Loans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012		Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Major classifications of loans [Abstract]
Total loans, gross	$ 1,800,449,000		$ 1,800,449,000		$ 1,741,342,000
Unamortized loan costs	3,863,000		3,863,000		3,486,000
Total loans, net of deferred loan costs	1,804,312,000		1,804,312,000		1,744,828,000		1,678,660,000
Supplemental loan data
Total supplemental loans	1,800,449,000		1,800,449,000		1,741,342,000
Number of loans identified as impaired			31
Balance of impaired loans	27,500,000		27,500,000		17,600,000
Balance of impaired loans related to specific reserve	18,900,000		18,900,000		14,500,000
Specific reserve	7,000,000		7,000,000		5,900,000
Balance of impaired loans without specific reserve	8,600,000		8,600,000
Troubled debt restructured loans, specific reserve	3,300,000		3,300,000
Interest income lost on impaired loans	521,000
Interest income on impaired loans			43,000
Commercial [Member]
Major classifications of loans [Abstract]
Total loans, gross	441,167,000		441,167,000		450,411,000
Total loans, net of deferred loan costs	441,167,000		441,167,000		450,411,000		450,916,000
Supplemental loan data
Total supplemental loans	441,167,000		441,167,000		450,411,000
Balance of impaired loans	9,536,000		9,536,000		6,450,000
Balance of impaired loans related to specific reserve	7,847,000		7,847,000		5,550,000
Specific reserve	2,739,000		2,739,000		2,724,000
Balance of impaired loans without specific reserve	1,689,000		1,689,000		900,000
Commercial mortgage [Member]
Major classifications of loans [Abstract]
Total loans, gross	596,639,000	[1]	596,639,000	[1]	609,487,000	[1]
Total loans, net of deferred loan costs	596,639,000		596,639,000		609,487,000		593,842,000
Supplemental loan data
Total supplemental loans	596,639,000	[1]	596,639,000	[1]	609,487,000	[1]
Amount of owner occupied loans	141,900,000		141,900,000		137,900,000
Percentage of owner occupied loans (in hundredths)	23.80%		23.80%		22.60%
Balance of impaired loans	7,990,000		7,990,000		3,672,000
Balance of impaired loans related to specific reserve	4,508,000		4,508,000		3,672,000
Specific reserve	902,000		902,000		712,000
Balance of impaired loans without specific reserve	3,482,000		3,482,000		0
Construction [Member]
Major classifications of loans [Abstract]
Total loans, gross	269,636,000		269,636,000		246,611,000
Total loans, net of deferred loan costs	269,636,000		269,636,000		246,611,000		205,730,000
Supplemental loan data
Total supplemental loans	269,636,000		269,636,000		246,611,000
Balance of impaired loans	8,974,000		8,974,000		4,949,000
Balance of impaired loans related to specific reserve	6,433,000		6,433,000		4,949,000
Specific reserve	3,303,000		3,303,000		2,296,000
Balance of impaired loans without specific reserve	2,541,000		2,541,000		0
Total commercial loans [Member]
Major classifications of loans [Abstract]
Total loans, gross	1,307,442,000		1,307,442,000		1,306,509,000
Supplemental loan data
Total supplemental loans	1,307,442,000		1,307,442,000		1,306,509,000
Direct lease financing [Member]
Major classifications of loans [Abstract]
Total loans, gross	140,012,000		140,012,000		129,682,000
Total loans, net of deferred loan costs	140,012,000		140,012,000		129,682,000		127,016,000
Supplemental loan data
Total supplemental loans	140,012,000		140,012,000		129,682,000
Residential mortgage [Member]
Major classifications of loans [Abstract]
Total loans, gross	97,226,000		97,226,000		96,110,000
Total loans, net of deferred loan costs	97,226,000		97,226,000		96,110,000		98,113,000
Supplemental loan data
Total supplemental loans	97,226,000		97,226,000		96,110,000
Balance of impaired loans	95,000		95,000		1,264,000
Balance of impaired loans related to specific reserve	95,000		95,000		0
Specific reserve	73,000		73,000		0
Balance of impaired loans without specific reserve	0		0		1,264,000
Consumer loans and others [Member]
Major classifications of loans [Abstract]
Total loans, net of deferred loan costs	211,492,000		211,492,000		165,397,000
Consumer Loans [Member]
Major classifications of loans [Abstract]
Total loans, gross	255,769,000		255,769,000		209,041,000
Supplemental loan data
Total supplemental loans	255,769,000		255,769,000		209,041,000
Construction 1-4 family [Member]
Major classifications of loans [Abstract]
Total loans, gross	79,546,000		79,546,000		85,189,000
Supplemental loan data
Total supplemental loans	79,546,000		79,546,000		85,189,000
Commercial construction, acquisition and development [Member]
Major classifications of loans [Abstract]
Total loans, gross	190,090,000		190,090,000		161,422,000
Supplemental loan data
Total supplemental loans	$ 190,090,000		$ 190,090,000		$ 161,422,000

[1] At June 30, 2012, our owner occupied loans amounted to $141.9 million, or 23. 8% of commercial mortgages as compared to $137.9 million, or 22.6% at December 31, 2011.