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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2020
Accounting Policies [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The following table illustrates the impact of adoption:
($ in thousands) | December 31, 2019 |  | Impact of Adoption |  | January 1, 2020 |
Assets: |  |  |  |  |
Loans | $ | 5,314,337 |  |  | $ | 7,091 |  |  | $ | 5,321,428 |
Allowance for credit losses on loans | 43,288 |  |  | 28,387 |  |  | 71,675 |
Allowance for credit losses on held-to-maturity debt securities | — |  |  | 303 |  |  | 303 |
Deferred tax asset | 14,851 |  |  | 5,898 |  |  | 20,749 |
Liabilities: |  |  |  |  |
Reserve for unfunded commitments | 430 |  |  | 2,413 |  |  | 2,843 |
Shareholders’ Equity |  |  |  |  |
Retained Earnings | 380,737 |  |  | (18,114 | ) |  | 362,623 |

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