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 | |