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Loans (Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2012
Commercial [Member]
Risk Code 4 - Watch [Member]
Jun. 30, 2012
Commercial [Member]
Risk Code 4 - Watch [Member]
Jun. 30, 2012
Commercial [Member]
Risk Code 5 - Special Mention [Member]
Dec. 31, 2011
Commercial [Member]
Risk Code 5 - Special Mention [Member]
Jun. 30, 2011
Commercial [Member]
Risk Code 5 - Special Mention [Member]
Jun. 30, 2010
Commercial [Member]
Risk Code 5 - Special Mention [Member]
Dec. 31, 2011
Commercial [Member]
Risk Code 5 - Special Mention [Member]
Jun. 30, 2012
Commercial [Member]
Risk Code 6 - Substandard [Member]
Dec. 31, 2011
Commercial [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2011
Commercial [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2012
Commercial [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2012
Commercial [Member]
Risk Code 7 - Doubtful [Member]
Dec. 31, 2011
Commercial [Member]
Risk Code 7 - Doubtful [Member]
Jun. 30, 2011
Commercial [Member]
Risk Code 7 - Doubtful [Member]
Jun. 30, 2010
Commercial [Member]
Risk Code 7 - Doubtful [Member]
Dec. 31, 2011
Commercial [Member]
Risk Code 7 - Doubtful [Member]
Jun. 30, 2012
Commercial [Member]
Risk Code 8 - Loss [Member]
Jun. 30, 2012
Real Estate Construction [Member]
Risk Code 3 - Satisfactory [Member]
Jun. 30, 2012
Real Estate Construction [Member]
Risk Code 6 - Substandard [Member]
Dec. 31, 2011
Real Estate Construction [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2011
Real Estate Construction [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2012
Real Estate Term [Member]
Risk Code 5 - Special Mention [Member]
Dec. 31, 2011
Real Estate Term [Member]
Risk Code 5 - Special Mention [Member]
Jun. 30, 2012
Real Estate Term [Member]
Risk Code 6 - Substandard [Member]
Dec. 31, 2011
Real Estate Term [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2011
Real Estate Term [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2012
Real Estate Term [Member]
Risk Code 7 - Doubtful [Member]
Dec. 31, 2011
Real Estate Term [Member]
Risk Code 7 - Doubtful [Member]
Jun. 30, 2012
Home Equity Lines And Other Consumer [Member]
Risk Code 4 - Watch [Member]
Dec. 31, 2011
Home Equity Lines And Other Consumer [Member]
Risk Code 5 - Special Mention [Member]
Jun. 30, 2012
Home Equity Lines And Other Consumer [Member]
Risk Code 6 - Substandard [Member]
Dec. 31, 2011
Home Equity Lines And Other Consumer [Member]
Risk Code 6 - Substandard [Member]
Jun. 30, 2011
Home Equity Lines And Other Consumer [Member]
Risk Code 6 - Substandard [Member]
Financing Receivable, Impaired [Line Items]                                                                        
Recorded Investment $ 14,196 $ 9,452 $ 12,689 $ 192 $ 192 $ 294 $ 327 $ 3,327   $ 327 $ 1,824 $ 2,677 $ 1,051 $ 1,824 $ 423 $ 669 $ 465   $ 669   $ 2,827 $ 843 $ 2,355 $ 2,949 $ 1,074 $ 170 $ 6,113 $ 2,659 $ 4,688 $ 172 $ 446 $ 94 $ 97 $ 340 $ 52 $ 209
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 10,188 6,616 10,157 192 192 294 327   3,327 327 1,559 2,166 552 1,559             2,827   1,349 1,381 1,074 170 4,035 2,455 4,688     94 97 113 52 209
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,008 2,836 2,532               265 511 499 265 423 669   465 669     843 1,006 1,568     2,078 204   172 446     227    
Unpaid Principal Balance 15,696 10,442 13,501 192 192 294 327 3,925   327 2,468 3,321 1,051 2,468 423 669 465   669 224 2,827 843 2,533 3,073 1,152 248 6,393 2,749 4,778 446 446 94 97 340 52 209
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 11,134 7,606 10,924 192 192 294 327   3,925 327 2,203 2,810 552 2,203           224 2,827   1,527 1,460 1,152 248 4,035 2,545 4,778     94 97 113 52 209
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 4,562 2,836 2,577               265 511 499 265 423 669   465 669     843 1,006 1,613     2,358 204   446 446     227    
Related Allowance 921 1,181 696               141 44 183 141 401 576 456 456 576     263 494 57     61 5   6 62     49    
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 10,732 6,939 10,307 260   285     3,423 430 1,822 2,380 596             112 2,900   1,463 1,407 1,068 193 4,071 2,371 4,718     96 49 118 53 163
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 4,573 3,080 2,726                 687 678 280 434     475 707     924 1,024 1,573     2,398 215   309 447     228    
Average Recorded Investment 15,305 10,019 13,033   260 285 430 3,423     2,102 3,067 1,274   434 707 475     112 2,900 924 2,487 2,980 1,068 193 6,469 2,586 4,718 309 447 96 49 346 53 163
Interest Income Recognized 360 135 89   7 11 23 17     6 5 19               134     9 32   163 102 42     3 5 4   2
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method $ 360 $ 135 $ 89 $ 7   $ 11     $ 17 $ 23 $ 6 $ 5 $ 19               $ 134     $ 9 $ 32   $ 163 $ 102 $ 42     $ 3 $ 5 $ 4   $ 2