Fair Value of Assets & Liabilities - Gains/(losses) on Nonrecurring Fair Value Measurements (Details) - Non Recurring - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans, net of unearned income	$ (17,444)	$ (15,559)	$ (31,040)	$ (16,036)
Net gains/(losses), Real estate acquired by foreclosure	(34)	(282)	(203)	(256)
Net gains/(losses), Other assets	(346)	(407)	(1,118)	(1,349)
Gain (loss) on financial assets measured on non-recurring basis	(19,353)	(17,223)	(34,633)	(18,822)
First Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans held for sale	31	2	32	27
SBAs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans held for sale	$ (1,560)	$ (977)	$ (2,304)	$ (1,208)