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Investment Securities - By Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Amortized Cost      
One Year or Less $ 1,422    
More than One Year to Five Years 27,576    
More than Five Years to Ten Years 72,213    
More than Ten Years 175,607    
Total 276,818    
Fair Value      
One Year or Less 1,423    
More than One Year to Five Years 27,886    
More than Five Years to Ten Years 73,594    
More than Ten Years 176,420    
Total 279,323    
Amortized Cost      
One Year or Less 1,422    
More than One Year to Five Years 27,576    
More than Five Years to Ten Years 72,213    
More than Ten Years 166,017    
Total 267,228 $ 279,711 $ 278,278
Fair Value      
One Year or Less 1,423    
More than One Year to Five Years 27,886    
More than Five Years to Ten Years 73,594    
More than Ten Years 166,808    
Total 269,711 280,273 280,461
Amortized Cost      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 9,590    
Amortized Cost 9,590 9,642 0
Fair Value      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 9,612    
Total 9,612 9,572  
Municipal bonds      
Amortized Cost      
One Year or Less 1,422    
More than One Year to Five Years 27,576    
More than Five Years to Ten Years 43,199    
More than Ten Years 51,287    
Total 123,484 128,546 103,997
Fair Value      
One Year or Less 1,423    
More than One Year to Five Years 27,886    
More than Five Years to Ten Years 44,398    
More than Ten Years 52,175    
Total 125,882 130,245 105,523
Collateralized mortgage obligation      
Amortized Cost      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 23,805    
Total 23,805 24,722 11,204
Fair Value      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 23,866    
Total 23,866 24,543 11,288
Mortgage-backed securities      
Amortized Cost      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 29,014    
More than Ten Years 90,925    
Total 119,939 126,443 163,077
Fair Value      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 29,196    
More than Ten Years 90,767    
Total 119,963 125,485 $ 163,650
Amortized Cost      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 8,361    
Amortized Cost 8,361 8,400  
Fair Value      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 8,383    
Total 8,383 $ 8,330  
Other      
Amortized Cost      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 1,229    
Amortized Cost 1,229    
Fair Value      
One Year or Less 0    
More than One Year to Five Years 0    
More than Five Years to Ten Years 0    
More than Ten Years 1,229    
Total $ 1,229