Other Borrowings and Notes Payable (Tables)

12 Months Ended

Dec. 31, 2017

Debt Instrument [Line Items]

Schedule of Line of Credit Facilities [Table Text Block]

Revolving Credit

In February 2016, the Company entered into a senior unsecured revolving credit agreement ("Revolving Agreement") with another bank allowing for borrowings up to $20 million. The proceeds can be used for general corporate purposes.  The Revolving Agreement is subject to ongoing compliance with a number of customary affirmative and negative covenants as well as specified financial covenants. 

A summary of the amounts drawn on the Revolving Agreement as of December 31, 2017, and 2016 is as follows:

	December 31,
($ in thousands)	2017			2016
Outstanding balance	$	—		$	—
Average balance during the year	$	822		$	—
Maximum balance outstanding at any month-end	10,000			—
Weighted average interest rate during the year	3.50		%	—		%
Average interest rate at December 31	—		%	—		%

Other Borrowings

Debt Instrument [Line Items]

Summary of Other Borrowings

A summary of other borrowings is as follows:

	December 31,
($ in thousands)	2017			2016
Securities sold under customer repurchase agreements	$	253,674		$	276,980
Average balance during the year	$	220,807		$	206,643
Maximum balance outstanding at any month-end	253,674			276,980
Average interest rate during the year	0.21		%	0.19		%
Average interest rate at December 31	0.25		%	0.18		%