Loans, Delinquent Loans (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	$ 2,568	$ 1,508
60-89 Days past due	8,419	3,438
Greater than 90 days	3,105	4,101
Non-accrual	24,815	17,587
Total past due	38,907	26,634
Current	1,765,405	1,718,194
Total loans	1,804,312	1,744,828	1,678,660
Commercial [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	670	0
60-89 Days past due	0	242
Greater than 90 days	540	817
Non-accrual	9,536	6,450
Total past due	10,746	7,509
Current	430,421	442,902
Total loans	441,167	450,411	450,916
Commercial mortgage [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	0	278
60-89 Days past due	5,628	1,763
Greater than 90 days	1,632	1,597
Non-accrual	5,559	3,672
Total past due	12,819	7,310
Current	583,820	602,177
Total loans	596,639	609,487	593,842
Construction [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	1,823	0
60-89 Days past due	2,690	825
Greater than 90 days	667	942
Non-accrual	8,698	4,949
Total past due	13,878	6,716
Current	255,758	239,895
Total loans	269,636	246,611	205,730
Direct lease financing [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	0	1,230
60-89 Days past due	99	606
Greater than 90 days	266	745
Non-accrual	0	0
Total past due	365	2,581
Current	139,647	127,101
Total loans	140,012	129,682	127,016
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	95	1,264
Total past due	95	1,264
Current	97,131	94,846
Total loans	97,226	96,110	98,113
Consumer loans and others [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	75	0
60-89 Days past due	2	0
Greater than 90 days	0	0
Non-accrual	0	1,252
Total past due	77	1,252
Current	211,415	164,145
Total loans	211,492	165,397
Consumer - home equity [Member]
Age Analysis of Past Due Loans [Abstract]
30-59 Days past due	0	0
60-89 Days past due	0	2
Greater than 90 days	0	0
Non-accrual	927	0
Total past due	927	2
Current	43,350	43,642
Total loans	44,277	43,644
Consumer [Member]
Age Analysis of Past Due Loans [Abstract]
Total loans	255,769	209,041	200,132
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	3,863	3,486
Total loans	$ 3,863	$ 3,486	$ 2,911