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Loans and Allowance for Loan Losses - Schedule of Changes in Allowance for Loan Losses and Recorded Investment in Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended					6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Other Loans [Member]	Dec. 31, 2013 Other Loans [Member]	Jun. 30, 2014 FUSB & ALC [Member]	Dec. 31, 2013 FUSB & ALC [Member]	Jun. 30, 2014 FUSB & ALC [Member] Commercial [Member]	Dec. 31, 2013 FUSB & ALC [Member] Commercial [Member]	Jun. 30, 2014 FUSB & ALC [Member] Commercial Real Estate [Member]	Dec. 31, 2013 FUSB & ALC [Member] Commercial Real Estate [Member]	Jun. 30, 2014 FUSB & ALC [Member] Consumer [Member]	Dec. 31, 2013 FUSB & ALC [Member] Consumer [Member]	Jun. 30, 2014 FUSB & ALC [Member] Residential Real Estate [Member]	Dec. 31, 2013 FUSB & ALC [Member] Residential Real Estate [Member]	Jun. 30, 2014 FUSB & ALC [Member] Other Loans [Member]	Dec. 31, 2013 FUSB & ALC [Member] Other Loans [Member]	Jun. 30, 2014 ALC [Member]	Dec. 31, 2013 ALC [Member]	Jun. 30, 2014 ALC [Member] Consumer [Member]	Dec. 31, 2013 ALC [Member] Consumer [Member]	Jun. 30, 2014 ALC [Member] Residential Real Estate [Member]	Dec. 31, 2013 ALC [Member] Residential Real Estate [Member]	Jun. 30, 2014 ALC [Member] Other Loans [Member]	Jun. 30, 2014 FUSB [Member]	Dec. 31, 2013 FUSB [Member]	Jun. 30, 2014 FUSB [Member] Commercial [Member]	Dec. 31, 2013 FUSB [Member] Commercial [Member]	Jun. 30, 2014 FUSB [Member] Commercial Real Estate [Member]	Dec. 31, 2013 FUSB [Member] Commercial Real Estate [Member]	Jun. 30, 2014 FUSB [Member] Consumer [Member]	Dec. 31, 2013 FUSB [Member] Consumer [Member]	Jun. 30, 2014 FUSB [Member] Residential Real Estate [Member]	Dec. 31, 2013 FUSB [Member] Residential Real Estate [Member]	Jun. 30, 2014 FUSB [Member] Other Loans [Member]	Dec. 31, 2013 FUSB [Member] Other Loans [Member]
Allowance for loan losses:
Beginning balance			$ 9,396					$ 9,396	$ 19,278	$ 592	$ 977	$ 4,852	$ 14,216	$ 2,847	$ 2,901	$ 1,092	$ 1,118	$ 13	$ 66	$ 3,124	$ 3,513	$ 2,667	$ 2,733	$ 457	$ 780		$ 6,272	$ 15,765	$ 592	$ 977	$ 4,852	$ 14,216	$ 180	$ 168	$ 635	$ 338	$ 13	$ 66
Charge-offs								2,827	13,131	268	537	876	8,055	1,508	3,329	175	1,210			1,588	3,504	1,492	2,979	96	525		1,239	9,627	268	537	876	8,055	16	350	79	685	0
Recoveries								953	3,891	203	141	221	2,747	503	970	25	29	1	4	449	895	432	874	17	21		504	2,996	203	141	221	2,747	71	96	8	8	1	4
Provision for loan losses	(264)	53	150	559				150	(642)	(228)	11	(36)	(4,056)	431	2,305	(3)	1,155	(14)	(57)	651	2,220	546	2,039	105	181		(501)	(2,862)	(228)	11	(36)	(4,056)	(115)	266	(108)	974	(14)	(57)
Ending balance	7,672		7,672					7,672	9,396	299	592	4,161	4,852	2,273	2,847	939	1,092		13	2,636	3,124	2,153	2,667	483	457		5,036	6,272	299	592	4,161	4,852	120	180	456	635	0	13
Ending balance individually evaluated for impairment								1,118	3,069		219	1,118	2,839				11										1,118	3,069	0	219	1,118	2,839	0		0	11	0
Ending balance collectively evaluated for impairment								6,554	6,327	299	373	3,043	2,013	2,273	2,847	939	1,081		13	2,636	3,124	2,153	2,667	483	457		3,918	3,203	299	373	3,043	2,013	120	180	456	624	0	13
Loan receivables:
Ending balance	286,690		286,690		315,433	976	604	286,690	315,433	17,385	37,772	150,328	156,634	62,237	58,824	55,764	61,599	976	604	77,934	75,559	53,766	48,938	24,168	26,621	0	208,756	239,874	17,385	37,772	150,328	156,634	8,471	9,886	31,596	34,978	976	604
Ending balance individually evaluated for impairment								11,157	32,551		753	11,157	28,813				2,985										11,157	32,551	0	753	11,157	28,813	0		0	2,985	0
Ending balance collectively evaluated for impairment								$ 275,533	$ 282,882	$ 17,385	$ 37,019	$ 139,171	$ 127,821	$ 62,237	$ 58,824	$ 55,764	$ 58,614	$ 976	$ 604	$ 77,934	$ 75,559	$ 53,766	$ 48,938	$ 24,168	$ 26,621		$ 197,599	$ 207,323	$ 17,385	$ 37,019	$ 139,171	$ 127,821	$ 8,471	$ 9,886	$ 31,596	$ 31,993	$ 976	$ 604

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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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