Quarterly Results Of Operations (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Results of Operations [Abstract]                      
Interest income $ 12,953 $ 12,670 $ 12,364 $ 12,413 $ 12,319 $ 11,819 $ 11,473 $ 11,361 $ 50,400 $ 46,972 $ 46,512
Interest expense 1,949 2,024 2,075 1,992 2,114 2,124 2,172 2,209 8,040 8,619 10,527
Net interest income 11,004 10,646 10,289 10,421 10,205 9,695 9,301 9,152 42,360 38,353 35,985
Provision for loan losses 500 250 300 550 500 150 560 260 1,600 1,470 1,750
Noninterest income 1,825 1,892 1,816 1,650 1,671 1,621 1,672 1,688 8,153 7,754 8,190
Gain on sales of loans held for sale 146 124 102 80 145 233 322 319 452 1,019 1,327
Noninterest expense 8,840 8,002 7,986 7,648 8,012 7,732 7,157 7,253 32,476 30,154 29,928
Income before taxes and securities gain (loss) 3,635 4,410 3,921 3,953 3,509 3,667 3,578 3,646      
Gains (loss) on sales of securities available-for-sale 372 146 0 0 39 0 44 0 518 83 427
Income before income taxes 4,007 4,556 3,921 3,953 3,548 3,667 3,622 3,646 16,437 14,483 12,497
Provision for income taxes 1,227 1,377 1,114 950 966 990 977 984 4,668 3,917 3,103
Net income 2,780 3,179 2,807 3,003 2,582 2,677 2,645 2,662 11,769 10,566 9,394
Preferred stock dividends 30 30 52 62 63 62 62 63 174 250 384
Net income available to common shareholders $ 2,750 $ 3,149 $ 2,755 $ 2,941 $ 2,519 $ 2,615 $ 2,583 $ 2,599 $ 11,595 $ 10,316 $ 9,010
Net income per common share, basic $ 0.47 [1] $ 0.54 [1] $ 0.48 [1] $ 0.58 [1] $ 0.50 [1] $ 0.52 [1] $ 0.52 [1] $ 0.53 [1] $ 2.07 $ 2.07 $ 1.84
Net income per common share, diluted $ 0.46 [1] $ 0.54 [1] $ 0.47 [1] $ 0.56 [1] $ 0.49 [1] $ 0.51 [1] $ 0.51 [1] $ 0.52 [1] $ 2.03 $ 2.03 $ 1.82
[1] adjusted for common stock dividends distributed.