Income Taxes - Components Of The Provision For Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Tax Expense (Benefit)
Federal									$ 1,078	$ (1,549)	$ 2,618
State									977	(85)	1,423
Amortization of investment in low income housing tax credit partnerships									2,668	2,691	2,276
Total									4,723	1,057	6,317
Deferred Expense (Benefit)
Federal									476	2,017	3,658
State									235	997	346
Amortization of investment in low income housing tax credit partnerships									0	0	0
Total									711	3,014	4,004
Total Expense
Federal									1,554	468	6,276
State									1,212	912	1,769
Amortization of investment in low income housing tax credit partnerships									2,668	2,691	2,276
Total	$ 1,100	$ 2,028	$ 1,146	$ 1,160	$ 907	$ 1,129	$ 1,167	$ 868	$ 5,434	$ 4,071	$ 10,321