Loans, Delinquent Loans (Details) (USD $)	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	$ 4,278,000		$ 1,508,000
60-89 Days past due	2,946,000		3,438,000
Greater than 90 days	3,861,000		4,101,000
Non-accrual	26,454,000		17,587,000		17,201,000
Total past due	37,539,000		26,634,000
Current	1,819,453,000		1,718,194,000
Total loans	1,856,992,000		1,744,828,000		1,715,648,000
Commercial [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	1,357,000		0
60-89 Days past due	1,500,000		242,000
Greater than 90 days	107,000		817,000
Non-accrual	7,654,000	[1]	6,450,000	[1]	4,212,000	[1]
Total past due	10,618,000		7,509,000
Current	442,826,000		442,902,000
Total loans	453,444,000		450,411,000		461,679,000
Commercial mortgage [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	1,042,000		278,000
60-89 Days past due	0		1,763,000
Greater than 90 days	3,077,000		1,597,000
Non-accrual	8,894,000	[1]	3,672,000	[1]	3,848,000	[1]
Total past due	13,013,000		7,310,000
Current	601,397,000		602,177,000
Total loans	614,410,000		609,487,000		577,237,000
Construction [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	0		0
60-89 Days past due	0		825,000
Greater than 90 days	667,000		942,000
Non-accrual	8,886,000	[1]	4,949,000	[1]	2,321,000	[1]
Total past due	9,553,000		6,716,000
Current	254,173,000		239,895,000
Total loans	263,726,000		246,611,000		242,806,000
Direct lease financing [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	788,000		1,230,000
60-89 Days past due	1,026,000		606,000
Greater than 90 days	8,000		745,000
Non-accrual	0		0
Total past due	1,822,000		2,581,000
Current	144,906,000		127,101,000
Total loans	146,728,000		129,682,000		129,400,000
Residential mortgage [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	0		0
60-89 Days past due	0		0
Greater than 90 days	0		0
Non-accrual	93,000		1,264,000		5,260,000
Total past due	93,000		1,264,000
Current	97,496,000		94,846,000
Total loans	97,589,000		96,110,000		96,139,000
Consumer loans and others [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	1,091,000		0
60-89 Days past due	0		0
Greater than 90 days	2,000		0
Non-accrual	0		1,252,000
Total past due	1,093,000		1,252,000
Current	231,057,000		164,145,000
Total loans	232,150,000		165,397,000
Consumer - home equity [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	0		0
60-89 Days past due	420,000		2,000
Greater than 90 days	0		0
Non-accrual	927,000		0
Total past due	1,347,000		2,000
Current	42,930,000		43,642,000
Total loans	44,277,000		43,644,000
Consumer [Member]
Age Analysis of Past Due Loans [Abstract]
Non-accrual	927,000		1,252,000		1,560,000
Total loans	276,427,000		209,041,000		205,243,000
Unamortized loan costs [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	0		0
60-89 Days past due	0		0
Greater than 90 days	0		0
Non-accrual	0		0
Total past due	0		0
Current	4,668,000		3,486,000
Total loans	$ 4,668,000		$ 3,486,000		$ 3,144,000

[1] Included in the non-accrual loans as of September 30, 2012 are five troubled debt restructured loans. $725,000 in commercial mortgage, $2.3 million in commercial, and $2.6 million in construction.