| **Supplemental Cash Flow Disclosures**            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Supplemental Cash Flow Information [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Supplemental Cash Flow Disclosures                | Supplemental Cash Flow DisclosuresThe following table presents information related to cash paid during the period for interest, as well as detail on non-cash investing and financing activities for the nine months endedSeptember 30: 2016 2015 (dollars in thousands)Cash paid during the period for:   Interest$14,768 $11,682Income taxes15,750 4,000Non-cash investing and financing activities:   Loans transferred to other real estate owned and repossessed assets3,973 7,413Loans transferred from held to maturity to held for sale3,573 3,071Gross increase in market value adjustment to securities available for sale13,094 12,381Gross increase in market value adjustment to derivatives981 2,167Investments committed to purchase, not settled276 1,350Proceeds from death benefit on bank-owned life insurance not received320 — |

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| - Definition
The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586
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| - References
No definition available.
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