Investments - Summary of Company's Investment Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investment Securities [Line Items]
Amortized Cost	$ 121,269	$ 122,841
Gross Unrealized Gains	5,495	8,222
Gross Unrealized Losses	(2,026)	(350)
Fair Value	124,738	130,713
Mutual Fund Amortized Cost	9,901	7,501
Mutual Fund Gross Unrealized Gains	790	832
Mutual Fund Gross Unrealized Losses	(1)
Mutual Fund Fair value	10,690	8,333
Total Amortized Cost	131,170	130,342
Total Gross Unrealized Gains	6,285	9,054
Total Gross Unrealized Losses	(2,027)	(350)
Total Fair Value	135,428	139,046
U.S. Government and Agencies [Member]
Investment Securities [Line Items]
Amortized Cost	11,002	11,202
Gross Unrealized Gains	594	908
Fair Value	11,596	12,110
State [Member]
Investment Securities [Line Items]
Amortized Cost	697	3,994
Gross Unrealized Gains	27	117
Fair Value	724	4,111
Political Subdivisions [Member]
Investment Securities [Line Items]
Amortized Cost	1,602	753
Gross Unrealized Gains	66	37
Fair Value	1,668	790
Revenue and Assessment [Member]
Investment Securities [Line Items]
Amortized Cost	15,557	16,449
Gross Unrealized Gains	630	1,553
Gross Unrealized Losses	(115)	(6)
Fair Value	16,072	17,996
Corporate Bonds [Member]
Investment Securities [Line Items]
Amortized Cost	75,083	68,114
Gross Unrealized Gains	2,521	3,669
Gross Unrealized Losses	(1,911)	(246)
Fair Value	75,693	71,537
Agency Backed [Member]
Investment Securities [Line Items]
Amortized Cost	5,892	11,079
Gross Unrealized Gains	350	791
Fair Value	6,242	11,870
Non-Agency Backed - Residential [Member]
Investment Securities [Line Items]
Amortized Cost	5,763	5,098
Gross Unrealized Gains	620	472
Gross Unrealized Losses		(98)
Fair Value	6,383	5,472
Non-Agency Backed - Commercial [Member]
Investment Securities [Line Items]
Amortized Cost	4,173	4,652
Gross Unrealized Gains	628	457
Fair Value	4,801	5,109
Redeemable Preferred Stocks [Member]
Investment Securities [Line Items]
Amortized Cost	1,500	1,500
Gross Unrealized Gains	59	218
Fair Value	$ 1,559	$ 1,718