Securities (Held-to-maturity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Total investment securities	$ 91,324	$ 236,283
Gross Unrealized Gains	9,160	9,554
Gross Unrealized Losses	0	(496)
Estimated Fair Value	100,484	245,341
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Total investment securities	91,324	236,283
Gross Unrealized Gains	9,160	9,554
Gross Unrealized Losses	0	(496)
Estimated Fair Value	$ 100,484	$ 245,341

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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-Name Accounting Standards Codification
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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

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