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Other Borrowings and Notes Payable (Tables)
 12 Months Ended
Dec. 31, 2016
Other Borrowings  
Debt Instrument [Line Items]  
Summary of Other Borrowings
A summary of other borrowings is as follows:
 
December 31,
($ in thousands)
2016
 
2015
Securities sold under repurchase agreements
$
276,980

 
$
270,326

 
 
 
 
Average balance during the year
$
206,643

 
$
195,328

Maximum balance outstanding at any month-end
276,980

 
270,326

Average interest rate during the year
0.19
%
 
0.22
%
Average interest rate at December 31
0.18
%
 
0.16
%
Unsecured Term Loan  
Debt Instrument [Line Items]  
Summary of Other Borrowings
A summary of the Term Loan is as follows:
($ in thousands)
December 31, 2015
Term Loan
$
—

 
 
Average balance during the year
$
4,509

Maximum balance outstanding at any month-end
5,700

Weighted average interest rate during the year
3.01
%
Average interest rate at December 31
—
%