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Other Comprehensive Income (Loss) - Other Comprehensive Income (Loss) Components and Related Tax Effects (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]    
Balances at beginning of period, net of tax $ (19,220) $ (19,998)
Other comprehensive income before reclassifications 6,528 3,897
Amortization of unrealized gains of postretirement plan recognized in other comprehensive income (181)  
Accretion of unrealized losses of securities transferred from available for sale to held to maturity recognized in other comprehensive income 34  
Reclassification adjustment for gains realized in income (99) (7)
Total other comprehensive income 6,282 3,890
Balances at end of period, net of tax (12,938) (16,108)
Unrealized Gains (Losses) on Securities Available for Sale [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balances at beginning of period, net of tax (2,492) (4,315)
Other comprehensive income before reclassifications 6,528 3,897
Reclassification adjustment for gains realized in income (99) (7)
Total other comprehensive income 6,429 3,890
Balances at end of period, net of tax 3,937 (425)
Disproportionate Tax Effect from Securities Available for Sale [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balances at beginning of period, net of tax (17,110) (17,110)
Balances at end of period, net of tax (17,110) (17,110)
Losses on Securities Transferred From Available for Sale to Held to Maturity [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balances at beginning of period, net of tax (960)  
Accretion of unrealized losses of securities transferred from available for sale to held to maturity recognized in other comprehensive income 34  
Total other comprehensive income 34  
Balances at end of period, net of tax (926)  
Unrealized Gains (Losses) from Postretirement Plan [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balances at beginning of period, net of tax 831 916
Amortization of unrealized gains of postretirement plan recognized in other comprehensive income (181)  
Total other comprehensive income (181)  
Balances at end of period, net of tax 650 916
Disproportionate Tax Effect from Postretirement Plan [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balances at beginning of period, net of tax 511 511
Balances at end of period, net of tax $ 511 $ 511