Investment Securities Other Investments (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Other Investments Carrying Value [Line Items]
Federal Home Loan Bank (FHLB) stock	$ 27,716,000				$ 27,716,000		$ 29,367,000
Federal Reserve Bank (FRB) stock	13,310,000				13,310,000		12,294,000
Other investment securities	42,727,000				42,727,000		42,708,000
Other investment securities	43,045,000				43,045,000		42,985,000
Proceeds from Sale of Federal Home Loan Bank Stock	1,500,000	$ 1,100,000	$ 1,800,000
Trading Securities, Change in Unrealized Holding Gain (Loss)	(19,000)			$ 16,000	(42,000)	$ (621,000)
Gain (Loss) on Sale of Equity Investments					787,000
Securities of a single issuer, other than US Treasury, government agencies and US government sponsored agencies exceeding 10% of Stockholders' Equity	0				0
Other
Other Investments Carrying Value [Line Items]
Other investment securities	365,000				365,000		60,000
Equity investment securities
Other Investments Carrying Value [Line Items]
Other investment securities	318,000				318,000		277,000
FIRST PRESTONSBURG BANCSHARES INC. [Member]
Other Investments Carrying Value [Line Items]
Federal Home Loan Bank (FHLB) stock	2,800,000				2,800,000
Nonqualified Plan [Member]
Other Investments Carrying Value [Line Items]
Other investment securities	$ 1,336,000				$ 1,336,000		$ 987,000