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Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 26, 2016
Aug. 05, 2014
Total short-term borrowings $ 30,413 $ 401,561 $ 401,561    
Average daily balance short-term borrowings 236,464 138,653 138,653    
Maximum month-end balance short-term borrowings 397,141 410,614 410,614    
Total long-term borrowings 217,296 216,905      
Average daily balance long-term borrowings 220,000 220,000 220,000    
Maximum month-end balance long-term borrowings 220,000 220,000 220,000    
Subordinated Debt [Member]          
Total long-term borrowings 220,000 220,000 220,000    
Average daily balance long-term borrowings 220,000 220,000 220,000    
Maximum month-end balance long-term borrowings $ 220,000 $ 220,000 $ 220,000    
Debt instrument, interest rate, stated percentage 5.42% 5.42% 5.42% 5.00% 5.75%
Average interest rate 5.42% 5.42% 5.42%    
Month-end interest rate 5.42% 5.42% 5.42%    
Customer Repos and Federal Funds Purchased [Member]          
Total short-term borrowings $ 30,413 $ 76,561 $ 76,561    
Average daily balance short-term borrowings 44,333 73,237 73,237    
Maximum month-end balance short-term borrowings $ 72,141 $ 85,614 $ 85,614    
Debt instrument, interest rate, stated percentage 0.86% 0.33% 0.33%    
Average interest rate 0.51% 0.27% 0.27%    
Month-end interest rate 0.32% 0.29% 0.29%    
Federal Home Loan Bank [Member]          
Total short-term borrowings   $ 325,000 $ 325,000    
Average daily balance short-term borrowings $ 192,131 65,416 65,416    
Maximum month-end balance short-term borrowings $ 325,000 $ 325,000 $ 325,000    
Debt instrument, interest rate, stated percentage   1.48% 1.48%    
Average interest rate 2.02% 1.13% 1.13%    
Month-end interest rate 1.62% 1.48% 1.48%