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Borrowings (Schedule of Advances to the Federal Home Loan Bank) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fixed Rate:    
FHLB advances, carrying value of residential real estate and commercial loans pledged as collateral $ 1,060,000  
FHLB advances, securities pledged as collateral $ 400 $ 544
Minimum [Member]    
Fixed Rate:    
2017 0.73%  
2020 1.87%  
Maximum [Member]    
Fixed Rate:    
2017 0.84%  
Long-term Debt [Member]    
Fixed Rate:    
Capital Lease Obligations, Noncurrent $ 791 859
Long-term Federal Home Loan Bank Advances 10,000 30,000
Short-term Debt [Member]    
Total Outstanding:    
2017 210,000 $ 255,000
Short Term Borrowing Maturing January 2017 [Member] | Short-term Debt [Member]    
Total Outstanding:    
2017 $ 190,000  
Federal Home Loan Bank, Advances, Callable Option [Member] | Minimum [Member]    
Fixed Rate:    
2017 3.99%  
Federal Home Loan Bank, Advances, Callable Option [Member] | Maximum [Member]    
Fixed Rate:    
2017 4.06%  
Federal Home Loan Bank, Advances, Callable Option [Member] | Short-term Debt [Member]    
Total Outstanding:    
2017 $ 20,000