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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Not designated as hedging |  |  |
Derivative Financial Instruments |  |  |
Notional Amount, Derivative Asset | $ 394,954 | $ 290,418 |
Notional Amount, Derivative Liability | 394,954 | 290,418 |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |
Fair value recorded in other assets | 32,685 | 12,354 |
Fair value recorded in other liabilities | 32,685 | 12,354 |
Interest rate swap |  |  |
Derivative Financial Instruments |  |  |
Variable rate, commercial loans that are supported by the interest rate swap contracts | 395,000 | 290,400 |
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 | 36,000 | 18,100 |
Interest rate swap | Not designated as hedging |  |  |
Derivative Financial Instruments |  |  |
Notional Amount, Derivative Asset | 394,954 | 290,418 |
Notional Amount, Derivative Liability | 394,954 | 290,418 |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |
Fair value recorded in other assets | 32,685 | 12,354 |
Fair value recorded in other liabilities | 32,685 | 12,354 |
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 | 20,331 | 10,915 | $ 1,176
Gain (loss) pay fixed receive floating | $ 20,331 | $ 10,915 | $ 1,176

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