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Comprehensive Income and Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of changes in accumulated other comprehensive income (AOCI)    
Balance at December 31, 2012, Changes in Net Unrealized Gains on Investment Securities Having No Credit Losses Recognized in the Consolidated statement of Income $ 2,966  
Balance at December 31, 2012, Changes in Net Unrealized Gains on Investment Securities Having Credit Losses Recognized in the Consolidated Statement of Income 13  
Balance at December 31, 2012, Total 2,979  
Other comprehensive income (loss) before reclassifications, Changes in Net Unrealized Gains on Investment Securities Having No Credit Losses Recognized in the Consolidated statement of Income (531)  
Other comprehensive income (loss) before reclassifications, Total (531)  
Total reclassifications, net of taxes (14) (223)
Amounts reclassified from accumulated other comprehensive income, Total (14)  
Total other comprehensive income (loss), net of taxes (545) (53)
Net current-period other comprehensive income (loss), Total (545)  
Balance at March 31, 2013, Changes in Net Unrealized Gains on Investment Securities Having No Credit Losses Recognized in the Consolidated statement of Income 2,421  
Balance at March 31, 2013, Changes in Net Unrealized Gains on Investment Securities Having Credit Losses Recognized in the Consolidated Statement of Income 13  
Balance at March 31, 2013, Total $ 2,434