Income Taxes - Components Of The Provision For Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current Tax Expense (Benefit)
Federal									$ 4,752	$ 6,589	$ 3,227
State									1,200	1,558	835
Amortization of investment in low income housing tax credit partnerships									2,684	1,337	969
Total									8,636	9,484	5,031
Deferred Expense(Benefit)
Federal									127	(1,117)	1,034
State									21	(194)	181
Amortization of investment in low income housing tax credit partnerships									0	0	0
Total									148	(1,311)	1,215
Total Expense
Federal									4,879	5,472	4,261
State									1,221	1,364	1,016
Amortization of investment in low income housing tax credit partnerships									2,684	1,337	969
Total	$ 1,673	$ 2,678	$ 2,686	$ 1,747	$ 2,325	$ 1,982	$ 2,569	$ 1,297	$ 8,784	$ 8,173	$ 6,246