Loans - Transactions in Allowance for loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan Losses:
Beginning Balance	$ 8,934	$ 8,857	$ 8,136
Charge-offs	(7,730)	(10,122)	(3,676)
Recoveries	598	538	133
Provision	7,404us-gaap_ProvisionForLoanLossesExpensed	9,661us-gaap_ProvisionForLoanLossesExpensed	4,264us-gaap_ProvisionForLoanLossesExpensed
Ending Balance	9,206	8,934	8,857
Individually evaluated for impairment	3,743	3,785	4,115
Collectively evaluated for impairment	5,463	5,149	4,742
Individually evaluated for impairment, Total	55,390	52,704	86,234
Collectively evaluated for impairment, Total	307,017	322,645	344,849
Gaming [Member]
Allowance for Loan Losses:
Beginning Balance	977	1,541	457
Charge-offs	(992)	(474)	(275)
Recoveries	260	110
Provision	328	(200)	1,359
Ending Balance	573	977	1,541
Individually evaluated for impairment		626	1,100
Collectively evaluated for impairment	573	351	441
Individually evaluated for impairment, Total		3,095	20,357
Collectively evaluated for impairment, Total	31,353	26,475	39,830
Residential and Land Development [Member]
Allowance for Loan Losses:
Beginning Balance	776	200	1,081
Charge-offs	(2,060)	(7,325)	(1,103)
Recoveries		67
Provision	1,535	7,834	222
Ending Balance	251	776	200
Individually evaluated for impairment		471
Collectively evaluated for impairment	251	305	200
Individually evaluated for impairment, Total	7,232	13,624	21,165
Collectively evaluated for impairment, Total	2,887	5,779	6,173
Real Estate, Construction [Member]
Allowance for Loan Losses:
Beginning Balance	695	967	937
Charge-offs	(127)	(1,013)	(474)
Recoveries	35	97
Provision	257	644	504
Ending Balance	860	695	967
Individually evaluated for impairment	742	615	922
Collectively evaluated for impairment	118	80	45
Individually evaluated for impairment, Total	6,830	5,399	8,267
Collectively evaluated for impairment, Total	27,180	39,588	44,319
Real Estate, Mortgage [Member]
Allowance for Loan Losses:
Beginning Balance	5,553	5,273	4,800
Charge-offs	(368)	(1,048)	(1,348)
Recoveries	193	150	7
Provision	1,231	1,178	1,814
Ending Balance	6,609	5,553	5,273
Individually evaluated for impairment	2,706	1,698	1,758
Collectively evaluated for impairment	3,903	3,855	3,515
Individually evaluated for impairment, Total	39,204	28,094	33,848
Collectively evaluated for impairment, Total	201,137	209,064	212,572
Commercial and Industrial [Member]
Allowance for Loan Losses:
Beginning Balance	632	593	557
Charge-offs	(3,948)	(24)	(203)
Recoveries	20	26	41
Provision	3,883	37	198
Ending Balance	587	632	593
Individually evaluated for impairment	289	342	300
Collectively evaluated for impairment	298	290	293
Individually evaluated for impairment, Total	2,035	2,423	2,525
Collectively evaluated for impairment, Total	29,871	32,584	32,479
Other [Member]
Allowance for Loan Losses:
Beginning Balance	301	283	304
Charge-offs	(235)	(238)	(273)
Recoveries	90	88	85
Provision	170	168	167
Ending Balance	326	301	283
Individually evaluated for impairment	6	33	35
Collectively evaluated for impairment	320	268	248
Individually evaluated for impairment, Total	89	69	72
Collectively evaluated for impairment, Total	$ 14,589	$ 9,155	$ 9,476

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to loss from loan transactions.

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