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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans, net of unearned income	$ (15,559)	$ 363	$ (16,036)	$ 1,020
Net gains/(losses), Real estate acquired by foreclosure	(282)	(776)	(256)	(2,198)
Net gains/(losses), Other assets	(407)	(1,370)	(1,349)	(3,586)
Gain (loss) on financial assets measured on non-recurring basis	(17,223)	(2,993)	(18,822)	(7,221)
First Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans held for sale	2	3	27	7
SBAs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains/(losses), Loans held for sale	$ (977)	$ (1,213)	$ (1,208)	$ (2,464)