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Investment Securities (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
securities
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Available-for-sale: [Abstract]          
Amortized Cost $ 629,143,000   $ 629,143,000   $ 581,543,000
Gross Unrealized Gains 1,590,000   1,590,000   2,900,000
Gross Unrealized (Losses) (14,430,000)   (14,430,000)   (5,864,000)
Fair Value 616,303,000   616,303,000   578,579,000
Gain (Loss) on Sale of Securities, Net 881,000 $ 335,000 901,000 $ 335,000  
Held-to-maturity: [Abstract]          
Held-to-maturity Securities 69,383,000   69,383,000   69,332,000
Held-to-maturity Securities, Fair Value 67,525,000   67,525,000   68,457,000
Realized Investment Gains (Losses) [Abstract]          
Gross gains 921,000 352,000 941,000 352,000  
Gross losses (40,000) $ (17,000) (40,000) $ (17,000)  
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Amortized Cost 127,342,000   127,342,000   115,796,000
Gross Unrealized Gains 0   0   8,000
Gross Unrealized (Losses) (4,304,000)   (4,304,000)   (2,034,000)
Fair Value 123,038,000   123,038,000   113,770,000
Held-to-maturity: [Abstract]          
Held-to-maturity Securities 69,383,000   69,383,000   69,332,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 0   0   103,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (1,858,000)   (1,858,000)   (978,000)
Held-to-maturity Securities, Fair Value 67,525,000   67,525,000   68,457,000
Obligations of states and political subdivisions          
Available-for-sale: [Abstract]          
Amortized Cost 176,376,000   176,376,000   165,037,000
Gross Unrealized Gains 1,064,000   1,064,000   2,254,000
Gross Unrealized (Losses) (2,200,000)   (2,200,000)   (1,025,000)
Fair Value 175,240,000   175,240,000   166,266,000
Mortgage-backed securities: GSE residential          
Available-for-sale: [Abstract]          
Amortized Cost 323,238,000   323,238,000   295,778,000
Gross Unrealized Gains 359,000   359,000   493,000
Gross Unrealized (Losses) (7,926,000)   (7,926,000)   (2,460,000)
Fair Value 315,671,000   315,671,000   293,811,000
Trust preferred securities          
Available-for-sale: [Abstract]          
Amortized Cost 0   0   2,893,000
Gross Unrealized Gains 0   0   0
Gross Unrealized (Losses) 0   0   (345,000)
Fair Value 0   $ 0   2,548,000
Number of trust preferred securities | securities     1    
Gain (Loss) on Sale of Securities, Net 846,000        
Other securities          
Available-for-sale: [Abstract]          
Amortized Cost 2,187,000   $ 2,187,000   2,039,000
Gross Unrealized Gains 167,000   167,000   145,000
Gross Unrealized (Losses) 0   0   0
Fair Value $ 2,354,000   $ 2,354,000   $ 2,184,000