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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	$ 28,300		$ 28,300		$ 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	408,500		408,500		395,000
Notional Amount, Derivative Asset	408,477		408,477		394,954
Notional Amount, Derivative Liability	408,477		408,477		394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	23,354		23,354		32,685
Fair value recorded in other liabilities	23,354		23,354		32,685
Interest rate swaps - pay floating, receive fixed | Not designated as hedging
Derivative Financial Instruments
Notional Amount, Derivative Asset	326,513		326,513		394,954
Notional Amount, Derivative Liability	81,964		81,964
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	21,981		21,981		32,685
Fair value recorded in other liabilities	1,373		1,373
Interest rate swaps - pay fixed, receive floating | Not designated as hedging
Derivative Financial Instruments
Notional Amount, Derivative Asset	81,964		81,964
Notional Amount, Derivative Liability	326,513		326,513		394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	1,373		1,373
Fair value recorded in other liabilities	21,981		21,981		$ 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	1,264	$ 2,861	(9,331)	$ 26,339
Gain (loss) pay fixed receive floating	$ (1,264)	$ (2,861)	$ 9,331	$ (26,339)

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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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