Residential mortgage banking activities and variable expenses on residential mortgage banking activities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Residential mortgage banking activities
Realized and unrealized gains and losses of residential mortgage loans held for sale, at fair value	$ 17,229	$ 10,515	$ 41,314	$ 28,590
Creation of new mortgage servicing rights, net of payoffs	6,562	3,837	12,621	11,910
Loan origination fee income on residential mortgage loans	3,320	2,474	7,688	7,312
Unrealized gains (loss) on IRLCs and other derivatives	1,902	185	2,998	478
Residential mortgage banking activities	29,013	17,011	64,621	48,290
Variable expenses on residential mortgage banking activities	$ (17,318)	$ (8,337)	$ (39,995)	$ (18,120)

The amount of correspondent fees and other direct loan expenses incurred during the period.

No definition available.

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- Definition

Represents the amount for creation of new mortgage servicing rights, net of payoffs, if any.

+ References

No definition available.

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- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21310-158488

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
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-URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21286-158488

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=117337389&loc=d3e21493-158490

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- Definition

Interest and fee income generated from consumer loans. Consumer loans are loans to individuals for household, family, and other personal expenditures. Such loans include residential mortgages, home equity lines-of-credit, automobiles and marine transport loans, credit card transactions, and others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

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- References

No definition available.

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- Definition

Interest and fee income generated from loans secured by one- to four-family residential properties. This item excludes home equity lines-of-credit.

+ References

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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
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