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Securities - Amortized Cost and Estimated Fair Value of Securities - Securities Held-to-maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Securities held-to-maturity:    
Amortized Cost $ 341,383 $ 324,010
Gross Unrealized Gains 666 536
Gross Unrealized Losses (5,259) (5,798)
Estimated Fair Value 336,790 318,748
Agency mortgage-backed securities    
Securities held-to-maturity:    
Amortized Cost 251,162 233,409
Gross Unrealized Gains 27 15
Gross Unrealized Losses (3,302) (3,554)
Estimated Fair Value 247,887 229,870
Municipals - exempt from Federal tax    
Securities held-to-maturity:    
Amortized Cost 90,221 90,601
Gross Unrealized Gains 639 521
Gross Unrealized Losses (1,957) (2,244)
Estimated Fair Value $ 88,903 $ 88,878