9. Short-Term Borrowings

In addition to the liquidity provided by balance sheet cash flows, liquidity must also be supplemented with additional sources such as credit lines from correspondent banks as well as borrowings from the FHLB and the Federal Reserve Bank. Other funding alternatives may also be appropriate from time to time, including wholesale and retail repurchase agreements and brokered certificate of deposit (“CD”) accounts.

Short-term borrowings totaled $871.7 million and $719.1 million at December 31, 2018 and 2017, respectively, and consist of Federal funds purchased and securities sold under repurchase agreements, which generally represent overnight borrowing transactions and other short-term borrowings, primarily FHLB advances, with original maturities of one year or less.

The Company has unused lines of credit with the FHLB and access to brokered deposits available for short-term financing of approximately $1.9 billion and $2.0 billion at December 31, 2018 and 2017, respectively. Borrowings on the FHLB lines are secured by FHLB stock, certain securities and one-to-four family first lien mortgage loans. Securities collateralizing repurchase agreements are held in safekeeping by nonaffiliated financial institutions and are under the Company’s control.

Information related to short-term borrowings is summarized as follows as of December 31:

(Dollars in thousands)	2018			2017			2016
Federal funds purchased:
Balance at year-end	$	80,000		$	60,000		$	50,000
Average during the year		66,839			54,162			65,257
Maximum month end balance		80,000			80,000			85,000
Weighted average rate during the year		3.43	%		2.16	%		0.98	%
Weighted average rate at year-end		4.25	%		2.41	%		1.19	%

Securities sold under repurchase agreements:
Balance at year-end	$	160,696		$	182,123		$	173,703
Average during the year		146,135			175,539			168,821
Maximum month end balance		170,350			190,326			189,875
Weighted average rate during the year		0.16	%		0.07	%		0.06	%
Weighted average rate at year-end		0.38	%		0.07	%		0.07	%

Other short-term borrowings:
Balance at year-end	$	631,000		$	477,000		$	458,000
Average during the year		514,662			460,334			263,575
Maximum month end balance		653,000			591,000			424,000
Weighted average rate during the year		1.56	%		1.02	%		0.59	%
Weighted average rate at year-end		1.82	%		1.18	%		0.70	%

See Note 3 for additional information regarding securities pledged as collateral for securities sold under the repurchase agreements.