Parent Only Financial Information Parent Only Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Interest-Bearing Deposits at Banks	$ 27,710	$ 30,276
Available-for-Sale	317,535	300,200
Equity securities	1,774	0
Other Assets	55,614	57,606
Total Assets	2,988,334	2,760,465
LIABILITIES
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000
Other Liabilities	19,507	20,780
Total Liabilities	2,718,750	2,510,862
Equity [Abstract]
Stockholders' Equity Attributable to Parent	269,584	249,603	$ 232,852	$ 213,971
Total Liabilities and Stockholders' Equity	2,988,334	2,760,465
Parent Company
ASSETS
Interest-Bearing Deposits at Banks	2,298	2,186
Available-for-Sale	0	1,562
Equity securities	1,774	0
Investment in Subsidiaries at Equity	280,408	261,622
Other Assets	8,626	7,987
Total Assets	293,106	273,357
LIABILITIES
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	20,000	20,000
Other Liabilities	3,522	3,754
Total Liabilities	23,522	23,754
Equity [Abstract]
Stockholders' Equity Attributable to Parent	269,584	249,603
Total Liabilities and Stockholders' Equity	$ 293,106	$ 273,357