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Loans and Allowance for Loan Losses - Impaired loans and interest recognized (Details 5) (Loans Receivable, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance $ 8,097   $ 8,097   $ 16,057
Loans without a specific valuation allowance, Unpaid Principal Balance 9,729   9,729   18,360
Loans without a specific valuation allowance Average Impaired Loans 11,428 18,105 13,756 21,321  
Loans without a specific valuation allowance, Interest Income Recognized 244 179 560 679  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance 4,275   4,275   2,157
Loans with a specific valuation allowance, Unpaid Principal Balance 4,279   4,279   2,171
Loans with a specific valuation allowance 857   857   318
Loans with a specific valuation allowance, Average Impaired Loans 4,299 3,315 2,352 3,809  
Loans with a specific valuation allowance, Interest Income Recognized 91 20 268 54  
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance 12,372   12,372   18,214
Total Unpaid Principal Balance 14,008   14,008   20,531
Total Specific Allowance 857   857   318
Total Average Impaired Loans 15,727 21,420 16,108 25,131  
Total Interest Income Recognized 335 199 828 733  
Commercial
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance           49
Loans without a specific valuation allowance, Unpaid Principal Balance 144   144   521
Loans without a specific valuation allowance Average Impaired Loans 3 63 19 698  
Loans without a specific valuation allowance, Interest Income Recognized          4  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance             
Loans with a specific valuation allowance, Unpaid Principal Balance             
Loans with a specific valuation allowance             
Loans with a specific valuation allowance, Average Impaired Loans    235    179  
Loans with a specific valuation allowance, Interest Income Recognized    5    7  
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance           49
Total Unpaid Principal Balance 144   144   521
Total Specific Allowance             
Total Average Impaired Loans 3 298 19 877  
Total Interest Income Recognized    5    11  
Owner Occupied 1-4
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance 906   906   1,421
Loans without a specific valuation allowance, Unpaid Principal Balance 1,019   1,019   1,535
Loans without a specific valuation allowance Average Impaired Loans 1,033 1,266 1,249 1,473  
Loans without a specific valuation allowance, Interest Income Recognized 24 17 21 77  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance 129   129   232
Loans with a specific valuation allowance, Unpaid Principal Balance 133   133   240
Loans with a specific valuation allowance 13   13   14
Loans with a specific valuation allowance, Average Impaired Loans 129 132 129 107  
Loans with a specific valuation allowance, Interest Income Recognized 2 2 2 4  
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance 1,035   1,035   1,653
Total Unpaid Principal Balance 1,152   1,152   1,775
Total Specific Allowance 13   13   14
Total Average Impaired Loans 1,162 1,393 1,378 1,580  
Total Interest Income Recognized 26 20 23 80  
Non-owner Occupied 1-4
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance 3,366   3,366   5,636
Loans without a specific valuation allowance, Unpaid Principal Balance 4,009   4,009   5,900
Loans without a specific valuation allowance Average Impaired Loans 4,549 6,176 5,136 6,627  
Loans without a specific valuation allowance, Interest Income Recognized 64 60 195 217  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance 282   282   281
Loans with a specific valuation allowance, Unpaid Principal Balance 282   282   281
Loans with a specific valuation allowance 30   30   27
Loans with a specific valuation allowance, Average Impaired Loans 292 340 284 369  
Loans with a specific valuation allowance, Interest Income Recognized 1 1 1 3  
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance 3,648   3,648   5,917
Total Unpaid Principal Balance 4,291   4,291   6,271
Total Specific Allowance 30   30   27
Total Average Impaired Loans 4,841 6,517 5,420 6,996  
Total Interest Income Recognized 65 61 196 221  
Multi-family
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance 533   533   2,813
Loans without a specific valuation allowance, Unpaid Principal Balance 552   552   2,865
Loans without a specific valuation allowance Average Impaired Loans 1,346 1,935 1,939 2,782  
Loans without a specific valuation allowance, Interest Income Recognized 22 29 80 122  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance           78
