Short-Term Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Summary of Federal Funds Purchased and Other Short-term Borrowings

Short-term borrowings, which consist of federal funds purchased and other short-term borrowings are summarized as follows:

	At December 31, 2017						At December 31, 2016
	Federal Funds Purchased			Short-term Borrowings			Federal Funds Purchased			Short-term Borrowings
Outstanding balance at year end	$	—		$	56,900		$	—		$	31,000
Maximum indebtedness during the year		20,000			115,050			20,000			70,400
Average balance during the year		119			38,825			116			10,483
Average rate paid during the year		1.68	%		1.12	%		0.86	%		0.42	%
Interest rate on year end balance		—			1.42	%		—			0.64	%

	At December 31, 2015
	Federal Funds Purchased			Short-term Borrowings
Outstanding balance at year end	$	—		$	53,700
Maximum indebtedness during the year		—			64,700
Average balance during the year		69			26,880
Average rate paid during the year		0.53	%		0.20	%
Interest rate on year end balance		—			0.35	%