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Derivatives Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivatives and other information
Changes in fair value of loan swaps	$ 0
Unpaid principal on mortgage loans held for sale	5,511	$ 5,928
Collateral Pledged		0
Other assets
Derivatives and other information
Collateral Pledged	2,490
Forward sales of TBA securities | Not designated as hedges
Derivatives and other information
Notional amount	24,000
Derivative Liability	25
Interest rate swaps on loans | Designated as hedges
Derivatives and other information
Notional amount	25,000	25,000
Derivative Asset		289
Derivative Liability	145
Matched interest rate swap with borrower | Not designated as hedges
Derivatives and other information
Notional amount	74,266	45,961
Derivative Asset	2,454	216
Derivative Liability	8	1,391
Matched interest rate swaps with counterparty | Not designated as hedges
Derivatives and other information
Notional amount	74,266	45,961
Derivative Asset	8	1,391
Derivative Liability	2,454	216
IRLC | Not designated as hedges
Derivatives and other information
Notional amount	75,073	44,324
Derivative Asset	1,083	$ 636
Mortgage Banking Segment
Derivatives and other information
IRLCs	11,720
Unpaid principal on mortgage loans held for sale	21,980
Mortgage Banking Segment | Best-efforts forward sales contracts
Derivatives and other information
IRLCs	63,350
Unpaid principal on mortgage loans held for sale	65,770
Mortgage loans	129,120
Mortgage Banking Segment | Forward sales of TBA securities
Derivatives and other information
Mortgage loans	24,000
Mortgage Banking Segment | Mandatory-delivery forward sales contracts
Derivatives and other information
Mortgage loans	$ 6,730

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Fair value of securities pledged as collateral against derivative liabilities.

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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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