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Business Combinations and Divestitures - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 08, 2018 | Jun. 02, 2018 | Dec. 09, 2017 | Oct. 06, 2017 | Aug. 01, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Consideration: |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 158,743,000 | $ 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 | 2,715,000 |  |  |  |  |  |  |
Total Assets Acquired | 669,902,000 |  |  |  |  |  |  |
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 | 66,658,000 |  |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |  |
Cash consideration transferred | 134,667,000 |  |  |  |  |  |  |
Goodwill | 68,009,000 |  |  |  |  |  |  |
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 | 3,118,000 |  |  |  |  |  |  |
Total Assets Acquired | 752,658,000 |  |  |  |  |  |  |
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 | 75,886,000 |  |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |  |
Cash consideration transferred | 147,961,000 |  |  |  |  |  |  |
Goodwill | $ 72,075,000 |  |  |  |  |  |  |
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 |  |  |  |
ColoEast Bankshares, Inc. |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 57,671,000 |  |
Securities |  |  |  |  |  | 161,693,000 |  |
Loans |  |  |  |  | $ 460,775,000 | 460,775,000 |  |
FHLB and Federal Reserve Bank stock |  |  |  |  |  | 550,000 |  |
Premises and equipment |  |  |  |  |  | 23,940,000 |  |
Other real estate owned |  |  |  |  |  | 2,962,000 |  |
Intangible assets |  |  |  |  |  | 7,238,000 |  |
Bank-owned life insurance |  |  |  |  |  | 6,400,000 |  |
Deferred income taxes |  |  |  |  |  | 4,441,000 |  |
Other assets |  |  |  |  |  | 10,022,000 |  |
Total Assets Acquired |  |  |  |  |  | 735,692,000 |  |
Liabilities assumed: |  |  |  |  |  |  |  |
Deposits |  |  |  |  |  | 652,952,000 |  |
Junior subordinated debentures |  |  |  |  |  | 7,728,000 |  |
Other liabilities |  |  |  |  |  | 6,784,000 |  |
Total liabilities |  |  |  |  |  | 667,464,000 |  |
Fair value of net assets acquired |  |  |  |  |  | 68,228,000 |  |
Consideration: |  |  |  |  |  |  |  |
Cash consideration transferred |  |  |  |  | 70,000,000 | 70,000,000 |  |
Consideration transferred |  |  |  |  |  | 80,500,000 |  |
Goodwill |  |  |  |  |  | 12,272,000 |  |
ColoEast Bankshares, Inc. | Initial Values Recorded at Acquisition Date |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 57,671,000 |  |  |
Securities |  |  |  |  | 161,693,000 |  |  |
Loans |  |  |  |  | 460,775,000 |  |  |
FHLB and Federal Reserve Bank stock |  |  |  |  | 550,000 |  |  |
Premises and equipment |  |  |  |  | 23,940,000 |  |  |
Other real estate owned |  |  |  |  | 3,105,000 |  |  |
Intangible assets |  |  |  |  | 7,238,000 |  |  |
Bank-owned life insurance |  |  |  |  | 6,400,000 |  |  |
Deferred income taxes |  |  |  |  | 4,511,000 |  |  |
Other assets |  |  |  |  | 10,022,000 |  |  |
Total Assets Acquired |  |  |  |  | 735,905,000 |  |  |
Liabilities assumed: |  |  |  |  |  |  |  |
Deposits |  |  |  |  | 652,952,000 |  |  |
Junior subordinated debentures |  |  |  |  | 7,728,000 |  |  |
Other liabilities |  |  |  |  | 6,784,000 |  |  |
Total liabilities |  |  |  |  | 667,464,000 |  |  |
Fair value of net assets acquired |  |  |  |  | 68,441,000 |  |  |
Consideration: |  |  |  |  |  |  |  |
Cash consideration transferred |  |  |  |  | 70,000,000 |  |  |
Consideration transferred |  |  |  |  | 80,500,000 |  |  |
Goodwill |  |  |  |  | 12,059,000 |  |  |
ColoEast Bankshares, Inc. | Measurement Period Adjustments |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |
Other real estate owned |  |  |  |  |  | (143,000) |  |
Deferred income taxes |  |  |  |  |  | (70,000) |  |
Total Assets Acquired |  |  |  |  |  | (213,000) |  |
Liabilities assumed: |  |  |  |  |  |  |  |
Fair value of net assets acquired |  |  |  |  |  | (213,000) |  |
Consideration: |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 213,000 |  |
ColoEast Bankshares, Inc. | Preferred Stock |  |  |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |  |
TARP Preferred Stock assumed |  |  |  |  | 10,500,000 | $ 10,500,000 |  |
ColoEast Bankshares, Inc. | Preferred Stock | Initial Values Recorded at Acquisition Date |  |  |  |  |  |  |  |
Consideration: |  |  |  |  |  |  |  |
TARP Preferred Stock assumed |  |  |  |  | $ 10,500,000 |  |  |

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