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Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value $ 44,687 $ 47,594
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 1,487 754
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 89,822 82,737
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 5,386 6,695
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 63,559 27,302
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 1,069 149
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 18,416 14,540
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 973 357
US government agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 4,838 4,931
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 162 69
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 23,913 24,325
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 1,087 675
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 15,934  
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 12  
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0  
Residential mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 29,047 15,897
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 696 135
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 14,645 10,422
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 755 288
Commercial mortgage-backed agencies [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 12,311 12,593
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 473 169
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 26,532 28,298
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 1,134 711
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 16,416 9,028
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 227 6
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 0 0
Collateralized mortgage obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 16,826 27,387
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 619 472
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 20,799 12,447
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 859 443
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 0 0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 0 0
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 3,771 4,118
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 218 69
Obligations of states and political subdivisions [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 10,712 2,683
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 233 44
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 2,431 2,747
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses 96 75
Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value 2,162 2,377
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss 134 8
Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value 0 0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss 0 0
Collateralized debt obligations [Member]    
Schedule of Investments [Line Items]    
Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value 0 0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses 0 0
Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value 16,147 14,920
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses $ 2,210 $ 4,791