Securities (Held-to-maturity Securities, Debt Maturities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Due in 1 year or less	$ 583
Due in 1 to 5 years	31,156
Due in 5 to 10 years	111,690
Due after 10 years	92,854
Total investment securities	236,283	$ 253,550
Estimated Fair Value
Due in 1 year or less	589
Due in 1 to 5 years	31,759
Due in 5 to 10 years	115,342
Due after 10 years	97,651
Total investment securities	$ 245,341	$ 265,494

Amount of investment in debt security measured at amortized cost (held-to-maturity).

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