Regulatory Capital - (Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements) (Details) - USD ($) $ in Thousands	1 Months Ended
	Feb. 29, 2016	Jun. 30, 2016	Dec. 31, 2015
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio		11.00%	11.80%
Common equity risk-based ratio		16.20%	17.50%
Risk-based capital Ratio		16.20%	17.50%
Total risk-based capital Ratio		17.50%	18.40%
Leverage Amount		$ 520,384	$ 550,368
Common equity risk-based amount		520,384	550,368
Risk-based capital amount		520,384	550,368
Total risk-based capital Amount		$ 560,302	$ 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		$ 188,492	$ 187,325
Required to be considered adequately capitalized common equity capital amount		212,053	210,741
Required to be considered adequately capitalized risk-based capital Amount		192,336	189,101
Required to be considered adequately capitalized Total risk-based capital Amount		$ 256,448	$ 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		8.30%	11.20%
Common equity risk-based ratio		12.10%	16.60%
Risk-based capital Ratio		12.10%	16.60%
Total risk-based capital Ratio		13.40%	17.50%
Leverage Amount		$ 387,176	$ 519,766
Common equity risk-based amount		387,176	519,766
Risk-based capital amount		387,176	519,766
Total risk-based capital Amount		$ 427,095	$ 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		$ 209,989	$ 464,078
Required to be considered well capitalized common equity capital amount		303,318	301,651
Required to be considered well capitalized risk-based capital Amount		255,409	344,989
Required to be considered well capitalized Total risk-based capital Amount		$ 319,216	$ 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		$ 186,657	$ 185,631
Required to be considered adequately capitalized common equity capital amount		209,989	208,835
Required to be considered adequately capitalized risk-based capital Amount		191,556	188,176
Required to be considered adequately capitalized Total risk-based capital Amount		$ 255,409	$ 250,901