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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost $ 245,322 $ 275,919 $ 281,740
Unrealized Gains 4,797 5,998 4,935
Unrealized Losses (1,775) (2,213) (5,896)
Fair Value (Estimated) 248,344 279,704 280,779
U.S. Government-sponsored agencies      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 75,991 92,341 92,332
Unrealized Gains 22 54 2
Unrealized Losses (1,571) (2,066) (5,271)
Fair Value (Estimated) 74,442 90,329 87,063
Mortgage-backed securities      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 45,287 57,003 61,138
Unrealized Gains 1,744 1,830 1,695
Unrealized Losses (53) (116) (587)
Fair Value (Estimated) 46,978 58,717 62,246
State and political subdivisions      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 123,744 126,275 127,970
Unrealized Gains 3,031 4,114 3,238
Unrealized Losses (151) (31) (38)
Fair Value (Estimated) 126,624 130,358 131,170
Corporate securities      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 300 300 300
Unrealized Gains 0 0 0
Unrealized Losses 0 0 0
Fair Value (Estimated) $ 300 $ 300 $ 300