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Investment Securities - Summary of Unrealized Loss Positions (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
security
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
security
Investments in an unrealized loss position      
Amount of pretax loss if securities in an unrealized loss position are sold $ 6,100,000    
Investments in an Unrealized Loss Position      
Less than 12 months, fair value 113,913,000   $ 88,519,000
Less than 12 months, unrealized loss (2,875,000)   (884,000)
12 months or more, fair value 65,085,000   61,917,000
12 months or more, unrealized loss (3,214,000)   $ (1,612,000)
Available-for-sale Securities      
Available-for-sale investments sold 680,000 $ 22,945,000  
Gains on the sale of available-for-sale investments 326,000 549,000  
Losses on the sale of available-for-sale investments 0 $ (366,000)  
Unrealized loss on securities $ (30,000)    
U. S. Agency securities      
Investments in an unrealized loss position      
Number of investments in an unrealized loss position | security 45   45
Investments in an Unrealized Loss Position      
Less than 12 months, fair value $ 62,984,000   $ 61,834,000
Less than 12 months, unrealized loss (1,471,000)   (659,000)
12 months or more, fair value 7,789,000   7,709,000
12 months or more, unrealized loss $ (343,000)   $ (182,000)
U.S. Sponsored Mortgage-backed securities      
Investments in an unrealized loss position      
Number of investments in an unrealized loss position | security 42   39
Investments in an Unrealized Loss Position      
Less than 12 months, fair value $ 19,632,000   $ 16,825,000
Less than 12 months, unrealized loss (541,000)   (159,000)
12 months or more, fair value 39,196,000   37,427,000
12 months or more, unrealized loss $ (1,968,000)   $ (1,105,000)
Municipal securities      
Investments in an unrealized loss position      
Number of investments in an unrealized loss position | security 86   47
Investments in an Unrealized Loss Position      
Less than 12 months, fair value $ 28,748,000   $ 8,826,000
Less than 12 months, unrealized loss (827,000)   (48,000)
12 months or more, fair value 18,100,000   16,781,000
12 months or more, unrealized loss $ (903,000)   $ (325,000)
Other securities      
Investments in an unrealized loss position      
Number of investments in an unrealized loss position | security 3    
Investments in an Unrealized Loss Position      
Less than 12 months, fair value $ 2,549,000    
Less than 12 months, unrealized loss (36,000)    
12 months or more, fair value 0    
12 months or more, unrealized loss $ 0    
Equity and other securities      
Investments in an unrealized loss position      
Number of investments in an unrealized loss position | security     2
Investments in an Unrealized Loss Position      
Less than 12 months, fair value     $ 1,034,000
Less than 12 months, unrealized loss     (18,000)
12 months or more, fair value     0
12 months or more, unrealized loss     $ 0