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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net of unearned income	$ 363	$ (2,388)	$ 1,020	$ (1,456)
OREO	(776)	(41)	(2,198)	(662)
Other assets	(1,370)	(762)	(3,586)	(2,646)
Total	(2,993)	(3,271)	(7,221)	(6,001)
Loans held-for-sale—first mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	3	6	7	22
Loans held-for-sale—SBAs and USDA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	$ (1,213)	$ (86)	$ (2,464)	$ (1,259)