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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Beginning balance of allowance for off-balance sheet credit losses $ 16,492 $ 17,147 $ 17,265 $ 17,434  
Provision for off-balance sheet credit losses 1,489 (400) 716 (687)  
Ending balance of allowance for off-balance sheet credit losses 17,981 $ 16,747 17,981 $ 16,747  
Commitments to extend credit          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Off-balance sheet liability 10,194,949   10,194,949   $ 9,445,763
Standby letters of credit          
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]          
Off-balance sheet liability $ 378,217   $ 378,217   $ 357,672