Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	$ 80,569	$ 77,779	$ 84,767
Unpaid principal, with no related allowance recorded	101,922	96,208	103,953
Average recorded Investment, with no related allowance recorded	84,963	76,928	80,421
Interest income Recognized, with no related allowance recorded	1,332	1,643	2,801
Recorded investment, with an allowance recorded	24,148	30,998	29,788
Unpaid principal, with an allowance recorded	27,922	37,603	36,833
Related allowance, with an allowance recorded	5,241	5,082	5,993
Average recorded Investment, with an allowance recorded	23,957	26,835	27,009
Interest income Recognized, with an allowance recorded	652	830	1,201
PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	3,089		286
Unpaid principal, with no related allowance recorded	5,151		313
Average recorded Investment, with no related allowance recorded	2,479		144
Interest income Recognized, with no related allowance recorded	141		10
Recorded investment, with an allowance recorded	1,168
Unpaid principal, with an allowance recorded	1,188
Related allowance, with an allowance recorded	518
Average recorded Investment, with an allowance recorded	401
Interest income Recognized, with an allowance recorded	38
RE Mortgage [Member] | Residential [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	5,971	6,159	6,921
Unpaid principal, with no related allowance recorded	8,638	8,036	8,663
Average recorded Investment, with no related allowance recorded	6,857	6,176	6,557
Interest income Recognized, with no related allowance recorded	41	23	58
Recorded investment, with an allowance recorded	2,895	3,676	3,246
Unpaid principal, with an allowance recorded	3,401	4,116	3,760
Related allowance, with an allowance recorded	610	920	460
Average recorded Investment, with an allowance recorded	2,934	4,826	4,611
Interest income Recognized, with an allowance recorded	77	55	77
RE Mortgage [Member] | Residential [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	63
Unpaid principal, with no related allowance recorded	63
Average recorded Investment, with no related allowance recorded	11
Interest income Recognized, with no related allowance recorded	3
Recorded investment, with an allowance recorded	356
Unpaid principal, with an allowance recorded	359
Related allowance, with an allowance recorded	184
Average recorded Investment, with an allowance recorded	192
Interest income Recognized, with an allowance recorded	10
RE Mortgage [Member] | Commercial [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	58,397	49,227	61,205
Unpaid principal, with no related allowance recorded	67,181	57,010	72,408
Average recorded Investment, with no related allowance recorded	60,994	47,357	53,346
Interest income Recognized, with no related allowance recorded	1,178	1,132	2,235
Recorded investment, with an allowance recorded	7,428	19,121	10,688
Unpaid principal, with an allowance recorded	8,482	22,301	11,094
Related allowance, with an allowance recorded	1,068	1,329	1,613
Average recorded Investment, with an allowance recorded	6,755	13,456	10,019
Interest income Recognized, with an allowance recorded	145	663	588
RE Mortgage [Member] | Commercial [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	2,739
Unpaid principal, with no related allowance recorded	4,769
Average recorded Investment, with no related allowance recorded	2,095
Interest income Recognized, with no related allowance recorded	130
Recorded investment, with an allowance recorded	323
Unpaid principal, with an allowance recorded	334
Related allowance, with an allowance recorded	165
Average recorded Investment, with an allowance recorded	54
Interest income Recognized, with an allowance recorded	10
Home Equity Lines of Credit [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	4,262	3,753	5,101
Unpaid principal, with no related allowance recorded	7,183	5,885	8,519
Average recorded Investment, with no related allowance recorded	4,331	4,554	5,228
Interest income Recognized, with no related allowance recorded	36	13	99
Recorded investment, with an allowance recorded	4,981	3,934	4,177
Unpaid principal, with an allowance recorded	6,712	5,147	4,977
Related allowance, with an allowance recorded	2,009	1,577	2,365
Average recorded Investment, with an allowance recorded	4,527	4,648	4,770
Interest income Recognized, with an allowance recorded	61	56	122
Home Equity Lines of Credit [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	287		110
Unpaid principal, with no related allowance recorded	319		126
Average recorded Investment, with no related allowance recorded	302		55
Interest income Recognized, with no related allowance recorded	8		5
Recorded investment, with an allowance recorded	416
Unpaid principal, with an allowance recorded	418
Related allowance, with an allowance recorded	132
Average recorded Investment, with an allowance recorded	122
Interest income Recognized, with an allowance recorded	17
Home Equity Loans [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	390	386	224
Unpaid principal, with no related allowance recorded	866	947	528
Average recorded Investment, with no related allowance recorded	314	539	458
Interest income Recognized, with no related allowance recorded	4	4	7
Recorded investment, with an allowance recorded	293	170	350
Unpaid principal, with an allowance recorded	555	181	666
Related allowance, with an allowance recorded	174	92	73
Average recorded Investment, with an allowance recorded	261	125	215
Interest income Recognized, with an allowance recorded	6	3	3
Home Equity Loans [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded			87
Unpaid principal, with no related allowance recorded			89
Average recorded Investment, with no related allowance recorded	15		44
Interest income Recognized, with no related allowance recorded			2
Recorded investment, with an allowance recorded
Unpaid principal, with an allowance recorded
