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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	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment		$ 50,844
Unpaid Principal Balance		61,835
Related Allowance		7,045
Average Recorded Investment		45,458	$ 49,794
Interest Income Recognized		615	625
Commercial, financial, agricultural and other with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		11,344
Unpaid Principal Balance		15,673
Average Recorded Investment		17,692	11,536
Interest Income Recognized		216	133
Real estate construction with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		28
Unpaid Principal Balance		117
Average Recorded Investment		95	1,190
Interest Income Recognized		0	19
Residential real estate with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		9,952
Unpaid Principal Balance		11,819
Average Recorded Investment		10,635	11,592
Interest Income Recognized		172	210
Commercial real estate with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		7,562
Unpaid Principal Balance		9,449
Average Recorded Investment		7,890	8,830
Interest Income Recognized		90	98
Loans to individuals with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		421
Unpaid Principal Balance		507
Average Recorded Investment		338	308
Interest Income Recognized		4	4
Subtotal with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		29,307
Unpaid Principal Balance		37,565
Average Recorded Investment		36,650	33,456
Interest Income Recognized		482	464
Commercial, financial, agricultural and other With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		20,132
Unpaid Principal Balance		22,590
Related Allowance		6,952
Average Recorded Investment		7,731	15,797
Interest Income Recognized		129	143
Real estate construction with an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment		0	0
Interest Income Recognized		0	0
Residential real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		461
Unpaid Principal Balance		672
Related Allowance		51
Average Recorded Investment		403	357
Interest Income Recognized		0	14
Commercial real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		944
Unpaid Principal Balance		1,008
Related Allowance		42
Average Recorded Investment		674	184
Interest Income Recognized		4	4
Loans to individuals With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		0
Unpaid Principal Balance		0
Related Allowance		0
Average Recorded Investment		0	0
Interest Income Recognized		0	0
Subtotal With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment		21,537
Unpaid Principal Balance		24,270
Related Allowance		7,045
Average Recorded Investment		8,808	16,338
Interest Income Recognized		$ 133	$ 161
Originated Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 41,226
Unpaid Principal Balance	56,296
Related Allowance	3,128
Average Recorded Investment	55,915
Interest Income Recognized	1,245
Originated Loans [Member] | Commercial, financial, agricultural and other with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	9,549
Unpaid Principal Balance	15,369
Average Recorded Investment	23,146
Interest Income Recognized	576
Originated Loans [Member] | Real estate construction with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Average Recorded Investment	4
Interest Income Recognized	44
Originated Loans [Member] | Residential real estate with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	10,873
Unpaid Principal Balance	13,004
Average Recorded Investment	10,957
Interest Income Recognized	312
Originated Loans [Member] | Commercial real estate with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	5,765
Unpaid Principal Balance	6,905
Average Recorded Investment	6,718
Interest Income Recognized	170
Originated Loans [Member] | Loans to individuals with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	382
Unpaid Principal Balance	507
Average Recorded Investment	409
Interest Income Recognized	15
Originated Loans [Member] | Subtotal with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	26,569
Unpaid Principal Balance	35,785
Average Recorded Investment	41,234
Interest Income Recognized	1,117
Originated Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	13,423
Unpaid Principal Balance	19,226
Related Allowance	2,530
Average Recorded Investment	13,885
Interest Income Recognized	99
Originated Loans [Member] | Real estate construction with an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Originated Loans [Member] | Residential real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	424
Unpaid Principal Balance	475
Related Allowance	164
Average Recorded Investment	241
Interest Income Recognized	4
Originated Loans [Member] | Commercial real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	810
Unpaid Principal Balance	810
Related Allowance	434
Average Recorded Investment	555
Interest Income Recognized	25
Originated Loans [Member] | Loans to individuals With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Originated Loans [Member] | Subtotal With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	14,657
Unpaid Principal Balance	20,511
Related Allowance	3,128
Average Recorded Investment	14,681
Interest Income Recognized	128
Acquired Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	587
Unpaid Principal Balance	661
Related Allowance	16
Average Recorded Investment	587
Interest Income Recognized	0
Acquired Loans [Member] | Commercial, financial, agricultural and other with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Average Recorded Investment	0
Interest Income Recognized	0
Acquired Loans [Member] | Real estate construction with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Average Recorded Investment	0
Interest Income Recognized	0
Acquired Loans [Member] | Residential real estate with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	406
Unpaid Principal Balance	480
Average Recorded Investment	406
Interest Income Recognized	0
Acquired Loans [Member] | Commercial real estate with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	162
Unpaid Principal Balance	162
Average Recorded Investment	162
Interest Income Recognized	0
Acquired Loans [Member] | Loans to individuals with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	3
Unpaid Principal Balance	3
Average Recorded Investment	3
Interest Income Recognized	0
Acquired Loans [Member] | Subtotal with no related allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	571
Unpaid Principal Balance	645
Average Recorded Investment	571
Interest Income Recognized	0
Acquired Loans [Member] | Commercial, financial, agricultural and other With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Acquired Loans [Member] | Real estate construction with an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Acquired Loans [Member] | Residential real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	16
Unpaid Principal Balance	16
Related Allowance	16
Average Recorded Investment	16
Interest Income Recognized	0
Acquired Loans [Member] | Commercial real estate With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Acquired Loans [Member] | Loans to individuals With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	0
Unpaid Principal Balance	0
Related Allowance	0
Average Recorded Investment	0
Interest Income Recognized	0
Acquired Loans [Member] | Subtotal With an allowance recorded [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment	16
Unpaid Principal Balance	16
Related Allowance	16
Average Recorded Investment	16
Interest Income Recognized	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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