Regulatory Capital - (Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements) (Details) - USD ($) $ in Thousands	1 Months Ended
	Feb. 29, 2016	Dec. 31, 2016	Dec. 31, 2015
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio		10.40%	11.80%
Common equity risk-based ratio		14.20%	17.50%
Risk-based capital Ratio		14.20%	17.50%
Total risk-based capital Ratio		15.00%	18.40%
Leverage Amount		$ 470,259	$ 550,368
Common equity risk-based amount		470,259	550,368
Risk-based capital amount		470,259	550,368
Total risk-based capital Amount		$ 499,759	$ 578,448
Required to be considered adequately capitalized Ratio, leverage ratio		4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio		4.50%	4.50%
Required to be considered adequately capitalized Ratio, risk-based capital ratio		6.00%	6.00%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio		8.00%	8.00%
Required to be considered adequately capitalized leverage Amount		$ 181,019	$ 187,325
Required to be considered adequately capitalized common equity capital amount		203,647	210,741
Required to be considered adequately capitalized risk-based capital Amount		199,467	189,101
Required to be considered adequately capitalized Total risk-based capital Amount		$ 265,955	$ 252,134
NBH Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Permanent reduction in capital	$ 140,000
Cash distribution from reduction in capital	$ 140,000
Leverage Ratio		8.60%	11.20%
Common equity risk-based ratio		11.80%	16.60%
Risk-based capital Ratio		11.80%	16.60%
Total risk-based capital Ratio		12.70%	17.50%
Leverage Amount		$ 389,189	$ 519,766
Common equity risk-based amount		389,189	519,766
Risk-based capital amount		389,189	519,766
Total risk-based capital Amount		$ 418,689	$ 547,846
Required to be considered well capitalized Ratio, leverage ratio		4.50%	5.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio		6.50%	6.50%
Required to be considered well capitalized Ratio, risk-based capital ratio		8.00%	8.00%
Required to be considered well capitalized Ratio, Total risk-based capital ratio		10.00%	10.00%
Required to be considered well capitalized leverage Amount		$ 202,903	$ 464,078
Required to be considered well capitalized common equity capital amount		293,082	301,651
Required to be considered well capitalized risk-based capital Amount		264,596	344,989
Required to be considered well capitalized Total risk-based capital Amount		$ 330,745	$ 376,352
Required to be considered adequately capitalized Ratio, leverage ratio		4.00%	4.00%
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio		4.50%	4.50%
Required to be considered adequately capitalized Ratio, risk-based capital ratio		6.00%	6.00%
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio		8.00%	8.00%
Required to be considered adequately capitalized leverage Amount		$ 180,358	$ 185,631
Required to be considered adequately capitalized common equity capital amount		202,903	208,835
Required to be considered adequately capitalized risk-based capital Amount		198,447	188,176
Required to be considered adequately capitalized Total risk-based capital Amount		$ 264,596	$ 250,901