TDR's and Other Pertinent Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of Troubled Debt Restructurings and other pertinent information
TDRs on accrual status	$ 27,093	$ 32,849
TDRs on nonaccrual status	5,199	5,225
Total TDRs	32,292	38,074
Amount of specific reserves included in the allowance for loan loss associated with TDRs:	1,417	1,628
Additional commitments to lend to a borrower who has been a party to a TDR:	$ 1,378	$ 972