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Business Combinations and Divestitures - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) | Sep. 08, 2018 | Jun. 02, 2018 | Dec. 09, 2017 | Oct. 06, 2017 | Sep. 30, 2018 | Dec. 31, 2017
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Consideration: |  |  |  |  |  |
Goodwill |  |  |  |  | $ 158,728,000 | $ 44,126,000
FBD |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents | $ 151,973,000 |  |  |  |  |
Securities | 237,183,000 |  |  |  |  |
Loans held for sale | 1,238,000 |  |  |  |  |
Loans | 256,384,000 |  |  |  |  |
FHLB stock | 786,000 |  |  |  |  |
Premises and equipment | 7,495,000 |  |  |  |  |
Other real estate owned | 213,000 |  |  |  |  |
Intangible assets | 11,915,000 |  |  |  |  |
Other assets | 2,730,000 |  |  |  |  |
Total Assets Acquired | 669,917,000 |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits | 601,194,000 |  |  |  |  |
Federal Home Loan Bank advances | 737,000 |  |  |  |  |
Other liabilities | 1,313,000 |  |  |  |  |
Total liabilities | 603,244,000 |  |  |  |  |
Fair value of net assets acquired | 66,673,000 |  |  |  |  |
Consideration: |  |  |  |  |  |
Cash consideration transferred | 134,667,000 |  |  |  |  |
Goodwill | 67,994,000 |  |  |  |  |
SCC |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents | 14,299,000 |  |  |  |  |
Securities | 33,477,000 |  |  |  |  |
Loans | 31,454,000 |  |  |  |  |
FHLB stock | 129,000 |  |  |  |  |
Premises and equipment | 840,000 |  |  |  |  |
Intangible assets | 2,154,000 |  |  |  |  |
Other assets | 403,000 |  |  |  |  |
Total Assets Acquired | 82,756,000 |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits | 73,464,000 |  |  |  |  |
Other liabilities | 64,000 |  |  |  |  |
Total liabilities | 73,528,000 |  |  |  |  |
Fair value of net assets acquired | 9,228,000 |  |  |  |  |
Consideration: |  |  |  |  |  |
Cash consideration transferred | 13,294,000 |  |  |  |  |
Goodwill | 4,066,000 |  |  |  |  |
Total |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents | 166,272,000 |  |  |  |  |
Securities | 270,660,000 |  |  |  |  |
Loans held for sale | 1,238,000 |  |  |  |  |
Loans | 287,838,000 |  |  |  |  |
FHLB stock | 915,000 |  |  |  |  |
Premises and equipment | 8,335,000 |  |  |  |  |
Other real estate owned | 213,000 |  |  |  |  |
Intangible assets | 14,069,000 |  |  |  |  |
Other assets | 3,133,000 |  |  |  |  |
Total Assets Acquired | 752,673,000 |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits | 674,658,000 |  |  |  |  |
Federal Home Loan Bank advances | 737,000 |  |  |  |  |
Other liabilities | 1,377,000 |  |  |  |  |
Total liabilities | 676,772,000 |  |  |  |  |
Fair value of net assets acquired | 75,901,000 |  |  |  |  |
Consideration: |  |  |  |  |  |
Cash consideration transferred | 147,961,000 |  |  |  |  |
Goodwill | $ 72,060,000 |  |  |  |  |
Interstate Capital Corporation |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  | $ 75,000 |  |  |  |
Factored receivables |  | 131,017,000 |  |  |  |
Premises and equipment |  | 279,000 |  |  |  |
Intangible assets |  | 13,920,000 |  |  |  |
Other assets |  | 144,000 |  |  |  |
Total Assets Acquired |  | 145,435,000 |  |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits |  | 7,389,000 |  |  |  |
Other liabilities |  | 763,000 |  |  |  |
Total liabilities |  | 8,152,000 |  |  |  |
Fair value of net assets acquired |  | 137,283,000 |  |  |  |
Consideration: |  |  |  |  |  |
Cash consideration transferred |  | 160,258,000 |  |  |  |
Contingent consideration |  | 20,000,000 |  |  |  |
Consideration transferred |  | 180,258,000 |  |  |  |
Goodwill |  | $ 42,975,000 |  |  |  |
Valley Bancorp, Inc. |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 38,473,000 |  |  |
Securities |  |  | 97,687,000 |  |  |
Loans |  |  | 171,199,000 |  |  |
FHLB stock |  |  | 315,000 |  |  |
Premises and equipment |  |  | 6,238,000 |  |  |
Other real estate owned |  |  | 2,282,000 |  |  |
Intangible assets |  |  | 6,072,000 |  |  |
Bank-owned life insurance |  |  | 7,153,000 |  |  |
Other assets |  |  | 1,882,000 |  |  |
Total Assets Acquired |  |  | 331,301,000 |  |  |
Liabilities assumed: |  |  |  |  |  |
Deposits |  |  | 293,398,000 |  |  |
Junior subordinated debentures |  |  | 5,470,000 |  |  |
Other liabilities |  |  | 2,881,000 |  |  |
Total liabilities |  |  | 301,749,000 |  |  |
Fair value of net assets acquired |  |  | 29,552,000 |  |  |
Consideration: |  |  |  |  |  |
Consideration transferred |  |  | 40,075,000 |  |  |
Goodwill |  |  | $ 10,523,000 |  |  |
Independent Bank - Colorado Branches |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 1,611,000 |  |
Loans |  |  |  | 95,794,000 |  |
Premises and equipment |  |  |  | 7,524,000 |  |
Intangible assets |  |  |  | 3,255,000 |  |
Other assets |  |  |  | 1,644,000 |  |
Total Assets Acquired |  |  |  | 109,828,000 |  |
Liabilities assumed: |  |  |  |  |  |
Deposits |  |  |  | 160,702,000 |  |
Other liabilities |  |  |  | 249,000 |  |
Total liabilities |  |  |  | 160,951,000 |  |
Fair value of net assets acquired |  |  |  | (51,123,000) |  |
Consideration: |  |  |  |  |  |
Consideration transferred |  |  |  | 45,306,000 |  |
Goodwill |  |  |  | $ 5,817,000 |  |

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