Borrowed Funds and Mandatorily Redeemable Securities (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Short-term borrowings:
Short-term borrowings	$ 291,943	$ 233,229
Short-term borrowings, weighted average interest rate	0.34%	0.33%
Federal funds purchased
Short-term borrowings:
Short-term borrowings	$ 0	$ 0
Short-term borrowings, weighted average interest rate	0.00%	0.00%
Security repurchase agreements
Short-term borrowings:
Short-term borrowings	$ 162,913	$ 130,662
Short-term borrowings, weighted average interest rate	0.17%	0.29%
Commercial paper
Short-term borrowings:
Short-term borrowings	$ 5,761	$ 7,295
Short-term borrowings, weighted average interest rate	0.27%	0.28%
Other short-term borrowings
Short-term borrowings:
Short-term borrowings	$ 123,269	$ 95,272
Short-term borrowings, weighted average interest rate	0.57%	0.38%