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Bank subsidiary (Details 8) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Pass
Dec. 31, 2013
Pass
Mar. 31, 2014
Pass
Minimum
grade
Mar. 31, 2014
Pass
Maximum
grade
Mar. 31, 2014
Special mention
Dec. 31, 2013
Special mention
Mar. 31, 2014
Substandard
Dec. 31, 2013
Substandard
Mar. 31, 2014
Doubtful
Dec. 31, 2013
Doubtful
Credit risk profile by internally assigned grade for loans                        
Categorization of loan grades considered pass grades         1 6            
Commercial real estate $ 452,303 $ 440,443 $ 393,888 $ 375,217     $ 25,651 $ 33,436 $ 29,014 $ 28,020 $ 3,750 $ 3,770
Commercial construction 66,578 52,112 66,578 52,112       0 0      
Commercial $ 786,611 $ 783,388 $ 708,268 $ 703,053     $ 20,315 $ 17,634 $ 55,079 $ 59,663 $ 2,949 $ 3,038