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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 29,483		$ 33,466
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	33,203		39,291
Recorded investment	56,203		59,383
Unpaid principal balance	62,292		66,307
Related allowance	10,503		8,824
Impaired Financing Receivable, with Related Allowance, Recorded Investment	26,720		25,917
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	29,089		27,016
Average recorded investment	21,755	37,649
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	54	61
Impaired Financing Receivable, Average Recorded Investment	54,740	96,859
Interest Income Recognized	166	161
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	32,985	59,210
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	112	100
Commercial, financial, agricultural and other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,788		6,752
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,960		7,649
Related allowance	9,886		7,364
Impaired Financing Receivable, with Related Allowance, Recorded Investment	22,940		21,482
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	23,559		22,082
Average recorded investment	17,649	25,803
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	45	19
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,953	8,592
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	17	51
Real estate construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,213		3,486
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,782		6,664
Related allowance	74		94
Impaired Financing Receivable, with Related Allowance, Recorded Investment	638		414
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,780		737
Average recorded investment	638	2,685
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	13
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,438	7,877
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	12	0
Loans to individuals [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	270		289
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	297		307
Related allowance	0		0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0		0
Average recorded investment	0	0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	271	247
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	1
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,864		9,333
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	10,741		9,952
Related allowance	496		1,282
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,841		3,533
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,435		3,585
Average recorded investment	3,161	2,457
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	8	4
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,825	8,516
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	49	37
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	7,348		13,606
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	8,423		14,719
Related allowance	47		84
Impaired Financing Receivable, with Related Allowance, Recorded Investment	301		488
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	315		612
Average recorded investment	307	6,704
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	25
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,498	33,978
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	$ 33	$ 11

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