Related allowance, with an allowance recorded
Average recorded Investment, with an allowance recorded
Interest income Recognized, with an allowance recorded
Auto Indirect [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	207	477	424
Unpaid principal, with no related allowance recorded	375	891	777
Average recorded Investment, with no related allowance recorded	289	596	569
Interest income Recognized, with no related allowance recorded	3	11	15
Recorded investment, with an allowance recorded	53	326	147
Unpaid principal, with an allowance recorded	74	408	193
Related allowance, with an allowance recorded	9	76	29
Average recorded Investment, with an allowance recorded	90	497	407
Interest income Recognized, with an allowance recorded	1	5	2
Auto Indirect [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded
Unpaid principal, with no related allowance recorded
Average recorded Investment, with no related allowance recorded
Interest income Recognized, with no related allowance recorded
Recorded investment, with an allowance recorded
Unpaid principal, with an allowance recorded
Related allowance, with an allowance recorded
Average recorded Investment, with an allowance recorded
Interest income Recognized, with an allowance recorded
Other Consumer [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	32	31	39
Unpaid principal, with no related allowance recorded	52	35	56
Average recorded Investment, with no related allowance recorded	47	40	44
Interest income Recognized, with no related allowance recorded		1	2
Recorded investment, with an allowance recorded	31	73	70
Unpaid principal, with an allowance recorded	33	79	75
Related allowance, with an allowance recorded	8	21	24
Average recorded Investment, with an allowance recorded	39	54	52
Interest income Recognized, with an allowance recorded		1	2
Other Consumer [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded
Unpaid principal, with no related allowance recorded
Average recorded Investment, with no related allowance recorded	41
Interest income Recognized, with no related allowance recorded
Recorded investment, with an allowance recorded	73
Unpaid principal, with an allowance recorded	77
Related allowance, with an allowance recorded	37
Average recorded Investment, with an allowance recorded	33
Interest income Recognized, with an allowance recorded	1
C&I [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	6,907	6,698	8,473
Unpaid principal, with no related allowance recorded	7,753	7,344	9,229
Average recorded Investment, with no related allowance recorded	8,143	5,799	6,687
Interest income Recognized, with no related allowance recorded	43	170	381
Recorded investment, with an allowance recorded	1,789	1,334	964
Unpaid principal, with an allowance recorded	1,826	1,968	1,040
Related allowance, with an allowance recorded	773	260	200
Average recorded Investment, with an allowance recorded	1,359	1,208	1,023
Interest income Recognized, with an allowance recorded	72	41	36
C&I [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded			89
Unpaid principal, with no related allowance recorded			98
Average recorded Investment, with no related allowance recorded	15		45
Interest income Recognized, with no related allowance recorded			3
Recorded investment, with an allowance recorded
Unpaid principal, with an allowance recorded
Related allowance, with an allowance recorded
Average recorded Investment, with an allowance recorded
Interest income Recognized, with an allowance recorded
Construction [Member] | Residential [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	3,879	4,408	1,809
Unpaid principal, with no related allowance recorded	9,010	9,142	2,857
Average recorded Investment, with no related allowance recorded	3,434	5,242	3,942
Interest income Recognized, with no related allowance recorded	19
Recorded investment, with an allowance recorded	247	1,718	3,818
Unpaid principal, with an allowance recorded	295	2,724	8,698
Related allowance, with an allowance recorded	40	326	258
Average recorded Investment, with an allowance recorded	1,529	1,284	2,334
Interest income Recognized, with an allowance recorded	3		(16)
Construction [Member] | Residential [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded
Unpaid principal, with no related allowance recorded
Average recorded Investment, with no related allowance recorded
Interest income Recognized, with no related allowance recorded
Recorded investment, with an allowance recorded
Unpaid principal, with an allowance recorded
Related allowance, with an allowance recorded
Average recorded Investment, with an allowance recorded
Interest income Recognized, with an allowance recorded
Construction [Member] | Commercial [Member] | Originated loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded	524	6,640	571
Unpaid principal, with no related allowance recorded	864	6,918	916
Average recorded Investment, with no related allowance recorded	554	6,625	3,590
Interest income Recognized, with no related allowance recorded	8	289	4
Recorded investment, with an allowance recorded	6,431	646	6,328
Unpaid principal, with an allowance recorded	6,544	679	6,330
Related allowance, with an allowance recorded	550	481	971
Average recorded Investment, with an allowance recorded	6,463	737	3,578
Interest income Recognized, with an allowance recorded	287	6	387
Construction [Member] | Commercial [Member] | PNCI loans [Member]
Impaired Loans
Recorded investment, with no related allowance recorded
Unpaid principal, with no related allowance recorded
Average recorded Investment, with no related allowance recorded
Interest income Recognized, with no related allowance recorded
Recorded investment, with an allowance recorded
Unpaid principal, with an allowance recorded
Related allowance, with an allowance recorded
Average recorded Investment, with an allowance recorded
Interest income Recognized, with an allowance recorded