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Business Combinations and Divestitures - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 01, 2016 | Dec. 31, 2016 | Jun. 30, 2017
Liabilities assumed: |  |  |
Goodwill |  | $ 28,810 | $ 28,810
ColoEast Bankshares, Inc. |  |  |
Assets acquired: |  |  |
Cash and cash equivalents |  | 57,671 |
Securities |  | 161,693 |
Loans |  | 460,775 |
FHLB and Federal Reserve Bank stock |  | 550 |
Premises and equipment |  | 23,940 |
Other real estate owned |  | 2,962 |
Intangible assets |  | 7,238 |
Bank-owned life insurance |  | 6,400 |
Deferred income taxes |  | 4,441 |
Other assets |  | 10,022 |
Total Assets Acquired |  | 735,692 |
Liabilities assumed: |  |  |
Deposits |  | 652,952 |
Junior subordinated debentures |  | 7,728 |
Other liabilities |  | 6,784 |
Total liabilities |  | 667,464 |
Fair value of net assets acquired |  | 68,228 |
Cash paid | $ 70,000 | 70,000 |
Consideration transferred |  | 80,500 |
Goodwill |  | 12,272 |
Initial Values Recorded at Acquisition Date | ColoEast Bankshares, Inc. |  |  |
Assets acquired: |  |  |
Cash and cash equivalents | 57,671 |  |
Securities | 161,693 |  |
Loans | 460,775 |  |
FHLB and Federal Reserve Bank stock | 550 |  |
Premises and equipment | 23,940 |  |
Other real estate owned | 3,105 |  |
Intangible assets | 7,238 |  |
Bank-owned life insurance | 6,400 |  |
Deferred income taxes | 4,511 |  |
Other assets | 10,022 |  |
Total Assets Acquired | 735,905 |  |
Liabilities assumed: |  |  |
Deposits | 652,952 |  |
Junior subordinated debentures | 7,728 |  |
Other liabilities | 6,784 |  |
Total liabilities | 667,464 |  |
Fair value of net assets acquired | 68,441 |  |
Cash paid | 70,000 |  |
Consideration transferred | 80,500 |  |
Goodwill | 12,059 |  |
Measurement Period Adjustments | ColoEast Bankshares, Inc. |  |  |
Assets acquired: |  |  |
Other real estate owned |  | (143) |
Deferred income taxes |  | (70) |
Total Assets Acquired |  | (213) |
Liabilities assumed: |  |  |
Fair value of net assets acquired |  | (213) |
Goodwill |  | 213 |
Preferred Stock | ColoEast Bankshares, Inc. |  |  |
Liabilities assumed: |  |  |
TARP Preferred Stock assumed | 10,500 | $ 10,500 |
Preferred Stock | Initial Values Recorded at Acquisition Date | ColoEast Bankshares, Inc. |  |  |
Liabilities assumed: |  |  |
TARP Preferred Stock assumed | $ 10,500 |  |

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