Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2015

REGULATORY MATTERS [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

	Actual				For capital adequacy purposes (at least)				To be well capitalized under prompt corrective action provisions (at least)
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(In thousands)
As of December 31, 2015
Common equity tier 1 risk-based capital
Company	$	534,241	9.80	%	$	245,216	4.5	%	n/a		n/a
Boston Private Bank	621,668		11.49		243,407		4.5		$	351,588	6.5	%
Tier 1 risk-based capital
Company	686,160		12.59		326,954		6.0		n/a		n/a
Boston Private Bank	621,668		11.49		324,543		6.0		432,723		8.0
Total risk-based capital
Company	754,758		13.85		435,939		8.0		n/a		n/a
Boston Private Bank	689,437		12.75		432,723		8.0		540,904		10.0
Tier 1 leverage capital
Company	686,160		9.50		289,059		4.0		n/a		n/a
Boston Private Bank	621,668		8.68		286,461		4.0		358,077		5.0
As of December 31, 2014
Tier 1 risk-based capital
Company	$	637,968	12.57	%	$	202,959	4.0	%	n/a		n/a
Boston Private Bank	566,444		11.25		201,480		4.0		$	302,220	6.0	%
Total risk-based capital
Company	701,705		13.83		405,918		8.0		n/a		n/a
Boston Private Bank	629,591		12.50		402,960		8.0		503,700		10.0
Tier 1 leverage capital
Company	637,968		9.53		267,651		4.0		n/a		n/a
Boston Private Bank	566,444		8.55		265,077		4.0		331,346		5.0

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n/a = not applicable