Loans and Leases, Past Due (Details) (USD $)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	$ 3,916,000			$ 3,916,000		$ 3,659,000
60-89 Days Past Due	143,000			143,000		510,000
Accruing 90+Days	0			0		0
Total Non-accrual	28,571,000			28,571,000		38,755,000
Current	340,206,000			340,206,000		371,942,000
Subtotal LHFI	372,836,000		438,561,000	372,836,000	438,561,000	414,866,000
Less: Deferred loan fees	(491,000)			(491,000)		(623,000)
Total LHFI	372,345,000			372,345,000		414,243,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	28,571,000			28,571,000		38,755,000
Total non-accrual LHFI, Specific reserves	1,875,000			1,875,000		138,000
Non-accrual loans held for sale [Abstract]
Total non-accrual LHFS, Loan balance	3,574,000			3,574,000		12,569,000
Non-accrual loans held for sale, Specific reserves	0			0		0
Total non-accrual loans, Loan balance	32,145,000	2,700,000		32,145,000		51,324,000
Non-accrual loans, Specific reserves	1,875,000			1,875,000		138,000
Period decrease in nonaccrual loans				19,200,000
Transfer to other real estate owned				9,096,000	4,499,000
Reduction in existing non accrual loan balances				15,100,000
Charge-offs to the allowance for loan and lease losses	628,000		6,897,000	781,000	7,074,000	13,211,000
Addition of non accrual loan balance				5,800,000
Interest income accrued	831,000			1,800,000
Cash collected on non accrual and impaired loan				17,800,000	13,800,000
Amount credited to principal balance outstanding				15,600,000	13,800,000
Summary of impaired loans [Abstract]
Impaired Loans With Valuation Allowance	4,829,000			4,829,000		1,068,000
Impaired loans without a valuation allowance	28,126,000			28,126,000		45,009,000
Impaired LHFS	3,574,000			3,574,000		12,569,000
Total impaired loans	36,529,000			36,529,000		58,646,000
Valuation allowance related to impaired loans	1,875,000			1,875,000		138,000
Number of impaired loan	6			6
Number of troubled debt restructurings	10			10		12
Number of sale of troubled debt restructurings		2
Carrying value of troubled debt restructurings	12,266,000			12,266,000		14,200,000
Proceeds from sale of troubled debt restructurings		980,000
Commercial and industrial [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	796,000			796,000		148,000
60-89 Days Past Due	0			0		0
Accruing 90+Days	0			0		0
Total Non-accrual	5,643,000			5,643,000		4,720,000
Current	41,128,000			41,128,000		49,268,000
Subtotal LHFI	47,567,000		56,282,000	47,567,000	56,282,000	54,136,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	5,643,000			5,643,000		4,720,000
Total non-accrual LHFI, Specific reserves	139,000			139,000		0
Non-accrual loans held for sale [Abstract]
Non-accrual loans, Specific reserves	139,000			139,000		0
Charge-offs to the allowance for loan and lease losses	208,000		552,000	208,000	552,000	2,901,000
Summary of impaired loans [Abstract]
Impaired loans without a valuation allowance	5,382,000			5,382,000		7,267,000
Valuation allowance related to impaired loans	139,000			139,000		0
Construction and land development [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	289,000			289,000		0
60-89 Days Past Due	0			0		0
Accruing 90+Days	0			0		0
Total Non-accrual	6,818,000			6,818,000		13,014,000
Current	39,441,000			39,441,000		41,106,000
Subtotal LHFI	46,548,000		66,313,000	46,548,000	66,313,000	54,120,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	6,818,000			6,818,000		13,014,000
Total non-accrual LHFI, Specific reserves	1,243,000			1,243,000		0
Non-accrual loans held for sale [Abstract]
Total non-accrual LHFS, Loan balance	0			0		8,901,000
Non-accrual loans held for sale, Specific reserves	0			0		0
Non-accrual loans, Specific reserves	1,243,000			1,243,000		0
Charge-offs to the allowance for loan and lease losses	0		3,649,000	0	3,649,000	5,755,000
Summary of impaired loans [Abstract]
Impaired loans without a valuation allowance	8,578,000			8,578,000		17,368,000
Valuation allowance related to impaired loans	1,243,000			1,243,000		0
Construction [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Subtotal LHFI	5,934,000			5,934,000		14,066,000
Land development [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
Subtotal LHFI	40,614,000			40,614,000		40,054,000
Residential real estate [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	299,000			299,000		527,000
60-89 Days Past Due	124,000			124,000		382,000
Accruing 90+Days	0			0		0
Total Non-accrual	1,325,000			1,325,000		1,139,000
Current	24,808,000			24,808,000		24,589,000
