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Derivatives - Fair Value Hedges on Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Reported interest income on tax-exempt securities	$ 259	$ 283
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedging relationship	(4,008)	(6,885)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest income on tax-exempt securities	564	440
Effects of fair value hedge relationships	(305)	(157)
Reported interest income on tax-exempt securities	259	283
Gain (loss) on fair value hedging relationship	$ 4,008	$ 6,885

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

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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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-Topic 942
-SubTopic 220
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