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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost $ 216,272 $ 240,023 $ 249,250
Unrealized Gains 8,952 5,545 3,671
Unrealized Losses (24) (2,445) (4,223)
Fair Value (Estimated) 225,200 243,123 248,698
U.S. Government-sponsored agencies      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 35,962 71,000 75,982
Unrealized Gains 31 40 45
Unrealized Losses 0 (2,284) (3,035)
Fair Value (Estimated) 35,993 68,756 72,992
Mortgage-backed securities      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 37,096 42,193 48,655
Unrealized Gains 1,651 1,305 1,650
Unrealized Losses (24) (136) (125)
Fair Value (Estimated) 38,723 43,362 50,180
State and political subdivisions      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 138,914 122,530 124,313
Unrealized Gains 7,270 4,200 1,976
Unrealized Losses 0 (25) (1,063)
Fair Value (Estimated) 146,184 126,705 125,226
Corporate securities      
Schedule of Held-to-maturity Securities [Line Items]      
Amortized Cost 4,300 4,300 300
Unrealized Gains 0 0 0
Unrealized Losses 0 0 0
Fair Value (Estimated) $ 4,300 $ 4,300 $ 300