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Investment Securities Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Investment securities available for sale:      
Total $ 281,156 $ 200,758 $ 235,154
Unrealized Gain 1,096 1,667 1,441
Unrealized Loss (1,818) (787) (1,479)
Investment securities available for sale 280,434 201,638 235,116
Municipal bonds      
Investment securities available for sale:      
Total 120,392 88,599 84,576
Unrealized Gain 784 1,235 1,211
Unrealized Loss (745) (173) (354)
Investment securities available for sale 120,431 89,661 85,433
Mortgage-backed securities      
Investment securities available for sale:      
Total 160,764 112,159 150,578
Unrealized Gain 312 432 230
Unrealized Loss (1,073) (614) (1,125)
Investment securities available for sale $ 160,003 $ 111,977 $ 149,683