Borrowings - Notes payable -Parenthetical (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Advances with FHLB with maturities ranging from 2020 Through 2029
Debt Instrument
Notes Payable Maturity Year Range Start	2020
Notes Payable Maturity Year Range End	2029
Debt Instrument Frequency Of Periodic Payment	monthly
Advances with FHLB with maturities ranging from 2020 Through 2029 \| Minimum
Debt Instrument
Advances with the FHLB, interest rate	1.14%	0.95%
Advances with FHLB with maturities ranging from 2020 Through 2029 \| Maximum
Debt Instrument
Advances with the FHLB, interest rate	4.19%	4.19%
Advances with the FHLB paying interest monthly at a floating rate
Debt Instrument
Advances with the FHLB, maturity		2019
Debt Instrument Frequency Of Periodic Payment		monthly
Advances with the FHLB paying interest monthly at a floating rate \| LIBOR
Debt Instrument
Variable rate		0.34%
Floating rate over the 3 month LIBOR with maturities on 2019
Debt Instrument
Advances with the FHLB, maturity		2019
Debt Instrument Frequency Of Periodic Payment		quarterly
Floating rate over the 3 month LIBOR with maturities on 2019 \| Minimum \| LIBOR
Debt Instrument
Variable rate		0.12%
Floating rate over the 3 month LIBOR with maturities on 2019 \| Maximum \| LIBOR
Debt Instrument
Variable rate		0.24%
Fixed Rate with maturities on 2023 paying interest semiannually \| Unsecured senior debt
Debt Instrument
Fixed interest rate percentage	6.125%
Senior Debt Maturity Year	2023
Debt issuance costs	$ 4,693	$ 5,961
Debt Instrument Frequency Of Periodic Payment	semiannually
Fixed Rate with maturities ranging from 2033 to 2034 \| Junior subordinated debt
Debt Instrument
Notes Payable Maturity Year Range Start	2033
Notes Payable Maturity Year Range End	2034
Debt issuance costs	$ 396	$ 423
Fixed Rate with maturities ranging from 2033 to 2034 \| Minimum \| Junior subordinated debt
Debt Instrument
Fixed interest rate percentage	6.125%
Fixed Rate with maturities ranging from 2033 to 2034 \| Maximum \| Junior subordinated debt
Debt Instrument
Fixed interest rate percentage	6.70%

Latest year the outstanding debt instruments are required to be repaid.

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Earliest year the outstanding debt instruments are required to be repaid.

+ References

No definition available.

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Maturity year the outstanding debt instruments are required to be repaid.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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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.

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No definition available.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
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- Definition

The year of maturity, when only one maturity date applies, for the advances from the Federal Home Loan Bank as of the Balance Sheet date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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-Section 45
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- Definition

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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