Subtotal LHFI	26,556,000		27,631,000	26,556,000	27,631,000	26,637,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	1,325,000			1,325,000		1,139,000
Total non-accrual LHFI, Specific reserves	22,000			22,000		24,000
Non-accrual loans held for sale [Abstract]
Total non-accrual LHFS, Loan balance	0			0		34,000
Non-accrual loans held for sale, Specific reserves	0			0		0
Non-accrual loans, Specific reserves	22,000			22,000		24,000
Charge-offs to the allowance for loan and lease losses	0		507,000	0	507,000	635,000
Summary of impaired loans [Abstract]
Impaired loans without a valuation allowance	600,000			600,000		337,000
Valuation allowance related to impaired loans	22,000			22,000		24,000
Commercial real estate [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	2,213,000			2,213,000		2,837,000
60-89 Days Past Due	0			0		100,000
Accruing 90+Days	0			0		0
Total Non-accrual	12,047,000			12,047,000		16,671,000
Current	152,055,000			152,055,000		162,971,000
Subtotal LHFI	166,315,000		180,103,000	166,315,000	180,103,000	182,579,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	12,047,000			12,047,000		16,671,000
Total non-accrual LHFI, Specific reserves	0			0		0
Non-accrual loans held for sale [Abstract]
Total non-accrual LHFS, Loan balance	3,574,000			3,574,000		3,634,000
Non-accrual loans held for sale, Specific reserves	0			0		0
Non-accrual loans, Specific reserves	0			0		0
Charge-offs to the allowance for loan and lease losses	0		1,685,000	0	1,685,000	1,685,000
Summary of impaired loans [Abstract]
Impaired loans without a valuation allowance	12,674,000			12,674,000		17,311,000
Valuation allowance related to impaired loans	0			0		0
Multi-family [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	0			0		0
60-89 Days Past Due	0			0		0
Accruing 90+Days	0			0		0
Total Non-accrual	1,673,000			1,673,000		1,703,000
Current	11,335,000			11,335,000		9,919,000
Subtotal LHFI	13,008,000		9,880,000	13,008,000	9,880,000	11,622,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	1,673,000			1,673,000		1,703,000
Total non-accrual LHFI, Specific reserves	439,000			439,000		0
Non-accrual loans held for sale [Abstract]
Non-accrual loans, Specific reserves	439,000			439,000		0
Charge-offs to the allowance for loan and lease losses	0		329,000	0	329,000	328,000
Summary of impaired loans [Abstract]
Impaired loans without a valuation allowance	0			0		1,703,000
Valuation allowance related to impaired loans	439,000			439,000		0
Leases [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	314,000			314,000		147,000
60-89 Days Past Due	19,000			19,000		28,000
Accruing 90+Days	0			0		0
Total Non-accrual	172,000			172,000		485,000
Current	37,270,000			37,270,000		35,354,000
Subtotal LHFI	37,775,000		37,598,000	37,775,000	37,598,000	36,014,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	172,000			172,000		485,000
Total non-accrual LHFI, Specific reserves	32,000			32,000		114,000
Non-accrual loans held for sale [Abstract]
Non-accrual loans, Specific reserves	32,000			32,000		114,000
Charge-offs to the allowance for loan and lease losses	162,000		133,000	295,000	309,000	868,000
Summary of impaired loans [Abstract]
Valuation allowance related to impaired loans	32,000			32,000		114,000
Other [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	5,000			5,000		0
60-89 Days Past Due	0			0		0
Accruing 90+Days	0			0		0
Total Non-accrual	0			0		0
Current	968,000			968,000		949,000
Subtotal LHFI	973,000		745,000	973,000	745,000	949,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	0			0		0
Non-accrual loans held for sale [Abstract]
Charge-offs to the allowance for loan and lease losses	0		0	0	0	0
Tax Certificates [Member]
Aging analysis of past due payments for each loan portfolio segment [Abstract]
30-59 Days Past Due	0			0		0
60-89 Days Past Due	0			0		0
Accruing 90+Days	0			0		0
Total Non-accrual	893,000			893,000		1,023,000
Current	33,201,000			33,201,000		47,786,000
Subtotal LHFI	34,094,000		60,009,000	34,094,000	60,009,000	48,809,000
Non-accrual loans held for investment [Abstract]
Total non-accrual LHFI, Loan balance	893,000			893,000		1,023,000
Total non-accrual LHFI, Specific reserves	0			0		0
Non-accrual loans held for sale [Abstract]
Non-accrual loans, Specific reserves	0			0		0
Charge-offs to the allowance for loan and lease losses	258,000		42,000	278,000	43,000	1,039,000
Summary of impaired loans [Abstract]
Impaired loans without a valuation allowance	892,000			892,000		1,023,000
Valuation allowance related to impaired loans	$ 0			$ 0		$ 0