Allowance for Loan Losses, Loans by Internal Assigned Grade for Credit Risk (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for loan losses
Balance, Beginning of Period	$ 39,958,000	$ 28,419,000	$ 12,333,000
Charge-offs	(33,946,000)	(14,597,000)	(16,238,000)
Recoveries	3,269,000	1,298,000	187,000
Reclass to allowance for contingent liabilities	0	(50,000)	51,000
(Credit) provision for loan losses	8,500,000	24,888,000	32,086,000
Balance, End of Period	17,781,000	39,958,000	28,419,000
Credit risk profile by internally assigned grade
Total	780,780,000	969,654,000
Pass [Member]
Credit risk profile by internally assigned grade
Total	681,865,000	711,504,000
Special Mention [Member]
Credit risk profile by internally assigned grade
Total	44,665,000	65,503,000
Substandard [Member]
Credit risk profile by internally assigned grade
Total	54,250,000	190,792,000
Doubtful [Member]
Credit risk profile by internally assigned grade
Total		1,855,000
Commercial and Industrial [Member]
Allowance for loan losses
Balance, Beginning of Period	25,080,000	13,826,000
Charge-offs	(8,534,000)	(9,490,000)
Recoveries	2,456,000	781,000
Reclass to allowance for contingent liabilities		0
(Credit) provision for loan losses	(11,745,000)	19,963,000
Balance, End of Period	7,257,000	25,080,000
Loss factor on unimpaired pass rate loans (in hundredths)	4.30%	9.98%
Loss factor on unimpaired special mention loans (in hundredths)	4.60%	8.68%
Credit risk profile by internally assigned grade
Total	168,709,000	206,652,000
Commercial and Industrial [Member] | Pass [Member]
Credit risk profile by internally assigned grade
Total	143,804,000	144,952,000
Commercial and Industrial [Member] | Special Mention [Member]
Credit risk profile by internally assigned grade
Total	5,995,000	16,448,000
Commercial and Industrial [Member] | Substandard [Member]
Credit risk profile by internally assigned grade
Total	18,910,000	45,009,000
Commercial and Industrial [Member] | Doubtful [Member]
Credit risk profile by internally assigned grade
Total		243,000
Commercial and Industrial [Member] | Unimpaired Pass Rated Loans [Member]
Allowance for loan losses
Impact of change in computed allowance for loan and lease losses period increase decrease	(10,000,000)
Commercial Real Estate [Member]
Allowance for loan losses
Balance, Beginning of Period	11,029,000	9,226,000
Charge-offs	(15,794,000)	(4,059,000)
Recoveries	0	0
Reclass to allowance for contingent liabilities		(50,000)
(Credit) provision for loan losses	11,985,000	5,912,000
Balance, End of Period	7,220,000	11,029,000
Impact of specific reserve for impaired substandard loans	(3,000,000)
Increase decrease in loss factor unimpaired pass rate loans (in basis points)	(22)
Credit risk profile by internally assigned grade
Total	369,271,000	428,646,000
Commercial Real Estate [Member] | Pass [Member]
Credit risk profile by internally assigned grade
Total	311,123,000	289,856,000
Commercial Real Estate [Member] | Special Mention [Member]
Credit risk profile by internally assigned grade
Total	38,670,000	41,283,000
Commercial Real Estate [Member] | Substandard [Member]
Credit risk profile by internally assigned grade
Total	19,478,000	97,507,000
Commercial Real Estate [Member] | Doubtful [Member]
Credit risk profile by internally assigned grade
Total		0
Real Estate Construction [Member]
Allowance for loan losses
Balance, Beginning of Period	623,000	3,177,000
Charge-offs	(3,671,000)	(232,000)
Recoveries	340,000	415,000
Reclass to allowance for contingent liabilities		0
(Credit) provision for loan losses	2,874,000	(2,737,000)
Balance, End of Period	166,000	623,000
Credit risk profile by internally assigned grade
Total	15,469,000	49,704,000
Real Estate Construction [Member] | Pass [Member]
Credit risk profile by internally assigned grade
Total	4,790,000	4,932,000
Real Estate Construction [Member] | Special Mention [Member]
Credit risk profile by internally assigned grade
Total	0	7,772,000
Real Estate Construction [Member] | Substandard [Member]
Credit risk profile by internally assigned grade
Total	10,679,000	35,388,000
Real Estate Construction [Member] | Doubtful [Member]
Credit risk profile by internally assigned grade
Total		1,612,000
Residential Mortgages (1st and 2nd Liens) [Member]
Allowance for loan losses
Balance, Beginning of Period	2,401,000	519,000
Charge-offs	(3,727,000)	(411,000)
Recoveries	115,000	3,000
Reclass to allowance for contingent liabilities		0
(Credit) provision for loan losses	3,062,000	2,290,000
Balance, End of Period	1,851,000	2,401,000
Credit risk profile by internally assigned grade
Total	146,575,000	160,619,000
Residential Mortgages (1st and 2nd Liens) [Member] | Pass [Member]
Credit risk profile by internally assigned grade
Total	141,915,000	152,274,000
Residential Mortgages (1st and 2nd Liens) [Member] | Special Mention [Member]
Credit risk profile by internally assigned grade
Total	0	0
Residential Mortgages (1st and 2nd Liens) [Member] | Substandard [Member]
Credit risk profile by internally assigned grade
Total	4,660,000	8,345,000
Residential Mortgages (1st and 2nd Liens) [Member] | Doubtful [Member]
Credit risk profile by internally assigned grade
Total		0
Home Equity [Member]
Allowance for loan losses
Balance, Beginning of Period	512,000	1,392,000
Charge-offs	(1,953,000)	(191,000)
Recoveries	246,000	2,000
Reclass to allowance for contingent liabilities		0
(Credit) provision for loan losses	2,260,000	(691,000)
Balance, End of Period	1,065,000	512,000
Credit risk profile by internally assigned grade
Total	66,468,000	79,684,000
Home Equity [Member] | Pass [Member]
Credit risk profile by internally assigned grade
Total	65,966,000	75,787,000
Home Equity [Member] | Special Mention [Member]
Credit risk profile by internally assigned grade
Total	0	0
Home Equity [Member] | Substandard [Member]
Credit risk profile by internally assigned grade
Total	502,000	3,897,000
Home Equity [Member] | Doubtful [Member]
Credit risk profile by internally assigned grade
Total		0
Consumer and Other Loans [Member]
Allowance for loan losses
Balance, End of Period	222,000	313,000
Credit risk profile by internally assigned grade
Total	14,288,000	44,349,000
Consumer and Other Loans [Member] | Pass [Member]
Credit risk profile by internally assigned grade
Total	14,267,000	43,703,000
Consumer and Other Loans [Member] | Special Mention [Member]
Credit risk profile by internally assigned grade
Total	0	0
Consumer and Other Loans [Member] | Substandard [Member]
Credit risk profile by internally assigned grade
Total	21,000	646,000
Consumer and Other Loans [Member] | Doubtful [Member]
Credit risk profile by internally assigned grade
Total		0
Consumer Loans [Member]
Allowance for loan losses
Balance, Beginning of Period	313,000	279,000
Charge-offs	(267,000)	(214,000)
Recoveries	112,000	97,000
Reclass to allowance for contingent liabilities		0
(Credit) provision for loan losses	64,000	151,000
Balance, End of Period	222,000	313,000
Credit risk profile by internally assigned grade
Total	$ 14,288,000	$ 44,349,000