Loans - Impaired Loans, Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	$ 31,608	$ 17,119	$ 51,863
With no related allowance recorded, Recorded Investment	27,034	16,520	50,668
With no related allowance recorded, Related Allowance	0	0	0
With no related allowance recorded, Average Recorded Investment	29,244	16,305	50,602
With no related allowance recorded, Interest Income Recognized	26	76	23
With a related allowance recorded, Unpaid Principal Balance	7,700	30,136	14,682
With a related allowance recorded, Recorded Investment	7,101	21,232	14,074
With a related allowance recorded, Related Allowance	2,557	2,544	3,074
With no related allowance recorded, Average Recorded Investment	7,111	27,265	11,863
With a related allowance recorded, Interest Income Recognized	9	329	327
Total by class of loans, Unpaid Principal Balance	39,308	47,255	66,545
Total by class of loans, Recorded Investment	34,135	37,752	64,742
Total by class of loans, Related Allowance	2,557	2,544	3,074
Total by class of loans, Average Recorded Investment	36,355	43,570	62,465
Total by class of loans, Interest Income Recognized	35	405	350
Residential and Land Development [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	9,513	4,425	21,837
With no related allowance recorded, Recorded Investment	8,233	4,425	20,733
With no related allowance recorded, Related Allowance	0	0	0
With no related allowance recorded, Average Recorded Investment	8,380	4,465	21,288
With a related allowance recorded, Unpaid Principal Balance		17,576	350
With a related allowance recorded, Recorded Investment		9,147	350
With a related allowance recorded, Related Allowance		471	70
With no related allowance recorded, Average Recorded Investment		15,909	350
Total by class of loans, Unpaid Principal Balance	9,513	22,001	22,187
Total by class of loans, Recorded Investment	8,233	13,572	21,083
Total by class of loans, Related Allowance		471	70
Total by class of loans, Average Recorded Investment	8,380	20,374	21,638
Total by class of loans, Interest Income Recognized
Real Estate, Construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	2,198	2,294	4,635
With no related allowance recorded, Recorded Investment	2,178	2,294	4,580
With no related allowance recorded, Related Allowance	0	0	0
With no related allowance recorded, Average Recorded Investment	2,222	2,054	3,833
With no related allowance recorded, Interest Income Recognized		26
With a related allowance recorded, Unpaid Principal Balance	1,109	1,185	1,694
With a related allowance recorded, Recorded Investment	1,109	1,185	1,686
With a related allowance recorded, Related Allowance	422	337	663
With no related allowance recorded, Average Recorded Investment	1,115	1,239	1,314
With a related allowance recorded, Interest Income Recognized		23	8
Total by class of loans, Unpaid Principal Balance	3,307	3,479	6,329
Total by class of loans, Recorded Investment	3,287	3,479	6,266
Total by class of loans, Related Allowance	422	337	663
Total by class of loans, Average Recorded Investment	3,337	3,293	5,147
Total by class of loans, Interest Income Recognized		49	8
Real Estate, Mortgage [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	19,517	9,722	9,971
With no related allowance recorded, Recorded Investment	16,243	9,123	9,935
With no related allowance recorded, Related Allowance	0	0	0
With no related allowance recorded, Average Recorded Investment	18,258	9,097	9,821
With no related allowance recorded, Interest Income Recognized	26	26
With a related allowance recorded, Unpaid Principal Balance	6,591	9,677	10,893
With a related allowance recorded, Recorded Investment	5,992	9,677	10,293
With a related allowance recorded, Related Allowance	2,135	1,110	1,229
With no related allowance recorded, Average Recorded Investment	5,996	8,801	10,199
With a related allowance recorded, Interest Income Recognized	9	306	319
Total by class of loans, Unpaid Principal Balance	26,108	19,399	20,864
Total by class of loans, Recorded Investment	22,235	18,800	20,228
Total by class of loans, Related Allowance	2,135	1,110	1,229
Total by class of loans, Average Recorded Investment	24,254	17,898	20,020
Total by class of loans, Interest Income Recognized	35	332	319
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance	380	678	892
With no related allowance recorded, Recorded Investment	380	678	892
With no related allowance recorded, Related Allowance	0	0	0
With no related allowance recorded, Average Recorded Investment	384	689	791
With no related allowance recorded, Interest Income Recognized		24	23
With a related allowance recorded, Unpaid Principal Balance			24
With a related allowance recorded, Recorded Investment			24
With a related allowance recorded, Related Allowance			12
Total by class of loans, Unpaid Principal Balance	380	678	916
Total by class of loans, Recorded Investment	380	678	916
Total by class of loans, Related Allowance			12
Total by class of loans, Average Recorded Investment	384	689	791
Total by class of loans, Interest Income Recognized		24	23
Gaming [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Unpaid Principal Balance			14,528
With no related allowance recorded, Recorded Investment			14,528
With no related allowance recorded, Related Allowance			0
With no related allowance recorded, Average Recorded Investment			14,869
With a related allowance recorded, Unpaid Principal Balance		1,698	1,721
With a related allowance recorded, Recorded Investment		1,223	1,721
With a related allowance recorded, Related Allowance		626	1,100
With no related allowance recorded, Average Recorded Investment		1,316
Total by class of loans, Unpaid Principal Balance		1,698	16,249
Total by class of loans, Recorded Investment		1,223	16,249
Total by class of loans, Related Allowance		626	1,100
Total by class of loans, Average Recorded Investment		1,316	14,869
Total by class of loans, Interest Income Recognized

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

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-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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