Loans (Summary of Impaired Loans by Classes of Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 42,961	$ 52,326
Unpaid Principal Balance	43,751	54,966
Related Valuation Allowance	8,108	9,286
Average Annual Recorded Investment	48,611	59,212
Interest Income Recognized While on Impaired Status	1,353	1,433
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	86,002	87,895
Unpaid Principal Balance	106,354	117,360
Related Valuation Allowance	0	0
Average Annual Recorded Investment	84,419	98,096
Interest Income Recognized While on Impaired Status	2,371	2,131
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	128,963	140,221
Unpaid Principal Balance	150,105	172,326
Related Valuation Allowance	8,108	9,286
Average Annual Recorded Investment	133,030	157,308
Interest Income Recognized While on Impaired Status	3,724	3,564
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	6,368	6,362
Unpaid Principal Balance	6,818	7,650
Related Valuation Allowance	1,966	1,480
Average Annual Recorded Investment	6,108	6,997
Interest Income Recognized While on Impaired Status	0	0
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	23,230	19,559
Unpaid Principal Balance	27,959	29,349
Related Valuation Allowance	0	0
Average Annual Recorded Investment	21,651	22,900
Interest Income Recognized While on Impaired Status	964	1,000
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	29,598	25,921
Unpaid Principal Balance	34,777	36,999
Related Valuation Allowance	1,966	1,480
Average Annual Recorded Investment	27,759	29,897
Interest Income Recognized While on Impaired Status	964	1,000
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	17,267	20,050
Unpaid Principal Balance	17,607	21,370
Related Valuation Allowance	5,359	6,775
Average Annual Recorded Investment	19,788	27,762
Interest Income Recognized While on Impaired Status	0	0
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	37,223	40,953
Unpaid Principal Balance	48,531	54,249
Related Valuation Allowance	0	0
Average Annual Recorded Investment	38,342	41,663
Interest Income Recognized While on Impaired Status	1,020	767
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	54,490	61,003
Unpaid Principal Balance	66,138	75,619
Related Valuation Allowance	5,359	6,775
Average Annual Recorded Investment	58,130	69,425
Interest Income Recognized While on Impaired Status	1,020	767
Real estate construction [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	171
Unpaid Principal Balance	171
Related Valuation Allowance	75
Average Annual Recorded Investment	130
Interest Income Recognized While on Impaired Status	0
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,046	156
Unpaid Principal Balance	1,116	934
Related Valuation Allowance	0	0
Average Annual Recorded Investment	543	181
Interest Income Recognized While on Impaired Status	0	12
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,217	156
Unpaid Principal Balance	1,287	934
Related Valuation Allowance	75	0
Average Annual Recorded Investment	673	181
Interest Income Recognized While on Impaired Status	0	12
Land development [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	254	902
Unpaid Principal Balance	254	934
Related Valuation Allowance	50	327
Average Annual Recorded Investment	1,278	1,928
Interest Income Recognized While on Impaired Status	0	0
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	10,867	10,187
Unpaid Principal Balance	15,112	15,788
Related Valuation Allowance	0	0
Average Annual Recorded Investment	7,811	11,507
Interest Income Recognized While on Impaired Status	387	352
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	11,121	11,089
Unpaid Principal Balance	15,366	16,722
Related Valuation Allowance	50	327
Average Annual Recorded Investment	9,089	13,435
Interest Income Recognized While on Impaired Status	387	352
Real estate residential [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	18,901	25,012
Unpaid Principal Balance	18,901	25,012
Related Valuation Allowance	658	704
Average Annual Recorded Investment	21,307	22,525
Interest Income Recognized While on Impaired Status	1,353	1,433
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	10,164	12,573
Unpaid Principal Balance	10,164	12,573
Related Valuation Allowance	0	0
Average Annual Recorded Investment	12,057	16,054
Interest Income Recognized While on Impaired Status	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	29,065	37,585
Unpaid Principal Balance	29,065	37,585
Related Valuation Allowance	658	704
Average Annual Recorded Investment	33,364	38,579
Interest Income Recognized While on Impaired Status	1,353	1,433
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	739	1,707
Unpaid Principal Balance	739	1,707
Related Valuation Allowance	0	0
Average Annual Recorded Investment	1,093	2,665
Interest Income Recognized While on Impaired Status	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	739	1,707
Unpaid Principal Balance	739	1,707
Related Valuation Allowance	0	0
Average Annual Recorded Investment	1,093	2,665
Interest Income Recognized While on Impaired Status	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,733	2,760
Unpaid Principal Balance	2,733	2,760
Related Valuation Allowance	0	0
Average Annual Recorded Investment	2,922	3,126
Interest Income Recognized While on Impaired Status	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,733	2,760
Unpaid Principal Balance	2,733	2,760
Related Valuation Allowance	0	0
Average Annual Recorded Investment	2,922	3,126
Interest Income Recognized While on Impaired Status	$ 0	$ 0