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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - Interest rate swap - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income
Net gains (losses)	$ 0	$ 0	$ 0	$ 0
Cash pledged to secure obligations	40,100		40,100		$ 18,100
Not designated as hedging
Derivative Financial Instruments
Notional amount	791,100		791,100		580,800
Variable rate, commercial loans that are supported by the interest rate swap contracts	395,500		395,500		290,400
Non-interest income
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	(549)	4,695	25,790	15,205
Non-interest expense
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income
Gain (loss) pay fixed receive floating	549	$ (4,695)	(25,790)	$ (15,205)
Other assets
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other assets	38,144		38,144		12,354
Other liabilities
Fair values of derivative assets and liabilities recorded in consolidated balance sheets
Fair value recorded in other liabilities	$ 38,144		$ 38,144		$ 12,354

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