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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Beginning balance of allowance for off-balance sheet credit losses $ 8,640 $ 11,434  
Provision for off-balance sheet credit losses 971 (1,639)  
Ending balance of allowance for off-balance sheet credit losses 10,174 $ 9,795  
Commitments to extend credit      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet liability 7,301,491   $ 8,066,655
Standby letters of credit      
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Off-balance sheet liability $ 255,399   $ 261,405