Allowance for Loan Losses - Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of the period	$ 15,992	$ 18,270
Total loans charged-off	495	1,458
Total loan recoveries	605	669
Net loans charged-off (recovered)	(110)	789
Total provision charged to operating expense		2,084
Balance at the end of the period	16,102	19,565
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	29	417
Total loan recoveries	390	70
Total provision charged to operating expense	212	1,738
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off		132
Total loan recoveries	4	32
Commercial [Member] | Non-owner Occupied Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	22	146
Total loan recoveries	1	2
Commercial [Member] | Residential Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off
Total loan recoveries
Commercial [Member] | Development & Spec Land Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	7
Total loan recoveries
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off		139
Total loan recoveries	385	36
Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	22	143
Total loan recoveries	4	3
Total provision charged to operating expense	(604)	312
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	22	143
Total loan recoveries	4	3
Real Estate [Member] | Residential Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off
Total loan recoveries
Real Estate [Member] | Mortgage Warehousing [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off
Total loan recoveries
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	444	898
Total loan recoveries	211	596
Total provision charged to operating expense	392	34
Consumer [Member] | Direct Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	33	107
Total loan recoveries	18	394
Consumer [Member] | Direct Installment Purchased [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off
Total loan recoveries
Consumer [Member] | Indirect Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	227	353
Total loan recoveries	119	170
Consumer [Member] | Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans charged-off	184	438
Total loan recoveries	$ 74	$ 32