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Parent Corporation Only Financial Statements (Condensed Statements of Comprehensive Income) (Details) (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
Other comprehensive (loss) income, net of tax:                      
Net income $ 4,984 $ 5,094 $ 4,923 $ 4,924 $ 4,469 $ 4,454 $ 4,353 $ 4,231 $ 19,925 $ 17,507 $ 13,926
Net unrealized loss on investment securities                 (7,994) 10,976 3,294
Actuarial gain                 387 (467) (1,065)
Total other comprehensive (loss) income                 (7,607) 10,509 2,229
Total comprehensive income                 12,318 28,016 16,155
Parent Company [Member]
                      
Other comprehensive (loss) income, net of tax:                      
Net income                 19,925 17,507 13,926
Net unrealized loss on investment securities                 79 41 (7)
Actuarial gain                 0 0 0
Total other comprehensive (loss) income                 79 41 (7)
Total comprehensive income                 79 41 (7)
Subsidiary of Common Parent [Member]
                      
Other comprehensive (loss) income, net of tax:                      
Net income                 19,925 17,507 13,926
Net unrealized loss on investment securities                 (8,073) 10,935 3,301
Actuarial gain                 387 (467) (1,065)
Total other comprehensive (loss) income                 (7,686) 10,468 2,236
Total comprehensive income                 $ 12,239 $ 27,975 $ 16,162