Acquired Loans (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Less allowance for loan losses, acquired loans	$ 773	$ 502
Net acquired loans	174,315	76,302
Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	74,419	76,804
Less allowance for loan losses, acquired loans	736	502
Net acquired loans	73,683	76,302
Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	100,669	4,363	[1]
Less allowance for loan losses, acquired loans	37	0	[1]
Net acquired loans	100,632	4,363	[1]
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	3,940
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	14,346	0	[1]
Real Estate Secured Financing Receivable [Member] | Residential Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	30,221
Real Estate Secured Financing Receivable [Member] | Residential Financing Receivable [Member] | Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	20,409	76	[1]
Real Estate Secured Financing Receivable [Member] | Nonresidential Properties Financing Receivables [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	30,737
Real Estate Secured Financing Receivable [Member] | Nonresidential Properties Financing Receivables [Member] | Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	54,954	0	[1]
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	5,087
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	695	0	[1]
Commercial And Industrial Loans [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	2,768	2,971
Commercial And Industrial Loans [Member] | Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	5,732	69	[1]
Consumer Loans Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	206	290
Consumer Loans Financing Receivable [Member] | Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	4,188	4,146	[1]
Consumer Loans Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans		4,209
Consumer Loans Financing Receivable [Member] | Residential Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans		31,874
Consumer Loans Financing Receivable [Member] | Nonresidential Properties Financing Receivables [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans		30,889
Consumer Loans Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans		5,126
Other Loans Financing Receivable [Member] | Covered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	1,460	1,445
Other Loans Financing Receivable [Member] | Noncovered [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	$ 345	$ 72	[1]

[1] Acquired noncovered loans were included in LFHI at December 31, 2011.