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Derivatives - Fair Value Hedges on Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Reported interest income on tax-exempt securities	$ 416	$ 411	$ 699	$ 836
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap agreements - securities:	205	1,348	3,644	2,237
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest income on tax-exempt securities	580	449	1,020	906
Effects of fair value hedge relationships	(164)	(38)	(321)	(70)
Reported interest income on tax-exempt securities	416	411	699	836
Interest rate swap agreements - securities:	$ (205)	$ (1,348)	$ (3,644)	$ (2,237)

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Interest Income, Securities, Operating, Tax Exempt, Gross

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 4C
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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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-SubTopic 220
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