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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Interest rate swap
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income
Cash pledged to secure obligations	$ 26,300		$ 26,300		$ 36,000
Interest rate swap | Not designated as hedging
Derivative Financial Instruments
Variable rate, commercial loans that are supported by the interest rate swap contracts	424,600		424,600		395,000
Notional Amount, Derivative Asset	424,567		424,567		394,954
Notional Amount, Derivative Liability	424,567		424,567		394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	21,330		21,330		32,685
Fair value recorded in other liabilities	21,330		21,330		32,685
Interest rate swaps - pay floating, receive fixed | Not designated as hedging
Derivative Financial Instruments
Notional Amount, Derivative Asset	332,856		332,856		394,954
Notional Amount, Derivative Liability	91,711		91,711
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	19,420		19,420		32,685
Fair value recorded in other liabilities	1,910		1,910
Interest rate swaps - pay fixed, receive floating | Not designated as hedging
Derivative Financial Instruments
Notional Amount, Derivative Asset	91,711		91,711
Notional Amount, Derivative Liability	332,856		332,856		394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	1,910		1,910
Fair value recorded in other liabilities	19,420		19,420		$ 32,685
Non-interest expense | Interest rate swap
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income
Gain (loss) pay, floating receive fixed	(2,024)	$ (549)	(11,355)	$ 25,790
Gain (loss) pay fixed receive floating	$ 2,024	$ 549	$ 11,355	$ (25,790)

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Nominal or face amount used to calculate payments on the derivative asset.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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