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Benefit Plans - Schedule of Changes in Plan Benefit Obligation and Fair Value of Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in Plan Assets      
Fair value of assets, end of year $ 4,329 $ 4,046 $ 3,454
Pension Plans, Defined Benefit [Member]
      
Change in Benefit Obligation      
Benefit obligation, beginning of year 7,244 5,995 5,588
Service cost 470 427 359
Interest cost 279 269 307
Actuarial (gain) loss (1,327) 725 871
Benefits paid (961) (172) (1,097)
Gain due to settlement (204)   (33)
Benefit obligation, end of year 5,501 7,244 5,995
Changes in Plan Assets      
Fair value of plan assets, beginning of year 4,046 3,454 4,284
Actual return on plan assets 744 458 27
Employer contributions 500 306 240
Benefits paid (961) (172) (1,097)
Fair value of assets, end of year 4,329 4,046 3,454
Funded Status, end of year (1,172) (3,198) (2,541)
Amount Recognized in Other Liabilities $ (1,172) $ (3,198) $ (2,541)