Allowance for Loan Losses, Summary of Impaired Loans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary of impaired loans [Abstract]
Impaired loans with no allowance recorded, Unpaid Principal Balance	$ 20,463	$ 107,335
Impaired loans with an allowance recorded, Unpaid Principal Balance	8,802	38,693
Impaired loans, Unpaid Principal Balance, Total	29,265	146,028
Impaired loans with no allowance recorded, Recorded Investment	18,304	97,504
Impaired loans with an allowance recorded, Recorded Investment	8,652	37,596
Impaired Loans, Recorded Investment, Total	26,956	135,100
Impaired Loans, No Allowance Allocated	0	0
Impaired Loans, Allowance Allocated	1,024	10,626
Average recorded investment in impaired loans	87,947	121,931
Interest income recognized on impaired loans	1,498	4,392
Interest income recognized on a cash basis on impaired loans	0	0
Commercial and Industrial [Member]
Summary of impaired loans [Abstract]
Impaired loans with no allowance recorded, Unpaid Principal Balance	7,913	21,162
Impaired loans with an allowance recorded, Unpaid Principal Balance	2,884	15,877
Impaired loans with no allowance recorded, Recorded Investment	7,492	20,885
Impaired loans with an allowance recorded, Recorded Investment	2,877	15,674
Impaired Loans, No Allowance Allocated	0	0
Impaired Loans, Allowance Allocated	340	7,477
Average recorded investment in impaired loans	23,215	25,179
Interest income recognized on impaired loans	447	1,422
Interest income recognized on a cash basis on impaired loans	0	0
Commercial Real Estate [Member]
Summary of impaired loans [Abstract]
Impaired loans with no allowance recorded, Unpaid Principal Balance	8,859	52,679
Impaired loans with an allowance recorded, Unpaid Principal Balance	2,161	20,609
Impaired loans with no allowance recorded, Recorded Investment	7,282	46,687
Impaired loans with an allowance recorded, Recorded Investment	2,161	19,715
Impaired Loans, No Allowance Allocated	0	0
Impaired Loans, Allowance Allocated	22	3,092
Average recorded investment in impaired loans	38,477	55,449
Interest income recognized on impaired loans	501	2,970
Interest income recognized on a cash basis on impaired loans	0	0
Real Estate Construction [Member]
Summary of impaired loans [Abstract]
Impaired loans with no allowance recorded, Unpaid Principal Balance	1,334	19,939
Impaired loans with an allowance recorded, Unpaid Principal Balance	656	2,207
Impaired loans with no allowance recorded, Recorded Investment	1,305	17,044
Impaired loans with an allowance recorded, Recorded Investment	656	2,207
Impaired Loans, No Allowance Allocated	0	0
Impaired Loans, Allowance Allocated	1	57
Average recorded investment in impaired loans	13,681	30,641
Interest income recognized on impaired loans	410	0
Interest income recognized on a cash basis on impaired loans	0	0
Residential Mortgages (1st and 2nd Liens) [Member]
Summary of impaired loans [Abstract]
Impaired loans with no allowance recorded, Unpaid Principal Balance	1,918	8,914
Impaired loans with an allowance recorded, Unpaid Principal Balance	3,015	0
Impaired loans with no allowance recorded, Recorded Investment	1,788	8,345
Impaired loans with an allowance recorded, Recorded Investment	2,872	0
Impaired Loans, No Allowance Allocated	0	0
Impaired Loans, Allowance Allocated	575	0
Average recorded investment in impaired loans	9,538	6,956
Interest income recognized on impaired loans	127	0
Interest income recognized on a cash basis on impaired loans	0	0
Home Equity [Member]
Summary of impaired loans [Abstract]
Impaired loans with no allowance recorded, Unpaid Principal Balance	418	3,995
Impaired loans with an allowance recorded, Unpaid Principal Balance	86	0
Impaired loans with no allowance recorded, Recorded Investment	416	3,897
Impaired loans with an allowance recorded, Recorded Investment	86	0
Impaired Loans, No Allowance Allocated	0	0
Impaired Loans, Allowance Allocated	86	0
Average recorded investment in impaired loans	2,607	3,369
Interest income recognized on impaired loans	13	0
Interest income recognized on a cash basis on impaired loans	0	0
Consumer and Other Loans [Member]
Summary of impaired loans [Abstract]
Impaired loans with no allowance recorded, Unpaid Principal Balance	21	646
Impaired loans with no allowance recorded, Recorded Investment	21	646
Impaired Loans, No Allowance Allocated	0	0
Consumer and Other Loans [Member]
Summary of impaired loans [Abstract]
Average recorded investment in impaired loans	429	337
Interest income recognized on impaired loans	0	0
Interest income recognized on a cash basis on impaired loans	$ 0	$ 0