Income Taxes - Components Of The Provision For Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Tax Expense (Benefit)
Federal									$ 2,874	$ 4,752	$ 6,589
State									674	1,200	1,558
Amortization of investment in low income housing tax credit partnerships									2,868	2,684	1,337
Total									6,416	8,636	9,484
Deferred Expense(Benefit)
Federal									(281)	127	(1,117)
State									(83)	21	(194)
Amortization of investment in low income housing tax credit partnerships									0	0	0
Total									(364)	148	(1,311)
Total Expense
Federal									2,593	4,879	5,472
State									591	1,221	1,364
Amortization of investment in low income housing tax credit partnerships									2,868	2,684	1,337
Total	$ 1,458	$ 1,027	$ 1,868	$ 1,699	$ 1,673	$ 2,678	$ 2,686	$ 1,747	$ 6,052	$ 8,784	$ 8,173