Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income $ 15,429 $ 12,426 $ 11,970
Securities available for sale:      
Unrealized holding gain (loss) on securities available for sale 7,989 6,933 (1,919)
Reclassification adjustment for gain realized in income (9,636) [1] (5,568) [1] (4,464) [1]
Net unrealized (loss) gain (1,647) 1,365 (6,383)
Tax effect 646 (489) 2,511
Net-of-tax amount (1,001) 876 (3,872)
Reclassification adjustments :      
Amortization of prior service cost 28,000 17,000  
Net unrealized (loss) gain (1,647) 1,365 (6,383)
Tax effect 646 (489) 2,511
Net-of-tax amount (1,001) 876 (3,872)
Total other comprehensive (loss) income (811) 930 (4,053)
Comprehensive income 14,618 13,356 7,917
Supplemental Director Retirement Plan [Member]
      
Securities available for sale:      
Net unrealized (loss) gain 226 82 (259)
Net-of-tax amount 147 58 (171)
Reclassification adjustments :      
Amortization of prior service cost 28 28 28
Amortization of unrecognized loss 61 68  
Actuarial net gain (loss) arising during the year 137 (14) (287)
Net unrealized (loss) gain 226 82 (259)
Tax effect (79) (24) 88
Net-of-tax amount 147 58 (171)
Comprehensive income (166) (392)  
Long-Term Health Care Plan [Member]
      
Securities available for sale:      
Net unrealized (loss) gain 66 (12) (15)
Tax effect (23) 8 5
Net-of-tax amount 43 (4) (10)
Reclassification adjustments :      
Amortization of prior service cost 17 18 18
Amortization of unrecognized loss 5 26  
Actuarial net gain (loss) arising during the year 44 (56) (33)
Net unrealized (loss) gain 66 (12) (15)
Tax effect (23) 8 5
Net-of-tax amount 43 (4) (10)
Comprehensive income $ (361) $ (427)  
[1] Amounts are included in gain on sales of securities, net in the Consolidated Statements of Net Income. Provision for income tax associated with the reclassification adjustment for the years ended December 31, 2013, 2012 and 2011 was $3.8 million, $2.0 million and $1.8 million, respectively.