Stockholders' Equity and Regulatory Requirements (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

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

The following is a summary of the Bank’s and the Parent Corporation’s actual capital amounts and ratios as of December 31, 2018 and 2017, compared to the FRB and FDIC minimum capital adequacy requirements and the FDIC requirements for classification as a well-capitalized institution.

					Minimum Capital Adequacy				For Classification Under Corrective Action Plan as Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
The Bank					(dollars in thousands)
December 31, 2018
Leverage (Tier 1) capital	$	552,311		10.78%	$	204,973		4.00%	$	256,217		5.00%
Risk-Based Capital:
CET 1	$	552,311		11.37%	$	218,589		4.50%	$	315,740		6.50%
Tier 1		552,311		11.37%		291,452		6.00%		388,603		8.00%
Total		619,515		12.75%		388,603		8.00%		485,754		10.00%
December 31, 2017
Leverage (Tier 1) capital	$	468,899		9.84%	$	190,665		4.00%	$	238,332		5.00%
Risk-Based Capital:
CET 1	$	468,899		10.21%	$	206,721		4.50%	$	298,597		6.50%
Tier 1		468,899		10.21%		275,628		6.00%		367,504		8.00%
Total		500,647		10.90%		367,504		8.00%		459,379		10.00%

					Minimum Capital Adequacy				For Classification as Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount	Ratio
The Company					(dollars in thousands)
December 31, 2018
Leverage (Tier 1) capital	$	478,876		9.34%	$	204,995		4.00%	N/A	N/A
Risk-Based Capital:
CET 1	$	473,721		9.75%	$	218,585		4.50%	N/A	N/A
Tier 1		478,876		9.86%		291,446		6.00%	N/A	N/A
Total		638,830		13.15%		388,595		8.00%	N/A	N/A
December 31, 2017
Leverage (Tier 1) capital	$	425,407		8.92%	$	190,728		4.00%	N/A	N/A
Risk-Based Capital:
CET 1	$	420,252		9.15%	$	206,742		4.50%	N/A	N/A
Tier 1		425,407		9.26%		275,656		6.00%	N/A	N/A
Total		507,155		11.04%		367,542		8.00%	N/A	N/A