Loans with a specific valuation allowance, Unpaid Principal Balance           83
Loans with a specific valuation allowance           24
Loans with a specific valuation allowance, Average Impaired Loans    200    304  
Loans with a specific valuation allowance, Interest Income Recognized              
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance 533   533   2,891
Total Unpaid Principal Balance 552   552   2,948
Total Specific Allowance           24
Total Average Impaired Loans 1,346 2,135 1,939 3,086  
Total Interest Income Recognized 22 29 80 121  
Commercial Real Estate
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance 2,477   2,477   4,667
Loans without a specific valuation allowance, Unpaid Principal Balance 2,924   2,924   5,720
Loans without a specific valuation allowance Average Impaired Loans 3,663 7,301 4,423 7,952  
Loans without a specific valuation allowance, Interest Income Recognized 116 70 260 250  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance 3,769   3,769   1,566
Loans with a specific valuation allowance, Unpaid Principal Balance 3,769   3,769   1,567
Loans with a specific valuation allowance 767   767   253
Loans with a specific valuation allowance, Average Impaired Loans 3,778 2,405 1,889 2,849  
Loans with a specific valuation allowance, Interest Income Recognized 87 12 263 40  
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance 6,246   6,246   6,233
Total Unpaid Principal Balance 6,693   6,693   7,287
Total Specific Allowance 767   767   253
Total Average Impaired Loans 7,441 9,706 6,312 10,801  
Total Interest Income Recognized 203 81 523 290  
Construction
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance             
Loans without a specific valuation allowance, Unpaid Principal Balance             
Loans without a specific valuation allowance Average Impaired Loans              
Loans without a specific valuation allowance, Interest Income Recognized              
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance             
Loans with a specific valuation allowance, Unpaid Principal Balance             
Loans with a specific valuation allowance             
Loans with a specific valuation allowance, Average Impaired Loans              
Loans with a specific valuation allowance, Interest Income Recognized              
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance             
Total Unpaid Principal Balance             
Total Specific Allowance             
Total Average Impaired Loans              
Total Interest Income Recognized              
Land
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance 725   725   1,379
Loans without a specific valuation allowance, Unpaid Principal Balance 990   990   1,615
Loans without a specific valuation allowance Average Impaired Loans 725 1,206 890 1,612  
Loans without a specific valuation allowance, Interest Income Recognized 17 1    3  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance 95   95     
Loans with a specific valuation allowance, Unpaid Principal Balance 95   95     
Loans with a specific valuation allowance 47   47     
Loans with a specific valuation allowance, Average Impaired Loans 100    50     
Loans with a specific valuation allowance, Interest Income Recognized 1    2     
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance 820   820   1,379
Total Unpaid Principal Balance 1,085   1,085   1,615
Total Specific Allowance 47   47     
Total Average Impaired Loans 825 1,206 940 1,613  
Total Interest Income Recognized 18 1 2 4  
Consumer and Home Equity
          
Loans Without Specific Valuation Allowance [Abstract]          
Loans without a specific valuation allowance, Recorded Balance 90   90   92
Loans without a specific valuation allowance, Unpaid Principal Balance 91   91   114
Loans without a specific valuation allowance Average Impaired Loans 109 158 100 177  
Loans without a specific valuation allowance, Interest Income Recognized 1 2 4 6  
Loans With Specific Valuation Allowance [Abstract]          
Loans with a specific valuation allowance, Recorded Balance             
Loans with a specific valuation allowance, Unpaid Principal Balance             
Loans with a specific valuation allowance             
Loans with a specific valuation allowance, Average Impaired Loans    3    1  
Loans with a specific valuation allowance, Interest Income Recognized              
Loans With and With Out Specific Valuation Allowance [Abstract]          
Total Recorded Balance 90   90   92
Total Unpaid Principal Balance 91   91   114
Total Specific Allowance             
Total Average Impaired Loans 109 165 100 178  
Total Interest Income Recognized $ 1 $ 2 $ 4 $ 6