Loans and Allowance for Loan Losses (Loan Aging Analysis by Portfolio Segment (Including Loans Past Due Over Ninety Days and Non Accrual Loans) and Summary of Non Accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 – 59 Days Past Due	$ 4,275	$ 5,761
60 – 89 Days Past Due	783	3,366
Greater Than 90 Days	10,844	13,975
Total Past Due	15,902	23,102
Current	1,756,708	1,557,300
Total ending loans balance	1,772,610	1,580,402	1,563,866
Loans greater than 90 Days Past Due and Accruing		455
Non-Accrual Loans	16,639	22,477
Residential real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 – 59 Days Past Due	1,206	3,218
60 – 89 Days Past Due	426	684
Greater Than 90 Days	4,531	7,269
Total Past Due	6,163	11,171
Current	579,305	558,648
Total ending loans balance	585,468	569,819	572,173
Non-Accrual Loans	6,056	10,520
Commercial real estate loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 – 59 Days Past Due	1,696	926
60 – 89 Days Past Due		2,036
Greater Than 90 Days	3,791	3,301
Total Past Due	5,487	6,263
Current	635,174	534,836
Total ending loans balance	640,661	541,099	506,231
Loans greater than 90 Days Past Due and Accruing		257
Non-Accrual Loans	7,043	7,799
Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 – 59 Days Past Due	456	159
60 – 89 Days Past Due	269	237
Greater Than 90 Days	1,139	1,980
Total Past Due	1,864	2,376
Current	255,651	176,827
Total ending loans balance	257,515	179,203	190,454
Loans greater than 90 Days Past Due and Accruing		198
Non-Accrual Loans	1,529	2,146
Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 – 59 Days Past Due	889	1,395
60 – 89 Days Past Due	88	388
Greater Than 90 Days	1,129	1,007
Total Past Due	2,106	2,790
Current	269,603	269,840
Total ending loans balance	271,709	272,630	278,375
Non-Accrual Loans	1,740	1,571
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 – 59 Days Past Due	28	63
60 – 89 Days Past Due		21
Greater Than 90 Days	254	418
Total Past Due	282	502
Current	16,975	17,149
Total ending loans balance	17,257	17,651	16,633
Non-Accrual Loans	$ 271	$ 441