Loans, Allowance for Loan and Lease Losses (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	$ 29,568	$ 24,063	$ 24,063
Charge-offs	(13,270)	(13,065)	(16,094)
Recoveries	1,726	19	101
Provision	15,047	16,654	21,498
Ending balance	33,071	27,671	29,568
Ending balance: Individually evaluated for impairment	10,882	3,850	5,936
Ending balance: Collectively evaluated for impairment	22,189	23,821	23,632
Loans
Loans, net of deferred loan costs	1,856,992	1,715,648	1,744,828
Ending balance: Individually evaluated for impairment	29,160	17,201	17,587
Ending balance: Collectively evaluated for impairment	1,827,832	1,698,447	1,727,241
Loans acquired with deteriorated credit quality	0		0
Commercial [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	10,214	6,051	6,051
Charge-offs	(3,487)	(6,729)	(7,453)
Recoveries	505	2	2
Provision	1,843	11,034	11,614
Ending balance	9,075	10,358	10,214
Ending balance: Individually evaluated for impairment	1,884	1,127	2,724
Ending balance: Collectively evaluated for impairment	7,191	9,231	7,490
Loans
Loans, net of deferred loan costs	453,444	461,679	450,411
Ending balance: Individually evaluated for impairment	7,654	4,212	6,450
Ending balance: Collectively evaluated for impairment	445,790	457,467	443,961
Commercial mortgage [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	9,274	9,501	9,501
Charge-offs	(2,466)	(642)	(1,198)
Recoveries	1,028	14	89
Provision	476	(1,108)	882
Ending balance	8,312	7,765	9,274
Ending balance: Individually evaluated for impairment	4,028	615	712
Ending balance: Collectively evaluated for impairment	4,284	7,150	8,562
Loans
Loans, net of deferred loan costs	614,410	577,237	609,487
Ending balance: Individually evaluated for impairment	11,324	3,848	3,672
Ending balance: Collectively evaluated for impairment	603,086	573,389	605,815
Construction [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	5,352	5,030	5,030
Charge-offs	(6,931)	(3,003)	(3,254)
Recoveries	95	3	4
Provision	12,544	2,061	3,572
Ending balance	11,060	4,091	5,352
Ending balance: Individually evaluated for impairment	4,899	622	2,296
Ending balance: Collectively evaluated for impairment	6,161	3,469	3,056
Loans
Loans, net of deferred loan costs	263,726	242,806	246,611
Ending balance: Individually evaluated for impairment	9,162	2,321	4,949
Ending balance: Collectively evaluated for impairment	254,564	240,485	241,662
Direct lease financing [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	254	164	164
Charge-offs	(87)	0	(39)
Recoveries	13	0	0
Provision	(25)	(36)	129
Ending balance	155	128	254
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: Collectively evaluated for impairment	155	128	254
Loans
Loans, net of deferred loan costs	146,728	129,400	129,682
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: Collectively evaluated for impairment	146,728	129,400	129,682
Residential mortgage [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	2,090	2,115	2,115
Charge-offs	0	(1,876)	(2,870)
Recoveries	85	0	0
Provision	81	2,636	2,845
Ending balance	2,256	2,875	2,090
Ending balance: Individually evaluated for impairment	71	1,037	0
Ending balance: Collectively evaluated for impairment	2,185	1,838	2,090
Loans
Loans, net of deferred loan costs	97,589	96,139	96,110
Ending balance: Individually evaluated for impairment	93	5,260	1,264
Ending balance: Collectively evaluated for impairment	97,496	90,879	94,846
Consumer loans and others [Member]
Loans
Loans, net of deferred loan costs	232,150		165,397
Consumer [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	1,346	578	578
Charge-offs	(299)	(815)	(1,280)
Recoveries	0	0	6
Provision	626	1,688	2,042
Ending balance	1,673	1,451	1,346
Ending balance: Individually evaluated for impairment	0	449	204
Ending balance: Collectively evaluated for impairment	1,673	1,002	1,142
Loans
Loans, net of deferred loan costs	276,427	205,243	209,041
Ending balance: Individually evaluated for impairment	927	1,560	1,252
Ending balance: Collectively evaluated for impairment	275,500	203,683	207,789
Unallocated [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	1,038	624	624
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(498)	379	414
Ending balance	540	1,003	1,038
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: Collectively evaluated for impairment	540	1,003	1,038
Loans
Loans, net of deferred loan costs	4,668	3,144	3,486
Ending balance: Individually evaluated for impairment	0	0	0
Ending balance: Collectively evaluated for impairment	$ 4,668	$ 3,144	$ 3,486