Investment Securities - FHLB, FRB, and other stock (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
FHLB stock	$ 17.3
Federal Reserve Bank Stock	51.7
Other stock	24.1
FHLB repurchases	$ 18.3	$ 24.9	$ 10.3

Represents the amount of excess FHLB stock repurchased by FHLB through the stock repurchase program.

No definition available.

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- Definition

Represents the amount of stock other than Federal Home Loan Bank stock and Federal Reserve Bank stock.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 325
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

+ Details

Name:	us-gaap_FederalReserveBankStock
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Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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Balance Type:	na
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