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v3.20.1

Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2020 |  | December 31, 2019 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ |  | (Dollars in thousands) | ​
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 676,267 |  | 9.51 | % | $ | 680,749 |  | 9.65 | %
Requirement to be well capitalized | ​ |  | 355,552 |  | 5.00 | ​ |  | 352,581 |  | 5.00 | ​
Excess | ​ |  | 320,715 |  | 4.51 | ​ |  | 328,168 |  | 4.65 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 676,267 |  | 12.48 | % | $ | 680,749 |  | 13.02 | %
Requirement to be well capitalized | ​ |  | 352,240 |  | 6.50 | ​ |  | 339,944 |  | 6.50 | ​
Excess | ​ |  | 324,027 |  | 5.98 | ​ |  | 340,805 |  | 6.52 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier 1 risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 676,267 |  | 12.48 | % | $ | 680,749 |  | 13.02 | %
Requirement to be well capitalized | ​ |  | 433,526 |  | 8.00 | ​ |  | 418,393 |  | 8.00 | ​
Excess | ​ |  | 242,741 |  | 4.48 | ​ |  | 262,356 |  | 5.02 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 703,130 |  | 12.98 | % | $ | 702,500 |  | 13.43 | %
Requirement to be well capitalized | ​ |  | 541,908 |  | 10.00 | ​ |  | 522,991 |  | 10.00 | ​
Excess | ​ |  | 161,222 |  | 2.98 | ​ |  | 179,509 |  | 3.43 | ​
Holding Company |
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2020 |  | December 31, 2019 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ | ​ | (Dollars in thousands) |
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 610,898 |  | 8.59 | % | $ | 615,500 |  | 8.73 | %
Requirement to be well capitalized | ​ |  | 355,470 |  | 5.00 | ​ |  | 352,581 |  | 5.00 | ​
Excess | ​ |  | 255,428 |  | 3.59 | ​ |  | 262,919 |  | 3.73 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 567,306 |  | 10.47 | % | $ | 572,651 |  | 10.95 | %
Requirement to be well capitalized | ​ |  | 352,184 |  | 6.50 | ​ |  | 339,929 |  | 6.50 | ​
Excess | ​ |  | 215,122 |  | 3.97 | ​ |  | 232,722 |  | 4.45 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier 1 risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 610,898 |  | 11.28 | % | $ | 615,500 |  | 11.77 | %
Requirement to be well capitalized | ​ |  | 433,458 |  | 8.00 | ​ |  | 418,374 |  | 8.00 | ​
Excess | ​ |  | 177,440 |  | 3.28 | ​ |  | 197,126 |  | 3.77 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 712,761 |  | 13.16 | % | $ | 712,251 |  | 13.62 | %
Requirement to be well capitalized | ​ |  | 541,822 |  | 10.00 | ​ |  | 522,967 |  | 10.00 | ​
Excess | ​ |  | 170,939 |  | 3.16 | ​ |  | 189,284 |  | 3.62 | ​

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