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Stockholders' Equity and Regulatory Requirements (Tables) | 12 Months Ended
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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

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