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Investment Securities - Income Earned on Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Non-taxable:
Total	$ 15,367	$ 14,640	$ 49,273	$ 41,558
Held-to-maturity
Taxable:
Taxable	248	528	975	1,641
Non-taxable:
Non-taxable	83	1,828	1,334	5,661
Available-for-sale
Taxable:
Taxable	10,166	10,364	34,422	29,614
Non-taxable:
Non-taxable	$ 4,870	$ 1,920	$ 12,542	$ 4,642

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Interest income, securities, operating, by non-0taxable status [abstract]

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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