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Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Components and Related Tax Effects (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance     $ 244,245,000 $ 240,135,000
Transfer losses from available for sale to held to maturity   $ (999,000)    
Other comprehensive income before reclassifications $ (1,227,000) 5,138,000 9,895,000 3,098,000
Amortization of unrealized gains of postretirement plan recognized in other comprehensive income (289,000)   (651,000)  
Accretion of unrealized losses of securities transferred from available for sale to held to maturity recognized in other comprehensive income 47,000   118,000  
Reclassification adjustment for gains realized in income (142,000)   (393,000) (7,000)
Total other comprehensive income (1,611,000) 5,138,000 8,969,000 3,091,000
Balance 256,403,000 243,929,000 256,403,000 243,929,000
Unrealized Gains (Losses) on Securities Available for Sale [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance 8,379,000 (6,362,000) (2,492,000) (4,315,000)
Transfer losses from available for sale to held to maturity   999,000   999,000
Other comprehensive income before reclassifications (1,227,000) 5,138,000 9,895,000 3,098,000
Reclassification adjustment for gains realized in income (142,000)   (393,000) (7,000)
Total other comprehensive income (1,369,000) 5,138,000 9,502,000 3,091,000
Balance 7,010,000 (225,000) 7,010,000 (225,000)
Disproportionate Tax Effect from Securities Available for Sale [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance (17,110,000) (17,110,000) (17,110,000) (17,110,000)
Balance (17,110,000) (17,110,000) (17,110,000) (17,110,000)
Losses on Securities Transferred From Available for Sale to Held to Maturity [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance (889,000)   (960,000)  
Transfer losses from available for sale to held to maturity   (999,000)   (999,000)
Accretion of unrealized losses of securities transferred from available for sale to held to maturity recognized in other comprehensive income 47,000   118,000  
Total other comprehensive income 47,000   118,000  
Balance (842,000) (999,000) (842,000) (999,000)
Unrealized Gains (Losses) from Postretirement Plan [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance 469,000 916,000 831,000 916,000
Amortization of unrealized gains of postretirement plan recognized in other comprehensive income (289,000)   (651,000)  
Total other comprehensive income (289,000)   (651,000)  
Balance 180,000 916,000 180,000 916,000
Disproportionate Tax Effect from Postretirement Plan [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance 511,000 511,000 511,000 511,000
Balance 511,000 511,000 511,000 511,000
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance (8,640,000) (22,045,000) (19,220,000) (19,998,000)
Total other comprehensive income     8,969,000 3,091,000
Balance $ (10,251,000) $ (16,907,000) $ (10,251,000) $ (16,907,000)