Investment Securities Other Investments (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Reported Value Measurement [Member]
Investment [Line Items]
FHLB stock	$ 27,235,000	$ 29,367,000
FRB stock	13,310,000	12,294,000
Other investment securities	42,409,000	42,708,000
Securities of a single issuer, other than US Treasury, government agencies and US government sponsored agencies exceeding 10% of Stockholders' Equity	0
Other investment securities	42,730,000	42,985,000
Trading Securities, Change in Unrealized Holding Gain (Loss)	44,000,000	619,000,000
Gain (Loss) on Sale of Equity Investments	787,000,000	413,000,000
Proceeds from Sale of Federal Home Loan Bank Stock	4,900,000
FIRST PRESTONSBURG BANCSHARES INC. [Member]
Investment [Line Items]
FRB stock	2,800,000
Equity investment securities (a)
Investment [Line Items]
Other investment securities	321,000	277,000
Nonqualified Plan [Member] \| Reported Value Measurement [Member]
Investment [Line Items]
Other investment securities	1,499,000	987,000
Other [Member] \| Reported Value Measurement [Member]
Investment [Line Items]
Other investment securities	$ 365,000	$ 60,000

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Securities of a single issuer, other than US Treasury, government agencies and US government sponsored agencies exceeding 10% of Stockholders' Equity

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No definition available.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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- 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
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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).

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The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

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Amount of investments classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Amount of cash inflow from sale of Federal Home Loan Bank (FHLB) stock.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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No definition available.

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