Loans and Allowance for Loan Losses (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	$ 20,038,000	$ 33,129,000
Recorded Principal Balance, with no related allowance	11,752,000	20,839,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	16,770,000	27,540,000
Impaired loans, Unpaid Contractual Principal Balance	69,166,000	97,771,000
Impaired loans, Recorded Principal Balance	57,279,000	70,978,000
Impaired loans, Related Allowance	17,189,000	18,996,000
Impaired loans, Year-To-Date Average Recorded Principal Balance	61,318,000	68,467,000
Unpaid Contractual Principal Balance, with related allowance	49,128,000	64,642,000
Recorded Principal Balance, with related allowance	45,527,000	50,139,000
Year-To-Date Average Recorded Principal Balance, with related allowance	44,548,000	40,927,000
Commercial and industrial [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	1,926,000	4,670,000
Recorded Principal Balance, with no related allowance	1,617,000	4,254,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	3,140,000	3,194,000
Impaired loans, Related Allowance	924,000	1,172,000
Unpaid Contractual Principal Balance, with related allowance	3,221,000	3,500,000
Recorded Principal Balance, with related allowance	1,926,000	3,023,000
Year-To-Date Average Recorded Principal Balance, with related allowance	3,110,000	4,972,000
Vacant land, land development, and residential construction [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	2,356,000	5,308,000
Recorded Principal Balance, with no related allowance	1,401,000	2,755,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	1,848,000	6,413,000
Impaired loans, Related Allowance	1,367,000	1,799,000
Unpaid Contractual Principal Balance, with related allowance	2,333,000	5,551,000
Recorded Principal Balance, with related allowance	2,219,000	4,267,000
Year-To-Date Average Recorded Principal Balance, with related allowance	3,267,000	4,319,000
Real estate - owner occupied [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	2,368,000	5,525,000
Recorded Principal Balance, with no related allowance	1,557,000	3,572,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	3,139,000	4,246,000
Impaired loans, Related Allowance	1,388,000	2,180,000
Unpaid Contractual Principal Balance, with related allowance	4,307,000	8,544,000
Recorded Principal Balance, with related allowance	3,626,000	7,039,000
Year-To-Date Average Recorded Principal Balance, with related allowance	4,913,000	6,648,000
Real estate - non-owner occupied [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	9,984,000	14,017,000
Recorded Principal Balance, with no related allowance	5,492,000	8,131,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	6,578,000	11,953,000
Impaired loans, Related Allowance	11,773,000	7,319,000
Unpaid Contractual Principal Balance, with related allowance	33,818,000	32,331,000
Recorded Principal Balance, with related allowance	32,964,000	22,009,000
Year-To-Date Average Recorded Principal Balance, with related allowance	25,061,000	14,942,000
Real estate - multi-family and residential rental [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	1,188,000	1,309,000
Recorded Principal Balance, with no related allowance	413,000	671,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	756,000	862,000
Impaired loans, Related Allowance	1,408,000	6,175,000
Unpaid Contractual Principal Balance, with related allowance	4,471,000	13,913,000
Recorded Principal Balance, with related allowance	3,923,000	13,172,000
Year-To-Date Average Recorded Principal Balance, with related allowance	7,429,000	8,322,000
Total commercial [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	17,822,000	30,829,000
Recorded Principal Balance, with no related allowance	10,480,000	19,383,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	15,461,000	26,668,000
Impaired loans, Unpaid Contractual Principal Balance	65,972,000	94,668,000
Impaired loans, Recorded Principal Balance	55,138,000	68,893,000
Impaired loans, Related Allowance	16,860,000	18,645,000
Impaired loans, Year-To-Date Average Recorded Principal Balance	59,241,000	65,871,000
Unpaid Contractual Principal Balance, with related allowance	48,150,000	63,839,000
Recorded Principal Balance, with related allowance	44,658,000	49,510,000
Year-To-Date Average Recorded Principal Balance, with related allowance	43,780,000	39,203,000
Retail home equity and other [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	580,000	1,000,000
Recorded Principal Balance, with no related allowance	483,000	727,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	579,000	439,000
Impaired loans, Related Allowance	204,000	215,000
Unpaid Contractual Principal Balance, with related allowance	423,000	286,000
Recorded Principal Balance, with related allowance	394,000	229,000
Year-To-Date Average Recorded Principal Balance, with related allowance	286,000	1,069,000
Retail 1-4 family mortgages [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	1,636,000	1,300,000
Recorded Principal Balance, with no related allowance	789,000	729,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	730,000	433,000
Impaired loans, Related Allowance	125,000	136,000
Unpaid Contractual Principal Balance, with related allowance	555,000	517,000
Recorded Principal Balance, with related allowance	475,000	400,000
Year-To-Date Average Recorded Principal Balance, with related allowance	482,000	655,000
Total retail [Member]
Impaired loans
Unpaid Contractual Principal Balance, with no related allowance	2,216,000	2,300,000
Recorded Principal Balance, with no related allowance	1,272,000	1,456,000
Year-To-Date Average Recorded Principal Balance, with no related allowance	1,309,000	872,000
Impaired loans, Unpaid Contractual Principal Balance	3,194,000	3,103,000
Impaired loans, Recorded Principal Balance	2,141,000	2,085,000
Impaired loans, Related Allowance	329,000	351,000
Impaired loans, Year-To-Date Average Recorded Principal Balance	2,077,000	2,596,000
Unpaid Contractual Principal Balance, with related allowance	978,000	803,000
Recorded Principal Balance, with related allowance	869,000	629,000
Year-To-Date Average Recorded Principal Balance, with related allowance	$ 768,000	$ 1,724,000