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Investment Securities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
securities
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Available-for-sale: [Abstract]      
Amortized Cost $ 581,543 $ 628,895  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2,900 2,037  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (5,864) (11,084)  
Fair Value 578,579 619,848  
Held-to-maturity Securities [Abstract]      
Held-to-maturity Securities 69,332 74,231  
Held-to-maturity Securities, Fair Value 68,457 73,096  
Realized Investment Gains (Losses) [Abstract]      
Proceeds from sales 159,663 70,757 $ 19,380
Gross gains 773 1,192 452
Gross losses (157) 0 0
Income tax expense 216 465 $ 176
U.S. Treasury securities and obligations of U.S. government corporations & agencies      
Available-for-sale: [Abstract]      
Amortized Cost 115,796 138,819  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 8 13  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2,034) (2,508)  
Fair Value 113,770 136,324  
Held-to-maturity Securities [Abstract]      
Held-to-maturity Securities 69,332 74,231  
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 103 203  
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (978) (1,338)  
Held-to-maturity Securities, Fair Value 68,457 73,096  
Obligations of states and political subdivisions      
Available-for-sale: [Abstract]      
Amortized Cost 165,037 164,163  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2,254 1,346  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1,025) (2,804)  
Fair Value 166,266 162,705  
Mortgage-backed securities: GSE residential      
Available-for-sale: [Abstract]      
Amortized Cost 295,778 318,829  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 493 531  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2,460) (4,369)  
Fair Value 293,811 314,991  
Trust preferred securities      
Available-for-sale: [Abstract]      
Amortized Cost 2,893 3,050  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (345) (1,398)  
Fair Value $ 2,548 1,652  
Held-to-maturity Securities [Abstract]      
Number of trust preferred securities | securities 1    
Maturities of Debt Securities twenty    
Other securities      
Available-for-sale: [Abstract]      
Amortized Cost $ 2,039 4,034  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 145 147  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 (5)  
Fair Value $ 2,184 $ 4,176