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Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 86,818	$ 22,640
Change in debt securities available-for-sale:
Unrealized holding gains (losses) for the period	(73,514)	103,954
Reclassification adjustment for securities (gains) losses realized in income	(1,993)	(5,174)
Income tax effect	16,667	(22,411)
Unrealized gains (losses) on available-for-sale debt securities	(58,840)	76,369
Cash flow hedges:
Net unrealized derivative gains (losses) on cash flow hedges	4,048	7,803
Reclassification adjustment for (gains) losses realized in net income	(149)	(431)
Income tax effect	(958)	(1,811)
Changes from cash flow hedges	2,941	5,561
Defined benefit pension plans:
Amortization of net loss recognized in income	49	27
Income tax effect	(12)	(7)
Changes from defined benefit pension plans	37	20
Other comprehensive income (loss), net of tax	(55,862)	81,950
Comprehensive income	$ 30,956	$ 104,590

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- Definition

Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 715
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17A
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580

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- Definition

Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
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-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

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- References

No definition available.

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