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Securities, Gains (Loss) on Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2008
Gains (Loss) on Sales of Securities [Abstract}
Net securities gain (loss)	$ 14	$ (2)	$ 574	$ (288)
Net gain (loss) realized on sales and calls of AFS securities	(2)		4	(288)
Realized pre-tax gain on sales and calls of AFS securities	1		81	284
Realized pre-tax loss on sales and calls of AFS securities	3	$ 2	77	$ 572
Unrealized gain from equity securities	16		570
Equity securities at fair value	1,743		1,743		$ 1,173
Securities pledged as collateral to secure public deposit and for other purposes	237,900		237,900		258,800
Amortized cost of securities sold under agreements to repurchase	259,100		259,100		289,100
Class B Restricted Stock [Member]
Gains (Loss) on Sales of Securities [Abstract}
Number of shares of stock acquired (in shares)						9,918
Gain on recognition of fair value of equity securities					$ 1,200
Number of shares held in portfolio (in shares)					9,918
Equity securities at fair value	$ 1,700		$ 1,700

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Number of shares held in portfolio by the entity.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

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Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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