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Investment Securities - Gains and Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from Sale and Maturity of Marketable Securities	$ 4,725,000		$ 4,725,000
Proceeds from sales of securities		$ 0	3,835,000	$ 459,000
Gross realized gains	82,000	1,000	82,000	137,000
Gross realized losses	(67,000)	0	(67,000)	0
Net gain	15,000	1,000	15,000	137,000
Related income taxes	$ 3,000	$ 0	$ 3,000	$ 29,000

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Debt Securities, Realized Gain

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Debt Securities, Realized Loss

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Amount of unrealized and realized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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