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Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net gain on sale of securities $ 208 $ (39) $ 113 $ 117 $ 213 $ 228 $ (9) $ 51 $ 399 $ 483 $ 5,264
Income before income taxes 7,760 7,951 7,972 10,537 12,396 15,381 6,075 8,853 34,220 42,705 29,601
Income tax (benefit) expense 2,436 2,539 2,537 3,396 3,957 5,322 1,997 2,852 10,908 14,128 9,573
Net income 5,324 5,412 5,435 7,141 8,439 10,059 4,078 6,001 23,312 28,577 20,028
Reclassified from AOCI, net of tax                 155 452 (1,729)
Available-for-Sale Securities
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from AOCI, net of tax                 (50) 285 (1,869)
Employee Benefit Plan
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from AOCI, net of tax                 205 167 140
Reclassification out of Accumulated Other Comprehensive Income
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Reclassified from AOCI, net of tax                 155 452 (1,729)
Reclassification out of Accumulated Other Comprehensive Income | Available-for-Sale Securities
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net gain on sale of securities                 (399) (483) (5,264)
Net impairment losses                 320 942 2,285
Income before income taxes                 (79) 459 (2,979)
Income tax (benefit) expense                 (29) 174 (1,110)
Net income                 (50) 285 (1,869)
Reclassification out of Accumulated Other Comprehensive Income | Employee Benefit Plan
                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Amortization of prior service cost                 277 [1] 223 [1] 223 [1]
Amortization of gains                 50 [1] 45 [1]  
Income before income taxes                 327 268 223
Income tax (benefit) expense                 122 101 83
Net income                 $ 205 $ 167 $ 140
[1] Amortization is included in net periodic pension cost. See Note 13, "Employee Benefit Plans."