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Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 26, 2016
Aug. 05, 2014
Total short-term borrowings $ 401,561 $ 68,876 $ 72,356    
Average daily balance short-term borrowings 138,653 107,209 86,800    
Maximum month-end balance short-term borrowings 410,614 236,689 213,696    
Total long-term borrowings 216,905 216,514 70,000    
Average daily balance long-term borrowings 220,000 135,164 82,446    
Maximum month-end balance long-term borrowings 220,000 220,000 119,300    
Subordinated Debt [Member]          
Total long-term borrowings 220,000 220,000 70,000    
Average daily balance long-term borrowings 220,000 135,164 74,117    
Maximum month-end balance long-term borrowings $ 220,000 $ 220,000 $ 79,300    
Debt instrument, interest rate, stated percentage 5.42% 5.42% 5.75% 5.00% 5.75%
Average interest rate 5.42% 5.42% 6.06%    
Month-end interest rate 5.42% 5.42% 6.52%    
Federal Home Loan Bank LTD [Member]          
Total long-term borrowings $ 0 $ 0 $ 0    
Average daily balance long-term borrowings 0 0 8,329    
Maximum month-end balance long-term borrowings 0 0 $ 40,000    
Average interest rate     2.25%    
Month-end interest rate     0.37%    
Customer Repos and Federal Funds Purchased [Member]          
Total short-term borrowings 76,561 68,876 $ 72,356    
Average daily balance short-term borrowings 73,237 77,833 59,141    
Maximum month-end balance short-term borrowings $ 85,614 $ 136,689 $ 73,696    
Debt instrument, interest rate, stated percentage 0.33% 0.35% 0.23%    
Average interest rate 0.27% 0.21% 0.22%    
Month-end interest rate 0.29% 0.16% 0.21%    
Federal Home Loan Bank [Member]          
Total short-term borrowings $ 325,000        
Average daily balance short-term borrowings 65,416 $ 29,376 $ 27,659    
Maximum month-end balance short-term borrowings $ 325,000 $ 100,000 $ 140,000    
Debt instrument, interest rate, stated percentage 1.48%        
Average interest rate 1.13% 2.45% 0.31%    
Month-end interest rate 1.48% 0.94% 0.20%