Parent Company Only Financial Statements Condensed Parent Company Only Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
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, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]                              
Interest-bearing deposits with banks                         $ 274 $ 115 $ 79
Total interest income $ 9,464 $ 9,358 $ 9,221 $ 9,154 $ 9,606 $ 9,736 $ 9,695 $ 9,652 $ 9,768 $ 9,549 $ 9,684 $ 9,538 37,197 38,689 38,539
Total interest expense 1,772 1,694 1,653 1,632 1,609 1,517 1,517 1,598 1,694 1,804 1,879 2,149 6,751 6,241 7,526
Loss before provision for federal income taxes and equity in undistributed earnings of subsidiaries 3,643 3,430 3,551 3,423 4,584 4,197 3,664 4,098 4,276 2,477 2,554 1,615 14,047 16,543 10,922
Federal income tax provision (benefit) 1,526 984 1,183 1,194 1,644 1,462 1,297 1,453 342 (135) (13,809) 59 4,887 5,856 (13,543)
Net income $ 2,117 $ 2,446 $ 2,368 $ 2,229 $ 2,940 $ 2,735 $ 2,367 $ 2,645 $ 3,934 $ 2,612 $ 16,363 $ 1,556 9,160 10,687 24,465
Parent Company [Member]                              
Condensed Financial Statements, Captions [Line Items]                              
Interest-bearing deposits with banks                         143 26 27
Other Income                         2 8 12
Total interest income                         145 34 39
Total interest expense                         1,440 1,475 1,756
Loss before provision for federal income taxes and equity in undistributed earnings of subsidiaries                         (1,295) (1,441) (1,717)
Federal income tax provision (benefit)                         (601) (573) (619)
Loss before equity in undistributed loss of subsidiaries                         (694) (868) (1,098)
Equity in undistributed earnings of subsidiaries                         9,854 11,555 25,563
Net income                         $ 9,160 $ 10,687 $ 24,465