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Derivative Financial Instruments - Fair value gains and losses on derivative financial instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary of the fair value gains and losses on derivative financial instruments
Net fair value (losses) gains on derivative financial instruments	$ (944)	$ 954
Realized losses on derivatives	4,261	(1,425)
Interest rate lock commitments
Summary of the fair value gains and losses on derivative financial instruments
Net fair value (losses) gains on derivative financial instruments	(4,437)	3,342
Forward Commitments
Summary of the fair value gains and losses on derivative financial instruments
Net fair value (losses) gains on derivative financial instruments	3,396	(2,311)
Customer derivatives - interest rate swaps
Summary of the fair value gains and losses on derivative financial instruments
Net fair value (losses) gains on derivative financial instruments	$ 97	$ (77)

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- Definition

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.

+ References

No definition available.

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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