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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
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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

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