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Loans Impaired Loans by Class (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Schedule of Financing Receivables [Line Items]
Recorded Investment	$ 47,376	$ 41,133	$ 45,744
Unpaid Principal Balance	51,532	41,133	49,542
Related Allowance	3,105	2,348	3,539
Average Recorded Investment	47,322	41,595	45,019
Recognized Interest Income	396	165	1,039
With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	29,979	26,701	28,282
Unpaid Principal Balance	33,286	26,701	31,303
Related Allowance	0	0	0
Average Recorded Investment	28,462	25,916	26,837
Recognized Interest Income	235	91	468
With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	17,397	14,432	17,462
Unpaid Principal Balance	18,246	14,432	18,239
Related Allowance	3,105	2,348	3,539
Average Recorded Investment	18,860	15,679	18,182
Recognized Interest Income	161	74	571
Commercial Real Estate [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	17,534	14,295	15,774
Unpaid Principal Balance	18,685	14,295	16,981
Related Allowance	1,473	944	1,523
Average Recorded Investment	16,954	12,723	14,716
Recognized Interest Income	163	50	410
Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	11,010	10,704	9,386
Unpaid Principal Balance	11,468	10,704	9,963
Related Allowance	0	0	0
Average Recorded Investment	10,154	8,445	10,102
Recognized Interest Income	101	40	199
Commercial Real Estate [Member] | With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	6,524	3,591	6,388
Unpaid Principal Balance	7,217	3,591	7,018
Related Allowance	1,473	944	1,523
Average Recorded Investment	6,800	4,278	4,614
Recognized Interest Income	62	10	211
Commercial Real Estate Construction Financing Receivable [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	2,347	2,093	3,354
Unpaid Principal Balance	2,367	2,093	3,368
Related Allowance	760	117	969
Average Recorded Investment	3,018	3,580	4,349
Recognized Interest Income	27	13	85
Commercial Real Estate Construction Financing Receivable [Member] | With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	95	1,362	101
Unpaid Principal Balance	115	1,362	115
Related Allowance	0	0	0
Average Recorded Investment	43	2,983	2,533
Recognized Interest Income	1	13	0
Commercial Real Estate Construction Financing Receivable [Member] | With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	2,252	731	3,253
Unpaid Principal Balance	2,252	731	3,253
Related Allowance	760	117	969
Average Recorded Investment	2,975	597	1,816
Recognized Interest Income	26	0	85
Commercial Other [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	5,550	3,886	5,861
Unpaid Principal Balance	6,306	3,886	6,471
Related Allowance	535	480	652
Average Recorded Investment	5,792	5,204	4,851
Recognized Interest Income	36	13	91
Commercial Other [Member] | With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	3,580	2,811	4,737
Unpaid Principal Balance	4,315	2,811	5,345
Related Allowance	0	0	0
Average Recorded Investment	3,695	2,981	2,877
Recognized Interest Income	27	8	53
Commercial Other [Member] | With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,970	1,075	1,124
Unpaid Principal Balance	1,991	1,075	1,126
Related Allowance	535	480	652
Average Recorded Investment	2,097	2,223	1,974
Recognized Interest Income	9	5	38
Residential Term [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	20,262	18,054	19,444
Unpaid Principal Balance	22,262	18,054	21,282
Related Allowance	337	592	395
Average Recorded Investment	19,892	17,450	18,867
Recognized Interest Income	162	89	426
Residential Term [Member] | With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	13,611	9,930	12,747
Unpaid Principal Balance	15,476	9,930	14,440
Related Allowance	0	0	0
Average Recorded Investment	13,078	10,001	9,801
Recognized Interest Income	98	30	189
Residential Term [Member] | With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	6,651	8,124	6,697
Unpaid Principal Balance	6,786	8,124	6,842
Related Allowance	337	592	395
Average Recorded Investment	6,814	7,449	9,066
Recognized Interest Income	64	59	237
Residential Construction [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	1,454	0
Unpaid Principal Balance	0	1,454	0
Related Allowance	0	49	0
Average Recorded Investment	0	1,316	821
Recognized Interest Income	0	0	0
Residential Construction [Member] | With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	1,120	0
Unpaid Principal Balance	0	1,120	0
Related Allowance	0	0	0
Average Recorded Investment	0	718	560
Recognized Interest Income	0	0	0
Residential Construction [Member] | With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	334	0
Unpaid Principal Balance	0	334	0
Related Allowance	0	49	0
Average Recorded Investment	0	598	261
Recognized Interest Income	0	0	0
Home Equity [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,683	1,336	1,311
Unpaid Principal Balance	1,912	1,336	1,440
Related Allowance	0	156	0
Average Recorded Investment	1,666	1,295	1,403
Recognized Interest Income	8	0	27
Home Equity [Member] | With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	1,683	774	1,311
Unpaid Principal Balance	1,912	774	1,440
Related Allowance	0	0	0
Average Recorded Investment	1,492	776	961
Recognized Interest Income	8	0	27
Home Equity [Member] | With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	562	0
Unpaid Principal Balance	0	562	0
Related Allowance	0	156	0
Average Recorded Investment	174	519	442
Recognized Interest Income	0	0	0
Consumer Loan [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	15	0
Unpaid Principal Balance	0	15	0
Related Allowance	0	10	0
Average Recorded Investment	0	27	12
Recognized Interest Income	0	0	0
Consumer Loan [Member] | With No Related Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Average Recorded Investment	0	12	3
Recognized Interest Income	0	0	0
Consumer Loan [Member] | With an Allowance Recorded [Member]
Schedule of Financing Receivables [Line Items]
Recorded Investment	0	15	0
Unpaid Principal Balance	0	15	0
Related Allowance	0	10	0
Average Recorded Investment	0	15	9
Recognized Interest Income	$ 0	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524



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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Publisher FASB

-Name Accounting Standards Codification

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