Allowance for Loan Losses, Nonperforming Assets and Impaired Loans, Financing Receivable, Impaired (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Investment in impaired loans and related allowance [Abstract]
Principal Balance	$ 17,258		$ 12,987		$ 18,456
(A) Total Recorded Investment	17,222	[1]			18,422	[2]
Recorded Investment in (A) for Which There is No Related Allowance	16,226	[1]			16,940	[2]
Recorded Investment in (A) for Which There is a Related Allowance	996	[1]			1,482	[2]
Related Allowance	273		593		554
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	17,935	[1],[3]	14,555	[3]	13,540	[1],[3]
Interest Income Recognized	10		24		9
Real Estate Construction [Member] | Construction, Residential [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	123				123
(A) Total Recorded Investment	118	[1]			118	[2]
Recorded Investment in (A) for Which There is No Related Allowance	118	[1]			118	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	118	[1]			1,171	[1]
Interest Income Recognized	0				0
Real Estate Construction [Member] | Construction, Other [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	6,369				6,520
(A) Total Recorded Investment	6,334	[1]			6,487	[2]
Recorded Investment in (A) for Which There is No Related Allowance	6,334	[1]			6,487	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	6,486	[1]			4,290	[1]
Interest Income Recognized	0				1
Consumer Real Estate [Member] | Equity Lines [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	0				0
(A) Total Recorded Investment	0	[1]			0	[2]
Recorded Investment in (A) for Which There is No Related Allowance	0	[1]			0	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	0	[1]			101	[1]
Interest Income Recognized	0				0
Consumer Real Estate [Member] | Residential Closed end First Liens [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	315				783
(A) Total Recorded Investment	315	[1]			785	[2]
Recorded Investment in (A) for Which There is No Related Allowance	315	[1]			634	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			151	[2]
Related Allowance	0				43
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	392	[1]			873	[1]
Interest Income Recognized	0				2
Consumer Real Estate [Member] | Residential Closed end Junior Liens [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	80				81
(A) Total Recorded Investment	80	[1]			81	[2]
Recorded Investment in (A) for Which There is No Related Allowance	80	[1]			81	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	142	[1]			234	[1]
Interest Income Recognized	0				0
Consumer Real Estate [Member] | Investor-owned residential real estate [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	83
(A) Total Recorded Investment	84	[1]
Recorded Investment in (A) for Which There is No Related Allowance	84	[1]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]
Related Allowance	0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	84	[1]
Interest Income Recognized	0
Commercial Real Estate [Member] | Multifamily Real Estate [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	4,421				5,284
(A) Total Recorded Investment	4,417	[1]			5,288	[2]
Recorded Investment in (A) for Which There is No Related Allowance	4,417	[1]			5,288	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	4,540	[1]			1,466	[1]
Interest Income Recognized	0				5
Commercial Real Estate [Member] | Commercial Real Estate, Owner Occupied [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	5,506				5,045
(A) Total Recorded Investment	5,513	[1]			5,043	[2]
Recorded Investment in (A) for Which There is No Related Allowance	4,587	[1]			4,293	[2]
Recorded Investment in (A) for Which There is a Related Allowance	926	[1]			750	[2]
Related Allowance	269				273
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	5,599	[1]			4,806	[1]
Interest Income Recognized	10				1
Commercial Real Estate [Member] | Commercial Real Estate, Other [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	0				0
(A) Total Recorded Investment	0	[1]			0	[2]
Recorded Investment in (A) for Which There is No Related Allowance	0	[1]			0	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	0	[1]			0	[1]
Interest Income Recognized	0				0
Commercial Non Real Estate [Member] | Commercial and Industrial [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	318				574
(A) Total Recorded Investment	318	[1]			574	[2]
Recorded Investment in (A) for Which There is No Related Allowance	291	[1]			39	[2]
Recorded Investment in (A) for Which There is a Related Allowance	27	[1]			535	[2]
Related Allowance	1				231
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	574	[1]			570	[1]
Interest Income Recognized	0				0
Public Sector and IDA [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	0				0
(A) Total Recorded Investment	0	[1]			0	[2]
Recorded Investment in (A) for Which There is No Related Allowance	0	[1]			0	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	0	[1]			0	[1]
Interest Income Recognized	0				0
Consumer Non Real Estate [Member] | Credit Cards [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	0				0
(A) Total Recorded Investment	0	[1]			0	[2]
Recorded Investment in (A) for Which There is No Related Allowance	0	[1]			0	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	0	[1]			0	[1]
Interest Income Recognized	0				0
Consumer Non Real Estate [Member] | Automobile [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	43				46
(A) Total Recorded Investment	43	[1]			46	[2]
Recorded Investment in (A) for Which There is No Related Allowance	0	[1]			0	[2]
Recorded Investment in (A) for Which There is a Related Allowance	43	[1]			46	[2]
Related Allowance	3				7
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	0	[1]			4	[1]
Interest Income Recognized	0				0
Consumer Non Real Estate [Member] | Other Consumer [Member]
Investment in impaired loans and related allowance [Abstract]
Principal Balance	0				0
(A) Total Recorded Investment	0	[1]			0	[2]
Recorded Investment in (A) for Which There is No Related Allowance	0	[1]			0	[2]
Recorded Investment in (A) for Which There is a Related Allowance	0	[1]			0	[2]
Related Allowance	0				0
Impaired financing receivable average recorded investment and interest income recognized [Abstract]
Average Recorded Investment	0	[1]			25	[1]
Interest Income Recognized	$ 0				$ 0

[1] Recorded investment includes the unpaid principal balance and any accrued interest and net deferred fees.

[2] Recorded investment includes the unpaid principal balance, accrued interest and any accrued interest and deferred fees.

[3] Recorded investment includes principal, accrued interest and net deferred fees.