Derivatives (Financial Instruments Eligible for Offset) (Details) - Customer-initiated derivatives - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Offsetting derivative assets:
Gross amounts recognized	$ 14,422	$ 4,684
Gross amounts offset in the statements of financial condition	0	0
Net amounts presented in the statements of financial condition	14,422	4,684
Gross amounts not offset in the statements of financial position
Financial instruments	0	0
Collateral (received)/posted	0	0
Net amount	14,422	4,684
Offsetting derivative liabilities:
Gross amounts recognized	14,422	4,684
Gross amounts offset in the statements of financial condition	0	0
Net amounts presented in the statements of financial condition	14,422	4,684
Gross amounts not offset in the statements of financial position
Financial instruments	0	0
Collateral (received)/posted	15,383	4,375
Net amount	$ (961)	$ 309