Investment Securities Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities
Amortized cost basis	$ 361,954	$ 421,740
Gross unrealized gains	9,594	7,751
Gross unrealized losses	693	2,250
Estimated fair value	370,855	427,241
US Treasury securities
Schedule of Available-for-sale Securities
Amortized cost basis		6,931
Gross unrealized gains		0
Gross unrealized losses		21
Estimated fair value		6,910
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities
Amortized cost basis	6,027	26,600
Gross unrealized gains	96	99
Gross unrealized losses	0	46
Estimated fair value	6,123	26,653
State and political subdivisions
Schedule of Available-for-sale Securities
Amortized cost basis	162,480	176,794
Gross unrealized gains	7,487	6,662
Gross unrealized losses	3	72
Estimated fair value	169,964	183,384
Mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost basis	44,766	56,950
Gross unrealized gains	767	569
Gross unrealized losses	4	457
Estimated fair value	45,529	57,062
Collateralized mortgage obligations
Schedule of Available-for-sale Securities
Amortized cost basis	104,401	107,613
Gross unrealized gains	782	321
Gross unrealized losses	652	1,530
Estimated fair value	104,531	106,404
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized cost basis	43,025	45,602
Gross unrealized gains	422	50
Gross unrealized losses	16	86
Estimated fair value	43,431	45,566
Debt securities
Schedule of Available-for-sale Securities
Amortized cost basis	360,699	420,490
Gross unrealized gains	9,554	7,701
Gross unrealized losses	675	2,212
Estimated fair value	369,578	425,979
Equity securities
Schedule of Available-for-sale Securities
Amortized cost basis	1,255	1,250
Gross unrealized gains	40	50
Gross unrealized losses	18	38
Estimated fair value	$ 1,277	$ 1,262