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Acquisition - Summary (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 03, 2017 | Dec. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ (3,188) | $ (479,469) | $ 3,533
Fair Value of Liabilities Assumed |  |  |  |  |
Goodwill |  |  | 255,353 | $ 186,500 |
Goodwill, Acquired During Period |  |  | $ 68,900 |  |
FirstMerit Bank, NA, Branch Acquisition [Member] |  |  |  |  |
Consideration Received |  |  |  |  |
Cash received |  | $ (476,555) |  |  |
Total consideration received |  | (476,555) |  |  |
Fair Value of Assets Acquired |  |  |  |  |
Cash and cash equivalents |  | 2,914 |  |  |
Loans |  | 102,097 |  |  |
Premises and other equipment |  | 6,072 |  |  |
Core deposit intangible |  | 11,330 |  |  |
Other assets |  | 353 |  |  |
Total assets acquired |  | 122,766 |  |  |
Fair Value of Liabilities Assumed |  |  |  |  |
Deposits |  | 619,729 |  |  |
Other Liabilities |  | 70 |  |  |
Total liabilities assumed |  | 619,799 |  |  |
Total Fair Value of Identifiable Net Assets |  | (497,033) |  |  |
Goodwill |  | 20,478 |  |  |
Goodwill, Acquired During Period |  | $ 1,600 |  |  |
DCB Financial Corp [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 21,232 |  |  |  |
Consideration Received |  |  |  |  |
Cash received | 132,044 |  |  |  |
Total consideration received | 132,044 |  |  |  |
Fair Value of Assets Acquired |  |  |  |  |
Cash and cash equivalents | 24,420 |  |  |  |
Investment Securities | 88,986 |  |  |  |
FHLB Stock | 3,250 |  |  |  |
Loans | 383,083 |  |  |  |
Premises and other equipment | 12,113 |  |  |  |
Core deposit intangible | 5,998 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Real Estate Owned | 68 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank Owned Life Insurance | 20,522 |  |  |  |
Other assets | 16,450 |  |  |  |
Total assets acquired | 554,890 |  |  |  |
Fair Value of Liabilities Assumed |  |  |  |  |
Deposits | 484,366 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation | 7,851 |  |  |  |
Other Liabilities | 1,182 |  |  |  |
Total liabilities assumed | 493,399 |  |  |  |
Total Fair Value of Identifiable Net Assets | 61,491 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 110,812 |  |  |  |
Goodwill, Acquired During Period | $ 70,600 |  |  |  |

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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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