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Securities - Amortized Cost and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Amortized Cost $ 346,733 $ 334,008
Unrealized Gains 3,899 7,142
Unrealized Losses 4,130 801
Fair Value 346,502 340,349
Federal agencies and GSEs    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Amortized Cost 106,379 81,601
Unrealized Gains 62 170
Unrealized Losses 2,387 319
Fair Value 104,054 81,452
Mortgage-backed and CMOs    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Amortized Cost 79,917 70,520
Unrealized Gains 514 799
Unrealized Losses 938 389
Fair Value 79,493 70,930
State and municipal    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Amortized Cost 145,757 170,268
Unrealized Gains 2,540 5,659
Unrealized Losses 782 36
Fair Value 147,515 175,891
Corporate    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Amortized Cost 13,392 10,619
Unrealized Gains 123 28
Unrealized Losses 23 57
Fair Value 13,492 10,590
Equity securities    
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]    
Amortized Cost 1,288 1,000
Unrealized Gains 660 486
Unrealized Losses 0 0
Fair Value $ 1,948 $ 1,486