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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of short-term and long-term borrowings

Information relating to short-term and long-term borrowings is as follows for the years ended December 31:

 

    2017   2016   2015  
(dollars in thousands)   Amount   Rate   Amount   Rate   Amount   Rate  
Short-term:                          
At Year-End:                          
Customer repurchase agreements and federal funds purchased   $ 76,561   0.33 % $ 68,876   0.35 % $ 72,356   0.23 %
Federal Home Loan Bank — current portion   325,000   1.48 % —       —   —  
Total   $ 401,561       $ 68,876       $ 72,356      
                           
Average Daily Balance:                          
Customer repurchase agreements and federal funds purchased   $ 73,237   0.27 % $ 77,833   0.21 % $ 59,141   0.22 %
Federal Home Loan Bank — current portion   65,416   1.13 % 29,376   2.45 % 27,659   0.31 %
Total   $ 138,653       $ 107,209       $ 86,800      
                           
Maximum Month-end Balance:                          
Customer repurchase agreements and federal funds purchased   $ 85,614   0.29 % $ 136,689   0.16 % $ 73,696   0.21 %
Federal Home Loan Bank — current portion   325,000   1.48 % 100,000   0.94 % 140,000   0.20 %
Total   $ 410,614       $ 236,689       $ 213,696      
                           
Long-term:                          
At Year-End:                          
Federal Home Loan Bank   $ 0   —   $ 0   —   $ 0   —  
Subordinated Notes   220,000   5.42 % 220,000   5.42 % 70,000   5.75 %
Total   $ 220,000       $ 220,000       $ 70,000      
                           
Average Daily Balance:                          
Federal Home Loan Bank   $ 0   —   $ 0   —   $ 8,329   2.25 %
Subordinated Notes   220,000   5.54 % 135,164   5.54 % 74,117   6.06 %
Total   $ 220,000       $ 135,164       $ 82,446      
                           
Maximum Month-end Balance:                          
Federal Home Loan Bank   $ 0   —   $ 0   —   $ 40,000   0.37 %
Subordinated Notes   220,000   5.42 % 220,000   5.42 % 79,300   6.52 %
Total   $ 220,000       $ 220,000       $ 119,300