Other Assets (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other Assets [Abstract]
Cash surrender value of bank-owned life insurance	$ 338,002	$ 286,109
Separate account life insurance	31,800	31,500
Investments, fair value	30,600
Federal Home Loan Bank stock held	67,100	76,900
Federal Reserve Bank stock held	$ 1,200	$ 1,200