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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities, Estimated Fair Value $ 152,113   $ 155,701
Held-to-maturity securities, Amortized Cost 5,899   6,043
Held-to-maturity securities, Gross Unrealized Gains 10   14
Held-to-maturity securities, Gross Unrealized Losses 44   57
Held-to-maturity securities, Estimated Fair Value 5,865   6,000
Equity securities, at fair value 1,299   1,269
Accounting Standards Update 2016-01      
Schedule of Available-for-sale Securities [Line Items]      
Cumulative effect adjustment (ASU 2016-01) 1,300    
Fair value adjustment recorded through earnings 22 $ 19  
Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities, Amortized Cost 152,846   158,447
Available-for-sale securities, Gross Unrealized Gains 106   117
Available-for-sale securities, Gross Unrealized Losses 2,138   4,132
Available-for-sale securities, Estimated Fair Value 150,814   154,432
U.S. Government Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities, Amortized Cost 34,194   34,285
Available-for-sale securities, Gross Unrealized Gains 3   2
Available-for-sale securities, Gross Unrealized Losses 386   651
Available-for-sale securities, Estimated Fair Value 33,811   33,636
Held-to-maturity securities, Amortized Cost 1,498   1,642
Held-to-maturity securities, Gross Unrealized Losses 11   25
Held-to-maturity securities, Estimated Fair Value 1,487   1,617
States and Political Subdivisions [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Held-to-maturity securities, Amortized Cost 1,401   1,401
Held-to-maturity securities, Gross Unrealized Gains 10   14
Held-to-maturity securities, Estimated Fair Value 1,411   1,415
Mortgage-backed [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale securities, Amortized Cost 118,652   124,162
Available-for-sale securities, Gross Unrealized Gains 103   115
Available-for-sale securities, Gross Unrealized Losses 1,752   3,481
Available-for-sale securities, Estimated Fair Value 117,003   120,796
Other Debt Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Held-to-maturity securities, Amortized Cost 3,000   3,000
Held-to-maturity securities, Gross Unrealized Losses 33   32
Held-to-maturity securities, Estimated Fair Value $ 2,967   $ 2,968