Parent Only Financial Information Parent Only Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Interest-Bearing Deposits at Banks	$ 16,252	$ 11,214
Available-for-sale Securities	402,309	366,139
Held-to-Maturity Securities	320,611	302,024
Other Assets	53,027	46,297
Total Assets	2,446,188	2,217,420
LIABILITIES
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000
Other Liabilities	21,621	23,125
Total Liabilities	2,232,217	2,016,494
Equity [Abstract]
Stockholders' Equity Attributable to Parent	213,971	200,926	$ 192,154	$ 175,825
Total Liabilities and Stockholders' Equity	2,446,188	2,217,420
Parent Company [Member]
ASSETS
Interest-Bearing Deposits at Banks	3,441	3,013
Available-for-sale Securities	1,232	1,254
Held-to-Maturity Securities	1,000	1,000
Equity Method Investments	225,934	214,813
Other Assets	7,390	6,538
Total Assets	238,997	226,618
LIABILITIES
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000
Other Liabilities	5,026	5,692
Total Liabilities	25,026	25,692
Equity [Abstract]
Stockholders' Equity Attributable to Parent	213,971	200,926
Total Liabilities and Stockholders' Equity	$ 238,997	$ 226,618