Commitments and Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Loan commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet instruments	$ 1,053,202	$ 1,095,054
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet instruments	$ 26,148	27,549
Standby letters of credit | Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	2 months
Standby letters of credit | Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	1 year
Commercial and similar letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance-sheet instruments	$ 3,207	$ 2,332
Commercial and similar letters of credit | Minimum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	2 months
Commercial and similar letters of credit | Maximum
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Letter of credit term	6 months