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Stockholders' Equity and Regulatory Requirements (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 and 2016, 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, 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% |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage (Tier 1) capital |  | $ | 434,067 |  |  |  | 10.34% |  |  | $ | 167,996 |  |  |  | 4.00% |  |  | $ | 209,995 |  |  |  | 5.00% |
Risk-Based Capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CET 1 |  | $ | 434,067 |  |  |  | 10.98% |  |  | $ | 177,944 |  |  |  | 4.50% |  |  | $ | 257,030 |  |  |  | 6.50% |
Tier 1 |  |  | 434,067 |  |  |  | 10.98% |  |  |  | 237,258 |  |  |  | 6.00% |  |  |  | 316,344 |  |  |  | 8.00% |
Total |  |  | 459,811 |  |  |  | 11.63% |  |  |  | 316,344 |  |  |  | 8.00% |  |  |  | 395,430 |  |  |  | 10.00% |
|  |  |  |  | Minimum Capital Adequacy |  |  | For Classification as Well Capitalized
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  | Ratio
The Company |  | (dollars in thousands) |
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
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage (Tier 1) capital |  | $ | 390,205 |  |  |  | 9.29% |  |  | $ | 168,048 |  |  |  | 4.00% |  |  | N/A |  | N/A
Risk-Based Capital: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CET 1 |  | $ | 385,050 |  |  |  | 9.74% |  |  | $ | 177,967 |  |  |  | 4.50% |  |  | N/A |  | N/A
Tier 1 |  |  | 390,205 |  |  |  | 9.87% |  |  |  | 237,289 |  |  |  | 6.00% |  |  | N/A |  | N/A
Total |  |  | 465,949 |  |  |  | 11.78% |  |  |  | 316,386 |  |  |  | 8.00% |  |  | N/A |  | N/A

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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