595)	(1,324)
Payoffs	(179)
TDR ending balance	4,102	6,675
TDR, Related Allowance	154	207
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	5,740	6,237
New TDRs	495
Disbursements (Payments)	(689)	(562)
Charge offs	(117)
Reclassifications/Transfer In/(Out)	(458)
TDR ending balance	4,971	5,675
TDR, Related Allowance	89	180
Impaired Accruing Restructured Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		47
Disbursements (Payments)		(6)
Reclassifications/Transfer In/(Out)		(41)
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,069	4,022
Disbursements (Payments)	130	(83)
Reclassifications/Transfer In/(Out)		142
TDR ending balance	4,199	4,081
TDR, Related Allowance	$ 21	$ 33